Cadillac Misses at idle ,P0300 ,Northstar , With NO Coolant loss
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- Опубліковано 5 жов 2024
- If you have had to add coolant , then check for head gasket leak first . Cadillac Misses at idle ,P0300 ,Northstar This Cadillac DTS has a misfire only at idle . I hooked the scanner up and saw a p0300 code . The fuel trims seemed just a little high at idle but not over 10 . I looked at misfire counts to see which cylinders on this Cadillac DTS ,Northstar was missing . #1 cylinder on this Northstar engine was showing the misfires Any thing above idle the Cadillac ran fine so i started looking for a vacuum leak. What i found was the end of the pvc hose that hooks to intake was leaking.We also replaced the intake boot and intake gaskets . The boot is known to go bad so we just went ahead and changed it. If you find one bad vacuum hose be sure to check all the rest for they are probably just as old .
WTBM123
Car repair - Авто та транспорт
You said "thank you for watching", NO, THANK YOU, for taking the time to help us out, we really do appreciate it. It really helps us out. Thanks again. That is a lot of good information
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Absolutely a perfect video, just finished my '03 DeVille and it went extremely smooth. Both the "L" shaped vacuum boot and the Throttle body to Intake housing were badly torn. Thank You, Thank You, Thank You............The Caddy dealer here wanted over $600.00 to do the job.........parts cost just about $60. Complete in about 3 hours.
+Smagacz Farm Glad you got it fixed
Is there any video showing how to do it
7 years later this video is still worth the time watching😌👌
Thank you
Great video - thank you for saving me hundreds. Troubleshot and found boot between intake and manifold was torn. Three hours and $70 in parts and tools later my 05 Deville is running better then ever.
Glad it helped and thanks for watching
doggone, that was one fine walkthrough, top to bottom to top, no BS. Even if I didn't have to deal with a caddy, this was a clinic by itself on car repair. thank you and keep up the excellent work
I prob said this before but this video was SOOOOOO HELPFUL now my car is running alot better now just have to take it thru inspection now, great attention to detail. Once again I thank you for making an awesome video for the weekend mechanic.
Bro I swear to god, I fucking love you. I’ve went to mechanics, to countless Cadillac dealerships and they tried getting me to change my spark plugs twice, I did once. And then they suggested an upper engine cleaning which I did. I kept getting a misfire on cuclinder 5, and still am. I’m about to go see if my issue was a vacuum leak!!!!!! Ur a goddam genius!!
Also , does it leak any coolant , do you ever have to add coolant . Leaking head gasket is another thing that can cause a miss . But vacuum leaks are very common on them . Hope you get it sorted out
I love to see videos of people fixing a Northstar instead of bitching about how bad they are. I’ve own a 2001 Deville for 3 years now. It had 146k miles when I bought it. Now it has 161k miles.
A lot of people complain about those cars , but every car has issues , so one is just as good as the others . Thanks for watching and commenting
Excellent tutorial! That was quite impressive. I may never have to do it, but it's good to know the general ideas of how these modern machines break and can be fixed. Thanks much Terry.
Bruce Boschek Just a small leak can make one run bad any more.
Vacuum leaks can be so aggravating.
Nice to have a scanner with live data to watch things happen in realtime when you are testing your theories!
Velvethamma It sure helps to find direction .
It's 2022 and this video saved me brother. Thanks a ton. 😎🤙
Glad it helped!
This was an Excellent video. One of the best on UA-cam!!! You helped me out greatly!!! I have an 05 deville. Similar setup as your car here. I too was getting the same code reading of misfiring and running rough. The rough running was due to the crankcase ventilation tube with that little rubber elbow that goes into the intake manifold behind the power steering pump like I saw in your video here. It was completely broken off which is why it was running so badly. I also replaced all 8 spark plugs with new ACdelco iranium plugs which solved the misfiring code. They were the original plugs since new. My car runs perfectly now. No problems whatsoever. Thanks again
+AMCNorthstar 93 Glad you got it running good again
OMG you did that entire video with one hand... you got skilz my friend. Love the use of the magnet.
The hard part is i find my self trying to do things looking through the view finder.
@@wtbm123 dude I can’t imagine 😂
Very complete sequence of diagnostic and repair Terry,
Nice job with the narration of the process too. Really liking these scanner videos, great job brother !
lakesideranch Thanks Doug
Thank you for taking the time to make this video, very helpful.
This video is on point. Had same issue and rubber elbow at PCV valve was dry rotted and crack in the fwd coil pack. Saved me a bunch of money to DIY. :-)
Thanks for stopping by . Glad you got it going again
How much were the parts total rings gaskets rubber connectors etc all would be appreciated
@@adriantrevino1122 You can get the whole coil pack assembly with 4 coil packs on it for around $150 to $200 "online". The PCV valve is like 15 bucks at AutoZone. My Cadillac sat for over a year after changing the coil packs it was still misfiring and then come to find out it was the PCV valve.
Great video. I'm about to replace all the vacuum elbows and throttle boot on my daughter's Cadillac DeVille Concours. I'll give you a tip my father would do and I learned it from him. On the elbows in hard to get to areas he would wrap the elbow with electrical tape and I promise you it helps protect the elbow from damage.
Also keep in mind if one of these engines are using coolant that kinda changes the game , as that can also cause a misfire . I prob should of said more about that in video.
@@wtbm123 how does using coolant cause a misfire. School me. Thank you
@@Tom-wq2mz Those engines are known for head gaskets , So if leaking into a cylinder it can cause a miss . If you are leaking coolant i would look into that first . Some when shut off hot , the pressure in cooling system will push coolant in cylinder . then will miss a lot next time started . If using much coolant , sometimes can look at spark plugs and tell witch cylinder . Some the threads in the block let go and let head bolt loosen up . If threads in block is bad , they make inserts to fix the holes . So if they come in and customer is adding coolant , i start looking for a bad head gasket . May be able to pressure test the coolant system .
@@wtbm123 Yes I'm aware of the notorious Northstar 4.6 head's and bolt's backing out creating a leak. I wasn't sure what you meant when you coolant can cause a misfire. I bought the car with 146K and I'm sure it needs a complete tune up. But I'll do a compression test and read the plugs when I pull them out. Thank you for your feedback.
Excellent video! A little scary, but watching you do It makes it much less fearsome.
+Leon De Vose, II Thank you for watching and commenting
Thanks Wilber Bear, it's not such a hard job to do after watching you replace those intake manifold gaskets. I should be able to do it in a couple of hours.-Your a great mechanic !😊
Thank you , and it is not to hard of a job . I am sure you can handle it
Well done, if i had the time and a younger back, i'd do this myself. Gonna eventually have mechanic fix vacuum leak fixed in my northstar.
Thanks for watching and commenting
Same for the ls123 the pvc grommet gets old, but gm wants 250$ for the line but i found vw spark plug wire grommet on the dis side works well. Thanks for the vid
Will have to remember that , I found both ends on the help shelf . . Thanks for watching and commenting
While you have the intake off it;s a good idea to check your battery connection to the starter solenoid, they are know to loosen up overtime. On my cad. the nut was completely off which caused the starter to malfunction.
It is a pain to get to starter , so good idea to check everything
Thank you, because of your information I will be able to communicate with my mechanic when he helps me with my 2002 Cadillac DTS idle misfire.. Well done youtube video!
+Kim Coburn Thanks for watching and commenting
Excellent video! Very clear instructions!
Thanks
I'll bet there are thousands of caddy's out there with 8 new coils and their 2nd or 3rd set of plugs chasing this vacuum leak misfire
This and also a misfire from a leaky head gasket
That was about to be me but oh my lord who thought of plastic lines for the emissions system, im changing those to rubber tomorrow, if I remember I’ll update y’all how it goes for your future endeavors!
Just got done putting new plugs.All the back kohl's relaced found that pvc hose, replaced it now onto fuil pressure regulator
I bet you're right
Thanks for this video... I checked that first hose you found a leak on... and mine was completely broken off, dealer wanted $1300 to fix full intake gasket, hope this is the only one, but it's a start!
Jesus 1300? For a couple of like 25 dollar gaskets and an hour MAYBE two hours of shop time?
They were prolly scared of the northstar and overcharged so they didnt have to work on it
Oh that snapon scanner really pays for itself, it displays the data in an almost analog way, really appealing.
Smashing repair :-)), it didnt take you long to find the culpret and you covered the known trouble spots as well, lucky customer :D
I do like me scanner , I was suprised to see the boot in that good of shape.
wtbm123
I suppose there is allways one that escapes "crackidge", but you had one ready :-))
No insurance dongle in the obd2 socket this time lol.
zx8401ztv LOL i Amazing how fast they knew it was unplugged .
wtbm123
I really really hate the sound of that idea, lets hope that it fails over time, bloody insurance companys are scam artists, and they are all the same no matter where you live on this planet :-((
Thanks for sharing
Thanks for watching!
I had the exact same problem with my Cadillac Deville and followed this procedure and replaced it myself with complete cure of the issue. However I did not disconnect the wiring to the injectors I was able to do that and keep the wiring in-tact.
Great video
I will check my vaccum lines
Surging, mis fire at ldle
Hope you get it all sorted out.
Starter under the intake....lol. Those seem like a chore to work on. I know my 97 was....
Not the worst engine to work on , but there are easier ones.
wtbm123 I guarantee mine would be the hardest to work on lol. Its getting worse and no idea nor does anyone around here know what is wrong
I liked this video. Easy to follow.
Thanks
Damn, I'm so confused. I have a 2004 Cadillac Deville and just got code p0300, so I bought all 8 coils and spark plug, and I'm about to change it this weekend, but after seeing your video I'm hoping it's not something else.
They do have some vacuum leak issues , but one thing i should of stated clearly in the video , If you are using any coolant , having to add any and do not see any leaks , then suspect a head gasket . so if using any coolant do a block test or can look at spark plugs for signs of coolant , usually a real clean plug or may have some white crusties on it
I got same problem.smh
This is awesome. Thanks so much! However, I wonder if one can remove the intake and fuel rail as one unit rather than remove the rail and injectors first. It would make for a much easier removal/reinstall I'd think. I did it with my 1996 when I replaced the starter motor.
One prob could but i had new o rings for injectors so i wanted to install them too
Thanks for sharing this stuff WTBM, wealth of knowledge and a good voice to keep folks attention. Have a good'n
Thank you for watching and commenting.
I had a Misfire with my 2005 DTS it felt I was running on 4 cylinders. I am a person that's not handy with tools I brought the car in to my mechanic and fix the problem. The total cost of that repair was$1,240.00.
Thanks for watching and commenting
Great video for all the detailed points. right on the problem. my Cad has the exact the same problem, the rubber boot at turn broke. My thinking: instead of going thru all these dissembling and removal of lines, if I could just somehow remove the left over rubber boot, and wrap with some sort of fabric and drip epoxy glue to seal the joint. all these effort of removing stuff is to reach this bent joint anyway. I know the space is tight in there, you would need a lot of patience to do surgery type operation...
It may be possible to replace the elbow with out much dissambly
I learned a lot by watching your video. Thanks for sharing.
Very common a vacuum leak will shot a misfire code. Same with a carburetor it will miss.
Thanks for watching and commenting
Very helpful, appreciate the video. Was thorough in the walk through process. Was able to fix my p0300 on my gxp
Thanks for watching and commenting
Dude best video ever thank you so much
Thanks for watching and commenting
I found it interesting and I don't even own a Cadillac..... but I have had a vacuum leak.
snocrushr I am sorry that u have a vacuum leak . If you do not have a obd2 port i can not help , but might try a smoke machine.
Nice work WTBM123 Thanks.
Thank you too!
YOU ARE THE F*ING MAN BRO!!! KEEP MAKING VIDEOS.After replacing the brake booster & hose of course, lmao thanks.... god bless.
Nice - so the elbow was not the leak it was the intake gasket . Prying with the screwdriver was applying pressure to the bad intake gasket.
The elbow was the issue . not sure if intake was actually leaking but the one gasket looked different than the others . Prying with screw driver was bending the elbow and closing off the small hole. The intake boot was cheap and fairly easy to change , so because they are known to have issues ,and this is a hi millage car we decided to change it too.
My work truck has the same code and same problem. Comes and goes. Bet I have a similar issue.
You could borrow that scan tool again and let us see fuel trims and stuff . Also leaving the battery hooked up or not clearing codes is nice . Lets you see freeze frame data to see what was going on when check engine light first came on Most vacuum leaks ,long term fuel trim will start correcting back when revved up..
4 oxygen sensors and a set of plugs fixed it for now....
Sounds like a vacuum leak..and bam you said it...lol...Pull a valve out of a tyre somewhere and stuff it in the fuel line..Good vid mate
The tire valve cap i tried was smaller .
sonofabitch.!
Great vid! GReat walk threw on the how to for the do it your selfer.
Thank you
I have the opportunity to buy a 2000 SLS in fabulous condition for 1000 dollars , it has a misfire but no codes , man I hope this is the problem , great video , thanks
+Michael Proulx Hope it is a easy fix .also Look for signs of coolant leak . as this can cause a miss if getting coolant into a cylinder
nice fix, squirrels are complaining they have no room for storage anymore.lol
finpainter1 LOL Thanks for watching Stu
THANK YOU I FINALLY FOUND THE VID IVE BEEN LOOKING FOR
Thank you . But also if you are loosing any coolant , these are also known for head gasket issues . Hope you got yours fixed up.
Thank you thats alot of info l need. Have a great week
Very good and easy to follow, and you did a very thorough job, and good
clear explanation here. I have to replace the intake coupling ( rubber boot)
as well in my 2001 Olds Aurora, which has a Northstar Engine in it as well,
it's just a little bit smaller than the Cadillac engine. Looks like a complex
job, and I'll need an expert mechanic like you to do it. Right now my car
will buck while coming to a stop, and I get mild engine surges, causing the
engine's idle to race up a bit. It's likely the intake plenum ( boot) or idle air
control valve by speaking with other Aurora owners. All Northstar Engines.
As a mechanic, do you think DEXCOOL coolant is OK for these Northstar
Engines ? as I heard the Dexcool can deteriorate the rubber or nylon gaskets.
I'm thinking of draining the system, and going with a different type of coolant,
but some people have a great experience with DEXCOOL and others not. I'm
a little confused on this issue, and would love your opinion on it. I've read that
the DEXCOOL in lower end models of GM can deteriorate the head gaskets,
and this cause a leak. My car does leak a bit of Coolant, maybe 1/4 pint in a
year. I was thinking it's from the water pump, and can see the coolant in the
snow. Would really like your opinion of this DEXCOOL coolant -- good or bad ?
I guess if the leak is showing up in the snow, then it's not likely getting into
the cylinder -- right ?? What do you think, and what's causing these head gasket
leaks ? -- it had to be inferior gaskets, that cannot handle the acidic content in
the DEXCOOL . Not sure what to think. I will say that in my old 1997 Lumina, I
drained out all the DEXCOOL, and refilled with standard green coolant about 3
years ago, and no problems. My sister's 97 Lumina had head gasket leaks, and
seized 2 motors, that costed her a fortune to rebuild.
Great video BTW, and very educational.
If leaking any coolant , i would check to see where leaking . These engines are known for bad head gaskets . Nothing wrong with DEXCOOL if maintained correctly . Most issues i see is from people that do not regularly change the coolant . Then electrolysis starts to happen . Some of the head gasket issues on those are from the head bolt, coming out of the aluminum block , That is why the thread repair kits just for them are made .
@@wtbm123 Yes I believe a place up in
Canada sells these redesigned bolts, and
I've talked to the guy, and he supplies a
lot of US machine shops with these kits. I
believe his business is called the following
and it's Northstar Performance, if my
memory serves me correctly. I also have
talked to lots of guys that have nearly 200
thousand miles on their cars, ( Auroras)
with no head bolt issues, so I guess you
have to be a little lucky.
Not a small job, but you got it done!
***** Thanks for watching
Thank you so much for making this video you were so clear and understandable please keep it up
You're very welcome!
Good repair Terry. That SnapOn diagnostic tool sure makes things less of a guessing game!
While it's torn apart I? wonder if it's a good idea to throw a new starter in there. What a crazy place to put a starter.
If a quality starter maybe , but a cheap one may not be as good as the original one , so hard to say
I know it’s a old video. But how come you didn’t have your short term fuel trim data opened and graphed. Also using propane or brake cleaner to find the leak while watching the fuel trims change.
I would have to go back and look .
great video, very well explained, will help a lot of people no doubt
Thanks
In the service manual there is a referrance ,in the electrical section, there a 3 initial given all I want to know is what CKT means
Thanks a lot what a good video I’ll try to do it myself
One other thing to watch for is if you have had to add any coolant . If having to add coolant test for bad head gasket . If no coolant leak then it could be a vacuum leak . both are common on these
@@wtbm123 thanks for your knowledge’ I got a 2005 northstar!
Good job. BOSS Man
Thanks!
You might have a weak fuel pressure regulator
nice fix...ty for showing
Thanks
Excellent video Terry
grat, THX for share with us... Question: What kind of diagnostic toll you habe?
Informative but it's way easier to remove the Power Steering Pump to access the line if that's the only thing you're replacing
Yes if only doing the elbow . but not if replacing the intake boot .
wtbm123 could you not have removed the power steering pump instead of the manifold? I've got something like that happening on a customers car. The cover on the engine was covered with mice crap, I'm thinking the hose(s) might be chewed too. I just had a quick look at it outside, but it's -10 out there, and it wouldn't start, battery low, but I'll bet thats the problem. Thanks wtbm123
What's the part number for the hose at 1:20 that you were pointing at? I need to get one as mine has broken at the elbow joint.
+Gilbert Nichols for the whole pvc hose the gm part number is #12573068 , but i just took the rubber elbow off and took to parts store and matched one up, i do not remember the part number , they are usually hanging up somewhere in store
In Denver the only auto parts store to carry the elbow was Napa. That elbow is not available at advance auto parts ,O’Reilly auto parts, or AutoZone. I replaced the elbow in 2020. It’s 2020 June 22 and I replaced the boot on the end of the intake manifold that connects to the throttle body. I got the three bolts tightened up wonky, not Flush, and I have a gap where I can see one of the pins lower front so there’s a gap between 2 aluminum brackets. Worse than that I burned up the brakes driving 10 miles no 6 miles with the throttle position sensor stuck on the highest setting. I had to turn the car off at stoplights to keep from crashing into the cars ahead. Then it was hard to start the car. I left home, drove a few miles and the car died at a stoplight the idle dropped from 750 to 250 100 zero. After fluttering the accelerator I got the car started and got it into gear but it stayed at 3850 RPMs. I had to use the brakes to drive. It was horrible. At the end of 6 miles smoke was coming out from the brakes. I couldn’t even stop the car to pull into the driveway. So I turn the car off with both feet on the brakes. After talking to a mechanic who suggested that the throttlebody might be misaligned I took a visual look at the connection to the right of the new boot and discovered that one of the alignment pins lower front was showing which means that the whole throttle body is misaligned to the right of the stationary bracket mounted to the engine. The boot to the left does not seem to be the problem. But I’m getting an error code P0101 for mass airflow sensor and throttle position sensor P0121. Previously the only check engine light was the error code P0405 exhaust gas recirculation position sensor circuit. So now I am stranded on June 23, 20202 1/2 to get tools to reposition the throttlebody to the intake manifold. I don’t know if the throttle position sensor has slipped out of place or what the hell is going on. Further note when I put everything back together I forgot to tighten the 8 mm hose clamp on the air intake where it connects to the aluminum throttle body housing. Then I discovered that the hose clamp around the mass airflow sensor had been loose the entire time I’ve owned the car since Christmas 2018. At least the throttle position sensor was not a problem with the loose air intake. Oh and I put the cover over the top of the engine that I had removed because it trapped heat and rotted out that rubber elbow by the power steering pump. Here in Denver we have very little rain. Driving in snow with red roads a lot of road grit could get loaded up on the intake manifold on the plastic body where the fuel injectors poke through. That was the reason for putting the cover back on. The cover is to help keep dirt away from the fuel injector holes in the plastic intake manifold sometimes called a Plenum. Well that steel plate on the rubber boot to all the right of the intake manifold seems to be the source of the rubber cracking. It seems to be a terrible design. I got the dorman boot and blue gaskets. The gaskets would not stay in the grooves. The gaskets kept popping out so I knew there was no way the gaskets would work. So I reused the old gaskets. The Felpro fuel injector O-rings did not include the little plastic rings at the bottom of the fuel injector that keep the spacing of the O-ring proper. So that was a complete waste of money buying Fel-Pro O-rings. Sure the old O-rings were somewhat hard from heat. Really the biggest problem was the rubber boot with a crack going halfway around that could not be seen till it was removed. Now I’ve got these other issues. I’m wondering is there a gasket between the two metal aluminum brackets of the throttle body? I have FIXD to view the check engine light codes. The dash light does not disappear after resetting the code right away. So I thought I had the vehicle fixed and the light will go off after 25 miles. There’s got to be a better way to test my work and be sure that the check engine light is not on. I really got hosed driving across Denver and now I’m stranded with no tools. I hate to tow it to the dealer and pay $1000 ransom. So the order of the day is to re-tighten the bracket on the boot to the aluminum throttle body and get the spacing proper.
I had p0302 on my 97 Seville and had the tune up not to long so I was curious why I had misfire but it ended up being my coil pack on 2&5
Was it an intermittent misfire condition? I've got an intermittent misfire on my 2000 Cadillac Deville Northstar engine, code P0303 (cylinder 3 misfire code). Could my problem be a bad coil pack on that (rear, firewall)
bank, as well? Can the coil misfire on a given cylinder be intermittent? Thanks.
Than’ u very help full
Thank you for watching and commenting
hi.. I have somewhat the same problem .. in order to replace the little rubber hose at the passenger side of the intake how can I do this without having to take down the manifold?
Don't overlook somethings simple & basic! Had test done on my '96 Deville, showed PO300 random misfire but did not show which cylinder...computer printout specified the map sensor, but l decided to do some troubleshooting on my own and found trouble to be #3 plug + corresponding coil-pack! My eyesight isn't what it used to be, but probably saved my shrinking account several hundred $$!
Thank you for commenting . This comment may help another out at some time
Thank you
Thanks very much for posting this video. I spent $110.00 on diagnostics fees and was told replacing my plugs was the fix. Did that at home and still having rough/misfiring (only during idling). All instructions you provided seems "doable" with the exception of that "special" too used to remove the fuel lines. What are they called and where can I find what looks to be like a set?
fitzalbert Gordon A line disconnect tool . most any parts store should have them
Thanks again.. found it...I drained the fuel from the injector line.....must I fill it back with fuel before Installation?
fitzalbert Gordon Just reconnect the lines and cycle the key on and off a few times . always be sure to check for leaks , just in case
wow!! very helpful!! great video!! Do you have to remove the manifold and fuel rail to replace the engine wire harness or can you get around that????
I would have to look at it again to say
How do you change spark plugs on a Northstar v8 se V series engine I can't find anything on UA-cam
Robert Vee you need to remove the coil packs . they are over top the valve cover , one is silver other is black . the plugs are under them .
Its a 2006 STS supercharged V engine the Corvette engine it has a supercharger on top
@@robertvee2173 That's not any version of the LS, that's the LH2.
The STS-V never had a Vette engine.
Provided this is 4 years later, but wanted to clear that up.
I have 97 Deville 4.6 northstar how to change cross over water pump housing seal please note not water pump seal thanks need help badly .
johntaheri The water crossover on the 97 Deville is the same from 1993-1999. I know you have to remove a lot around it but it can be done. I think I saw a video somewhere on youtube. Let me know if you were able to find it. Im curious as well.
ok sure I let you know
johntaheri I don't know if you saw but someone on youtube did this job for a 2006 Cadillac DTS. He has two videos for this. I know that the engine is slightly different but the procedure should be similar. Check it out if you didn't. I haven't seen any videos yet for the 1993-1999 Cadillac Northstar yet. Let me know how it goes....
awesome vid. super informative
I got a question, how do you take off the PCV valve on a 2004 Cadillac Seville?
cool vids. I'm not a full timer, how do you feel about the harbor freight scanners?
Depends on how involved you want to get. They have a Autel Maxdas ,for around $1,100 i, but it has bi directional controls , which can be helpful and can get into most places like body controls,trans, abs ,air bags and stuff. The mid range one should show live data ,but not much else, and prob not anything but engine data. . Then there are code readers that only give codes. It all depends on how much info you want to have.
Very informative video
Thanks for watching and commenting
Thanks for posting. I too have the rough idol. P0300. 2005 DeVille. Parts store told me it was the #3 fuel injector. Glad I read this before replacement. I noticed that a few weeks prior to having the rough idol & the code, I went through a small puddle coming out of a shopping center and I lost my power steering for a few seconds. My tires were turned and I was going down the driveway into the puddle. Question: Could this have something to do with that? Thanks wtbm!
prob got PS belt wet . and also keep in mind if you are needing to add coolant , not sure if you are , but if needing to regularly add coolant , then suspect head gasket , if misfire occurs and all else checks out to be ok
Where do you live at and what is your HG on the Baro?
higher 29 s , Fixing the vacuum leak fixed the issue , The PVC hose leaking is common on these . the intake boot was not leaking on this one but is also a common issue . Thanks for watching and commenting
You said find a tool like this what kind of tool was it
Great info..CJ
Thanks CJ
I have a 2005 Cadillac DeVille. It had a very bad misfire on which I started with the spark plugs, nothing changed. Then I change the front full coil pack assembly, with the front 4 coil packs. It seemed to have worked ,but then after about four or five days the misfire came back. Come to find out the PCV valve was dry-rotted and just hanging off. I replaced that and then it was running perfect. Now it is starting to slowly misfire again after few days. I've heard it can possibly be the fuel injectors. To whom this may concern, if anyone can help me with some tips I would highly appreciate it as I have been spending a lot of time and money.
Is it loosing any coolant . If so It may be first signs of head gasket . Also check the rubber boot at intake to throttle housing . The bottoms like to get holes in in them .
had same problem changed spark plugs and wires ,continued then got a code for cylinder 7 miss fire ,tested coils and # 7 had way off resistance ,so changed that one and o more miss fires"".. 1996 eldorado'
+francisco villa Cool
My 2003 has a knocking noise after a few minutes after starting and it doesn't want to take off at a stopping point and the motor shakes a little bit can you tell me what it is
Knocking noise could be internal problem Are you losing coolant . Check spark and for coolant in cylinder
A deathstar... The head bolts still OEM on that one? Good engine other than the design faults.
I may be wrong ,but i think they redesigned the engine for 2002 + and from that point on i think that head bolt thing was fixed.
Not wrong, They added inserts to the block in '02 but I've still seen a bunch of them fail. They should have used the same thing they had on the race version of the block. On those they had deeper bosses for the bolts and inserts were cast into those bosses.
Liked the missing T-Blazer vid. That air box looked a bit beat, Wonder if it was dropped at some point.
***** Not sure about the air box. At first i thought someone tried to spray foam it but it was hard like epoxy . It did look like it had taken a beating at some point . It is interesting what one finds sometimes.
Does the p0300 mean that's the problem for sure?mine has it and I was thinking about changing the coil packs
P0300 is random misfire . It means a misfire detected , but not enough counts on any one cylinder to get a misfire code for the one cylinder . If no vacuum leaks , my next question would be have you had to add any coolant . Those are also known for bad head gaskets . If have had to add any coolant i would check for coolant in the cylinders . A lot of times that spark plug will look real clean
Getting my as* kicked by a P0300 on a 2004 Cadillac Northstar with 90K and am working on it for a friend (no $!). Many hours, tests, and supposed fixes and I still get the code. Cold starts shake a lot and then calm down in 30-seconds or so. But you can still feel/hear intermittent misfires. Just wondering if you could recommend a reasonably priced scanner that can detect misfire counts by cylinder and fuel trim? Has new coil overs, plugs, and passed smoke test. Noid-tested injectors. Cat not smelly, but on my cheapy Ancel OBD2 I'm getting both banks OL Fuel Faults. Have not checked O2 sensors yet.
But, had an ex-Cadillac mechanic by yesterday and he phoned a current Caddy Master Tech. Don't know how but they believe it is a failing (or failed?) head gasket(s)? Should I do an antifreeze fluid color test?
Could be a head gasket , May try and do a pressure test on cooling system . A lot of times when you shut it off the pressurized coolant finds its way into a cylinder . Then it misses more on that cylinder for a bit then seems a little better as it warms up. Have you had any coolant loss . . If enough coolant has went through a cylinder a lot of times it will make that spark plug look different than the others . Some times to fix the head gasket the threaded holes in block will need fixed .
awesome
Thanks for stopping by
An excellent, well filmed and well explained video! Thank you! I have 2000 Cadillac Deville, that is giving me a code P0300, as yours was, plus these two manufacturer specific codes that seem to point toward both ignition coil packs, P1359 and P1360, but I'm not sure that is what the problem is, as I just replaced both coils about 2 years ago, and I don't expect them to be bad this soon. Any suggestions, appreciated. It is misfiring at idle and while running under a load.
Another common issue on these is coolant loss , if you are loosing any coolant , it could be a head gasket , if no coolant loss then check for vacuum leaks
@@wtbm123 I just found out what the problem was, in my case. The back coil electric harness had slightly jiggled off of the coil, and was not making contact with it. The plastic lock to the connector was broken and the wiring harness connector slipped off. I pushed it back in, and all back 4 cylinders and coil pack began working again! Whew! That was a simple fix! Thanks! It's interesting that it threw all three listed codes at me, though, that I mentioned in my last comment, above.
i have an 2004 deville same with an idle problem only at a stand still point driving it runs great which one of these do you it is .....
Chris Salinas i got the same problem .. so did you found what it was ? Mine is idling very low when i start it and i cant find what it is .. would be very helpful if you can tell me thx
Can a hole on the rubber boots between intake and throttle body cause the miss
yes
What do you think I should do to fix a smoking problem at the exhaust. The company that changed my oil left the motor 2 quarts low, after 40 miles it started smoking.
Cadillac DTS w 4.6 L 2006
Not sure .But please let us know what the cause is when you get it sorted out . It may help others . Thanks
I have a 96 Cadillac Saville STS 150,000 it's not miss-fireing but it doesn't idle perfectly but its not to bad. I believe it could get much better gas mileage. It reads that it needs engine service and it reads the transmission needs servicing. So if i give it a 150,000 Mile tune-up, can you please tell me what all parts will i need? I had a computer diagnosis done and said i need to replace a intake manifold gasket. Should i go ahead and replace all the gaskets and the entire manafoldp?
the intake gaskets and the boot by throttle body usually . and look good at pvc hose
o2 sensor dont show in the code, im gonna order one, because it runs fine until it warms up,,, no coolant loss,,,,,, have any data how to replace back glass with faux top? i can"t find it,,, thank you
+yank mcruff Yea with out scan data hard to really say what it is . Codes are set when a sensor reads out of its parameters , but but can also can be close to setting a code , but not set one . A code is a clue , a set code is a direction to look , not always the bad part or the cause , but the part reporting out of its parameters
What snap On tool are you using to monitor the engine performance ?
Thanks