Chevy 3.8L Upper + Lower Intake Manifold Gasket and Tensioner Replacement Part 3
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- Опубліковано 5 вер 2024
- Here is how to remove and replace the upper and lower intake manifolds and gaskets on a 2005 chevy monte carlo with a 3.8L engine. This procedure should be the same for any GM made vehicle with the 3.8L 3800 series engine like the Buick Lesabre, Chevy Impala etc.
I have a 1999 Chevy Monte Carlo Z34 with the 3800. I have exactly the same fluid leak and nobody including some friends that are quite good mechanics could figure it out. YOU DID!
Thanks so much for the very detailed, clear and unshaky video. I am a film producer for the Motorsports industry and think you did a great job. Thank you very much.
Scott
Just watched all 3 parts. Great video! You made it look fairly easy to complete this task. I myself am looking to do this repair in the future and you helped me out a great deal. Thanks!
That is not the way to install thermostat seal. The seal goes around the thermostat inside a groove that is in the seal.
I'm not a mechanic but I know this lol
Excellent video series. I have three of these engines in our family fleet. No leaks so far, but I know it's coming. Your videos have great detail and clear shots of all the work. I feel confident I could tackle this myself now. Thank you!
Of the other videos on here, I did find yours the most helpful! I keep watching them before I do my LIM. Very detailed and I like how you showed where everything goes. Great videos!
I was intimidated by this job until I watched your very informative video now I'm excited to tackle this on my own
Good overall explanation. The Buick appreciates you and so do I.
Greg Wilson hah good to hear. cheers
Thanks so much for making. this. I was debating whether to pay a shop or do this myself, and after watching your excellent video decided I can tackle this myself.
Peter Arthur Martin Nice, hope it goes well. Take your time and you should be ok. GL
Thank you for this video. I bought a new lower intake as well and it didn't fit. As like yours the holes didn't line up. It was a Dorman also.
This three part series you have put together is outstanding!
I have a 2001 Buick Lesabre 3.8L 3800... And I had issues from the get go when trying to work on the engine.
In a twisted way, you having to do the job again made me feel so much better... Lol!
No offense, it's just that I find myself turning into a sailor because everything I have touched went wrong.
I'm a beginner, but with the help of your videos, I am confident I can conquer this engine.
DPP
Yes u can very much conquer that engine. It's not that hard once used to.it an learn what's needed. Buying a Haynes manual for $25 or so is a lifesaver! Shows step by step instructions on how to change anything on them motors, just buy the right 1 for your yr of car. Goodluck
At least he knows his wrecking yard really good
Excellent series of repairs! Thanks brother!
Thsnk you for the "heads up" on that Dorman lower intake manifold.
I believe the 3800 Series 2 started in 1995. I was surprised at how many GM cars they ARE in.
Thank you for these videos on this subject. I'm hoping I don't have to do the lower intake manifold however we shall see......
nice job dude! a couple of days ago i took my upper intake manifold off to clean it and it needed it and at the same time i cleaned my throttle body, air filter and my mass air flow sensor and it made a difference in doing that. I was starting to clean my lower intake but decided not to and it needed it but I think it will be ok. I really want to get me a performance lower intake manifold for more performance that way my after market intake air filter can benefit, but overall very good video!
Man, saw that milky dip stick palm my face like dang all that hard work and now you have to take all that apart. I would've been in foul language mode after seeing that.
You're the man!! I made the mistake of buying the plastic gasket which is a piece of shit. Now I have a friend who has a 2000 century who needs the same thing done. It's not that simple on that motor (3100 series) you have to loosen the rocker arms to remove the lower intake manifold gasket. I hate that motor design. Once again thanks for saving me almost a thousand dollars in labor 🤑😁🇺🇸.
It's so helpful when you point out the size socket you are using. Also which way do the wiring connectors go on too. I'm struggling with the coolant sensor. I don't know which way it goes on and I'm afraid breaking it. Two second job turns into an hour cause I have no idea. Thanks
Very very great videos I have a 02 chevy impala and have to do this project myself real soon I like to watch videos and get as much knowledge as I can before projects and this video was absolutely perfect thanks for all the advice your a very smart mechanic!
Hey no problem, glad you found it useful. GL with the project. cheers
I glad your telling us not to buy the doorman intake
Great videos my friend. After watching all 3 of your vids, I now have hope. I plan to watch all 3 vids again before I attempt to do mines. I have an oil leak that is finding it's way into my radiator & reservoir causing my 2002 monte carlo ss to overheat badly. My radiator & reservoir has brown milky substance in it. The strange thing is the coolant does not appear to be going into my engine oil. When I pull out the dip stick to check the oil, my engine oil is clean & clear. I know for a fact it's not transmission fluid in the radiator so I have ruled that out. I had some people tell me they do not know what's causing this. Some have told me I have a crack engine block. Anyway, thanks again for the videos.
+305Navi Cracked engine block is possible, but you need to check your engine oil cooler for sure, its the only other area where pressurized engine oil and coolant are next to each other and if there's a crack only engine oil leaks to the coolant side because engine oil is under alot more pressure. Besides that it could be trans oil leaking into coolant in the radiator which you have ruled out. GL
+RatchetsAnd Wrenches
Thx for the reply.
I was told that my vehicle does not have an engine oil cooler.
@@305Navi I had my transmission fluid cooler(inside radiator) break an ended up with antifreeze tranny fluid mix in motor and tranny! Got lucky an it didnt hurt anything after a good flush an new fluids. Boy I was lucky. But on my old car I also had same prob, oil mixed with antifreeze but not antifreeze in the oil. It was my lower intake. It all depends on where the gasket breaks at also etc. Goodluck
nice video but if you would have left thermostat housing on and removed the hose you can use it as a handle
That was a ton of help, thanks a lot!
Excellent video, lots of tips and that will help me to do the same thing on my car. Thanks again and keep posting these wonderful helpful videos.
I just wanted to thank you so much for making this video, I'm not scared to tackle a job but watching someone perform the job first sure does help. I have watched all three video at least half dozen times and now think I can tackle it myself. I'm going to take a lot of pictures and drawings of every thing I do. I do have a question though what is 89 inch pounds. I know what foot lbs are but do not understand inch pounds. Thank you so much... Big thumbs up from me and I subscribed...
Hey another very helpful thing is a Haynes manual for your car. It shows and gives step by step instructions on how to change anything to do with these motors. Has some pics when needed also. For $25 at autozone etc. Along with the vid you can def do it. Hopefully it's fixed an still going. They run forever if taken care of an get them stock junk gaskets off. An buy the good upgraded gaskets an you'll never have to worry again. Gl
Quick question...how can I torque the bolts to 89 inch lbs if I don't have access to a inch lb torque wrench and my ft lb torque wrench only goes as low as 10 ft lbs but I think the conversion would put 89 inch lbs at around 7.4 ft lbs
Brother, such a great video!!! That’s too bad that happened to you.
I have a 2003 Chevy Impala v6 3.8L that idles at 2,000RPM and basically steps on it's own gas when I drive. I watched this video because you do a very good job of explaining the parts. What is the vacuum hose that is hooked up to the throttle body and the fuel pressure regulator also hooked up to? In checking mine, I broke the hose (it was pretty brittle). I need to get a replacement, but don't know where to find one. Kind of new on car repair.
Ya car idling that high is definitely a vacuum leak, giving the motor more air, which in turn makes it about like your pushing the gas pedal a little. Junkyards usually have alot of parts if you look around hard enough u should find what ya need. Hope ya did. Gl
I know exactly what part your talking about also, as I've changed a few of these intakes myself yrs ago and just now actually. But man I don't know specific name of the part. I'd take a pic of where it is on motor, and the part itself. As u can take it off in minutes. An try a junkyard, any GM car 98-2005 should have that Same exact part u need buddy. Hope u found it. Just noticed comment is very old 😂
Good Job!
Nice job!! I knew it was the Dorman manifold the second you said the bolt holes dont line up. Dorman parts are JUNK!!! NEVER USE DORMAN ANYTHING!!!
I used a dorman on mine and have no problems at all. Yours was probably a fluke. Mine has been in use for a year now and oil never shown sludge or antifreeze.
Thanks very helpful!!
My car died last week. It may be old but I take good care of it. I suspect it is upper intake manifold related. Pulled it off today. Don't see any cracks or distortion. Would it have been something as simple as the bolts got loose with time? There was a ton of coolant on top of the lower intake manifold and in the #6 cylinder. Stuck a nylon tube into the plug hole and sucked what I could out with a shop vac. I ordered new plenum gasket (upper intake gasket) and new plugs. I noticed you didn't mess with the head gaskets. Is there a sure fire way to tell if the head gasket or the plenum gasket is the culprit? There was no external leak. Had already replaced the "plastic elbows" with the same aluminum ones a few years ago.
Thanks for the tips!
Np, thanks for watching.
Great video. However I have completed the work with new parts and have coolant leaking into the throttle body. Should the third port be plugged?
Your videos helped me change the timing belt on my 07 Galant, and now this will be a great help for my 08 Grand Prix when the time comes. By the looks of things it's hard to get any kind of lower intake that's not made by Doorman anymore unless you want to pay $500 at the dealer, so I'll definitely be going to the junkyard if at all possible, but otherwise just hope that my lower isn't too badly corroded. I'm seeing some wetness on the side of the engine facing forward when I look beneath the right side dog bone bracket, so I'm thinking one of or both of the gaskets might be starting to go, but there's nothing on the floor and nothing in the oil so if that is the problem I'm not gonna mess with it just yet. Any other thoughts on what it might be? Seeing as it's the right side and not the left, I don't know what else would be leaking coolant wise other than the t stat which I already changed.
So, just so I understand there is no coolant running through the black upper intake except where the throttle body is on the drive side. Was there a gasket there you had to replace too on the throttle body? Also there is coolant running through all of the lower intake right? Did you have to do anything special when the oil and coolant mixed with that bad intake? I assume just drain oil and put fresh in? DO you think there is still some coolant in the oil parts or does it eventually get clean out by the filter and putting new oil in again? Great job on the video thinking about tackling it myself. I have a leak by the throttle body and my mechanic found another one on the front lower intake.
Scott Murdock If I remember correctly yes, top intake on the throttle body and there is a gasket between throttle body and top intake. Lower intake is where more than likely you have a leak if coolant is in your crankcase, drain and refill run engine for 30 seconds. Drain and refill again and you should be good. But check oil condition and repeat as necessary. You dont want to leave any significant amount of coolant in your oil. GL
Nicely done!!! Getting ready to attempt to do mine. the leak appears to be the plastic 90* elbow that is visible easily. Not certain if I will replace them (the 2 elbows) only or do the entire process. A mechanic told me that he has done many and knows of none that have gone +120k miles without gaskets being changed. I have 180k, I replaced radiator (I think the radiator was the first part coming down the assembly line as everything seems to be attached to it) in about 5 hours. Could not find most of the tools needed. TOTALLY DISORGANIZED. No leaks at any rate. I'll sleep on it.
and yes RTV not recommended on gaskets except the corners of the single flat gasket on either end of the block. One gasket cannot be made to fit economically.
thanks for taking the time to share
mike g np, glad you liked it. cheers
Did your plenum kit come with any restrictors to drop into the EGR tube coming up into the intake? Did you flush & refill the oil or just drain & refill? Did you heat cycle the engine after installing the new gaskets?
Very good video! Nothing like a brand new part being a piece of crap huh? I have a 1994 and my tensioner is different but I have both an oil leak AND a coolant leak on the passenger side. I lose 1 quart of oil a week and only see drops of coolant so far. Once again great video and camera work.
Steve Raymond np, glad you liked the video. Hope you are able to fix it. cheers
My pcv port on the rear bank cylinder head is allowing water up through the throttle body. Does this mean my head gasket is done? Or is my block cracked?
LOL I got a video! OK? Awesome video man!
Great Video. Very helpful. Thank you!!!
***** np, thanks for commenting.
My aluminum coolant elbows went in way too easy. I wish I could verify if the seal is any good before I have to take it all apart.
Very well done. worth watching.
thumbs up buddy, doing the same job and you made it very clear and easy to follow. great presentation !!!
I will check out your other vids and subscribe to your channel as you may save more money.
haha sounds good, see you at the next video. cheers
GreatVideo!
Great video ..helped me out alot
Thanks for video brother that was very helpful ✌🤘🤘
Donde consigo esa tapa multiple de la admicion nueva
If you can't pull up the engine intake monifold won't come up means the gasket seal good still?
I'm getting ready to tackle this myself....was wondering why you wouldn't go ahead and replace head gaskets as well? Was this vehicle blowing white smoke like mine is or just a noticeable leak??
Blowing white smoke, ya u probably do need head gasket change. Sure he didnt change head gasket because it didnt need it. And after doing it a cpl times if needed ya can have it rite back down to heads in 2-3hrs
I need you at my home to replace the 4.9 Cadillac engine.
Junk...don't even bother
good video, nice job, and congrats
AWESOME VIDEO
+Tj Trev thanks
Great video. I’m about to do this same job, I think. If I am getting coolant in my air cleaner box when turning car over do you think it’s the upper intake gasket at the throttle body or go ahead and replace both upper and lower? Also car will not start, a lot of coolant pours out the bottom of air cleaner box.
Ya I'd def say something is plugged up in that upper intake. Where the throttle body hooks to it, thats only 2 spots where antifreeze flows thru. Sure it's fixed by now. If not surely I can help. I've changed a few of these an doing another now on my older 02 impala. But yes probably the upper intake. Which is easy as pie to fix. Seems hard but with these vids and a Haynes manual from autozone etc for $20-$25 it gives step by step instructions with pics even etc and you could surely change that upper intake easy. Goodluck
If it's not the upper intake it could possibly be plugged up on the throttle body side maybe, nvr saw that but notsure what else it would be. Actually make sure you've changed your thermostat recently. If they go bad, it will not let coolant circulate through motor an could possibly end up backing up thru throttle body and into air duct an then into the air filter box. Nvr saw that b4! But shouldnt be a hard fix. Goodluck
bro where is your shop at I got a upper intake leak needs fixing ?
i second that awesome vid
I did the same exact thing as you!!!! woke up the next morning and coolant was on my oil dip stick and car wouldnt start at all. All my lower intake gaskets are still in place. How did you get to start
And how did you get all that mixed oil out of your engine?
Ya def make sure to drain all that oil and replace with new, after u figure out why it mixed again after fixing it in the 1st place. Hopefully you did the job rite. Have to be very careful setting the lower intake on them gaskets. It shld set on once an be all lined rite up. If moved around the gaskets will move an could cause this. Unless you have a head gasket blown. Which is possible. But hopefully not! Gl
Hello there well i did mine and everything sounds good but i dont know why im creating so much vacumm i cant take the oil cop while is running and a whisel comes on on idler any ideas
Check your PCV valve as I had same problem
subbed watchd all three... im about to have to undertake this project i believe..on my gfs car:( 2000 impala LS
Nice, good luck. Take your time and you should be fine.
Also a Haynes manual really helps alot. With this vid aswell you can change almost anything on that motor
Hey how's it going? I have a 02 impala ls that is leaking oil on the right side down by the lower intake. I changed my oil sending unit switch already. I was told that it could be my lower intake gasket. Do you think so as well. I was also told it could be a blown head gasket. I do have blue smoke coming outta the tailpipe. The car idles roughly while driving. Can you let me know whether it's the lower intake gasket or the head gasket? Lastly there's no milkiness in my radiator or in my oil if that helps. Get back with your suggestion plz thanks!!!!!!
The oil leak could def be the end seals as he said at end of the vid. On either side them end seals on lower intake can leak oil their if go bad. The rubber part he put on just b4 the new gaskets. When he used silicone on the corners and stuff. As far as running rough, it's most likely a sensor, like the mass air flow which are well known to go bad and a simple cheap fix also. Hope ya got er fixed up.
If it was head gasket it would have alot of white smoke coming out your exhaust, blue just means its older prolly an burning a little oil. Usually no big deal at all. But also the valve cover gaskets (easy fix) can cause a oil leak alot more commonly than the lower intake end seal. And way easier hope it's fixed an running good. These motors will run til the frame rusts an breaks if u take care of them etc. My fav motor ever. Reliable as heck. Only.flaw is that darn intake gaskets. But if u change the stock to upgraded good 1s it will nvr need changed again. Gl
would a bad l.i.m or u.i.m gasket cause a vacuum through the dipstick and oil filler opening on a 3800?
Check your PCV valve
As these guys said. Both could be possible
Where did you get the graphics diagrams the printout from?
And what do you mean by 89 lbs torch?
I think he said 89 inch lbs torque (around 7.4 ft lbs). I think that is about 10Nm. That is not very much.
11.15.20. 89in/lbs of torque, not 89ft/lbs. 12in/lbs = 1ft/lb. Thus 89in/lbs = 7.4ft/lbs
i thought its recommended to use rtv when putting new gasket manifold on
o0Orange Generally speaking RTV is not recommended on manifold gaskets.
Only a little silicone, sealant whatever ya wanna call it on the 4 corners where side seals meet with the gaskets.
GM dealer gave you the wrong part. Should have been 89017816 not 89017825 ( which is for supercharged version of 3.8L.
+Ray Fraser Are you saying this is why the coolant leaked into the crankcase, and it was not the new lower intake manifold? I'm replacing the upper plenum and the lower intake manifold gaskets right now on my 03 bonneville and I noticed the new lower gaskets don't look quite right and I may have been given the wrong ones from advance auto. I'm going to double check before I put it back together and hopefully avoid a huge ass-ache of having to redo it!!
+Mark Emmi
Acdelco part number on his package is for the a supercharged intake which is different than a nonsupercharged gasket. After looking at a Felpro aluminum gasket I bought an Acdelco aluminum gasket from a GM dealer because the aluminum was thicker and more like original plastic gaskets. In video he blames problem incorrectly on manifold not realizing he had the wrong gasket.
Ya sounds about right to me. Smh, darn auto stores shld of made sure aswell on which part he wanted. Theirs alot more not supercharged 3800s than their are ones with the supercharger. Crazy
Thermostat gasket goes around the thermostat not on top.
Sorry but you're wrong. The gasket does go on top. The thermostat housing compresses the gasket on top of the thermostat to make a seal.
It does wrap around. Ive done it 3 times on different cars. All the same
I don't know seems like complicated design by gm and allot of work for simple things like thermostat
What u mean? Thermostat didnt cause this repair. Lol. And the thermostat can be changed just by removing the thermostat housing, 2 10mm bolts and pop.the new 1 in. Can get to it without removing anything! Besides the plastic cover over the motor. I can change the thermostat in literally 10mins. Goodluck
Not many cars u can change the entire intake manifold in a cpl hrs if you know what your doing, or even just learn off vids like this and buy a Haynes manual for your car. Shows how to change anything with pics etc step by step for $20-$25, goodluck
So the Dorman LIM is junk huh? Who's else makes the LIM for these?
i hate to think what my 98 buick looks like.
8
Hey boss! Only 3 parts right? Good call on the lower manifold. I didnt change mine on my firebird and leaked again. I used silicon and yepp.
i have coolant coming from the back side of my upper intake manifold or in that area should i do this whole process ?
bro where is your shop at I got a upper intake leak needs fixing ?
Frank Gonzalez me too
Use the vids an fix it. Really very simple if know anything about a car, even the basics, buy a Haynes manual for your make an model of car and it has directions step by step, and pics even etc. $20-$25, and it really helps a ton. Then with vids etc too, the upper intake is a piece of cake
Sry just realised this is very old surely u had it fixed by now Haha. But really with today's technology at your hands most tasks besides a motor change or maybe head gasket even etc almost any1 can do them if they spend a bit learning. Goodluck hope ya got the prob solved
i have coolant coming from the back side of my upper intake manifold or in that area should i do this whole process ?
Most likely. I'd atleast take the upper intake off if cant find the leak anywhere else. And usually if the gaskets real bad to leak u can find the bad spot in the old gasket to make sure it was the problem then use the vid or a Haynes manual for your car to fix it. Goodluck. Them Haynes manuals are amazing. Shows how to change anything on these cars an motors. Also the 3.1L an 3.4L but I love the 3.8/3800 fav motor ever. Simple intake once fixed with the upgraded gaskets and you never gotta worry again. The gaskets they came with were poor quality. Goodluck