Nissan Pre Cat Failure - Altima, Murano, Quest, I35, Maxima
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- Опубліковано 9 вер 2024
- in this video I show you the early signs of vq pre cat failure. if not taken care of at an early stage these particles can get sucked into your motor causing it to seize.
link to the aftermarket cats I replaced mine with
www.racinglinep...
Bank 1 is the firewall cat (behind) bank 2 is always in the front
It's the opposite: rear (or right hand) is bank 1, front (or left hand) is bank 2. Whichever has cylinder 1 (the closest one to the crankshaft pulley) is bank 1.
Another note: it will not suck into the engine. What it will do is skew intake vacuum and a/f(o2) signal usually going excessively rich, and hot resulting in pinging. Which is bad. Way to check properly is exhaust back pressure test. No more than .5 psi at idle, 1.2 psi at 2500 rpm. My $0.02
Ok thanks cuz i thought the broken pieces i side the cat gets into the engine
My son has an 09 Altima and we have had an issue with decreased power/rpm. I replaced the front (bank 2) and hoped that would fix the problem, but after 5-10 min of driving the problem came back, so we are going to pull the rear or bank 1 cat. Hopefully this will help. Thank you for the video.
All these comments are funny 😄 so I hollowed out my bank 2. Deleted resonator and muffler and straight piped where the muffler was. I got so many compliments on the sound. It was incredible. Buttttttt I had bad misfires and couldn’t get it right. Long story short I ended up hydrolocking the engine threw my cold air intake in a flash flood stuck in traffic in florida. I loved that car. So if you’re thinking about hollowing and dummy plugging the sensors better know what your doing first. I’ve heard several things that I could of done like re gauge the spark plugs and or take it to a tuner shop for the right tune. I never got that far unfortunately because of the hydrolock. Just a bit of information for your reading pleasure. Good luck!
GReat vid mate...thanks. Gives me an idea of the damn cast iron lumps that give the major grief
Just a note -- Bank 1 is not the 'front' on Nissans (and most transverse mounts). The 1,3,5 cylinders are on the firewall and 2,4,6 are by the radiator. So, Bank 1 is back, and Bank 2 is front.
ww2.justanswer.com/uploads/Joecamel90/2010-02-21_110606_bank.gif
Does the 2.5 liter 4 cylinder have a Pre Cat in the exhaust manifold? I have 225km on my 2011 Frontier.
I don't want anything to get sucked into the engine. Also the balance shaft that spins at 2x the speed of the engine and can fail and destroy engine i would like that gone.
welp...im about 30,000 miles past due on my maxima. The mechanics who looked at it had NO CLUE this was an issue with these years nissans. It's burning oil like mad and got oil sludge build up...im absolutely sure it's due to the pre-cats failing. God I wish I knew earlier. Who knows the damage to the 3.5 this has done so far.
Time to take some headers off and blast out some cats!
Hey first thanks for the videos! An second an you put s link on here for the high flow pre cat headers.
Thanks an keep up the the awesome videos!
Adam Bertels thanks man, appreciate it. lots more to come. I added a link in the description for the pre cats.
Kool!
Can a bad cat result in significant rpm drops while letting go of the accelerator?
Excuse my ignorance, but from which point can something get sucked into the engine, it's not connected to the intake?
Yes please do answer because I'm curious also.
In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. This dilutes the O2 in the incoming air stream and provides gases inert to combustion to act as absorbents of combustion heat to reduce peak in-cylinder temperatures. NOx is produced in a narrow band of high cylinder temperatures and pressures. - JUST GOOGLE EGR
Guillermo Corvera but the engine in this video doesn't have egr, except for engine blowby vapours.
The cams hold the intake and exhaust valves open at the same time.
Guillermo Corvera Good answer. Now, if only it were relevant to the question...
" big money " yeah for real especially here in Cali where all cats have to be CARB certified and the number of cats some cars have these day... You are basically look at scraping the car if you need to change the cats...
Did it blue smoke any I need to do plugs on my murano 09
V6 engine right. I have the 4 cylinder
hey there, I've got an SER, and the radiator side precat looks exactly exactly the same than yours looked. First I realised there was a leak in the union among the precat and the manifold. So, when I removed the precat, I found that, where the precat started to go out, it's exactly the same where it's the leak. Also, I knew I hit (not so badly) exactly in the lower of the precat (sorry my bad English), and I was wondering if you think a leak could cause that damage to the precat compound, as oxygen is allowed to enter and maybe it increases temperature in that spot. By the moment, I'm unsure what brand I should use, because here in Mexico, it's a little hard to find quality parts. Autozone sells that precat, made by Magnaflow, about $400 USD. Also, I have to pass emission test, so deleting is not an option. What could I do to fix that leak, if the parts don't look damaged, twisted or cracked? thanks a lot
I just replaced My 03 2.5 pre cat. The filter in the manifold/catalyst is gone. Car runs fine no knocking or anything..no oil consumption.. Should I still be worried?? She just hit 377k miles. 15 years of dependable service
I don’t think so. I’d love to hear if she’s still running
When these things go bad do they make or cause any noises like ticking?
hey so i have a altima 3.5 SER 300thousand km there is a hole on the pre cat right beside the 02 sensor and i am getting a multiple missfire code are these 2 things related ? the hole is so bad when i start the car and go underneath i can feel the air swooshing out and faint smells of gas oh and this is bank 1 behind the engine with the firewall
03 max pulls to 1/2 throttle anything past that & it doesnt go faster pull back to around 1/2 again & its ok. beginning of pre-cat and cat failure? Its hard to start too like 6-8 turns way too much.
Hey man I got a 2011 Altima coupe 3.5 I have no acceleration light misfire car will not rev up when is it operating temperature but went cold it will rap in park my question is are my cat's going bad I hear rattle and exhaust I think one of the three cats is blocking the third cat Downstream cat sorry Google Text-to-Speech sucks
I have a 2003 Nissan Altima and it started throwing the P0420 code. Tried everything before the pre-cat and the code is still there. I want to buy the racing-line pre-cats but I don't think they will pass smog in Cali :|
Jacob Delgado they didnt throw a cel on my car. I know you guys have strict laws but im sure if you left your secondary cat alone you would pass.
Kilometers X 0.621 = Miles
Just sharing some useful info 😊
Can some1 help me..Does the broken pieces ofthe cat (firewall side) gets in the engine?
my moms 2009 murano v6 awd hesitate from stop at certain times would this be the issue.
Hey buddy first off, sorry about the Sentra, hope you get something similar or better. I have a question. I have an 08 Altima coupe 3.5 and due to its discontinuation, there are no longer performance parts. I wanted to gut the precats but was wondering if gutting and putting a straight pipe through it would be better than to just gut it and leave it like that? What are the pros and cons if any? Taz from Racingline Performance isn’t around anymore so I’m S.O.L please help
Richard Sharma thanks man, if you were to gut it and had the time to put a straight pipe through it would probably flow be the that way for sure. You could always go for some aftermarket eBay headers for a cheap easy bolt on
I want high flow cars for my 06 but I think racingline doesn't exist anymore
I Never Knew It Affected 3.5 Models.
Renault- Nissan went cheap at the expense of reliability.
How does it get sucked into the engine if this is AFTER the engine?
This is a post from another video: "The broken catalyst gets sucked into the engine through the exhaust when the engine goes to scavenge, most notable would be following the rev of an engine, downshifting, shifting from one gear to the next, any time the engine revolution changes from fast to not as fast. also please note that the QR25DE DOES NOT have a physical E.G.R. system. if it did there would be a pipe that attaches to the exhaust header to capture exhaust for reintroducing back into the combustion process. Nissan did away with the EGR system by exploiting the Scavenge stage of the engine along with using a more advanced engine control computer system.
"
so they have to be california?
It is a myth, nothing can be sucked back to the engine, there is no negative pressure there
Hey brother I have an 6th Maxima 08 to be specific.. one of my cats is going bad can I just take em off n straight piped it?? Sorry for the dumb question... But I'm a noob when it comes to this ...
Javier Saravia yea a lot of guys I know remove them and hammer out the honeycomb inside. Or you can buy headers online and replace everything
Dont even try, your shit will get noticed by its 02 sensor except well if u decide to tune the Computer. The only thing worth ditching with no consequences is the cat located by your resonator
I'm the second owner of an '02 2.5SL, she's got about 130,000 miles on her, no CEL's yet. If i were to take this to any Nissan dealership, would they be able to do anything for me, or do i need to go to the specific dealership the vehicle was bought from? family owned the car before i did.
+MetalheadEchidna the dealer is probably the worst place to take it for something like this. Cheapest bet would be to get some headers and have an exhaust shop install them
DNALI Should I grab another cat converter? I read there's another cat in the mid-pipe, so I shouldn't have any issues when the car's warm.
what did you end up doing -- 2 years later?
where could i buy the pre cat for bank 2 for California i tried looking but nothing pops up could you please help
I got mine from racinglineperformance.com
Thanks
Did your murano start to hesitate in acceleration and check engine flash
I had this problem with my G35 and yes I had a huge loss of power and check engine light was flashing. Removed cats and problem was solved
@@DNALI you replace with new or deleted them
@@DNALI ?
Is this in the 2.5 S's too?
+CobobS12 yes, i've read on forums about it, i have a 02 2.5SL myself.
Oh, Has it happened to you? Since i've got an 05...
happened to my 03 2.5s 130k miles
Nissan parted ways with Renault hell yes
this destroyed my engine lol. i go thru 500ml of oil a day caus ethe egr system sucked cat material into my cyl 7 and 8 scoring the walls in my armada. if u have an o2 code, adress it right away cause i didnt
We're there any signs
Rod B I had the same thing, it just.....dissolves. No warning. Some people think it causes the oil burn issues.
Rod B no signs on my end. The only reason I changed them was for more powa. Got lucky.
+Rod B when the precat is breaking up and gets sucked back into the engine it will scratch up your cylinder walls, enough to the point of where it will allow oil to get into the combustion chamber, i assume that's where the oil burn comes from.
How about coolent
+Rod B yes the signs are po420 and po430 check engine light, also your car will get very slow/less power. Sometime you will hear a rattling sound when the pre cats break apart inside the housing.
My 2.5 has benr valves from this
60-70k miles? Double that and you'll be more in the ball park
It seems like replacing the pre-cats every 100K miles would be good preventative maintenance, although I've heard of them failing sooner on occasion. My mom just got a P0420 a couple days ago at 160K miles on her 2002 Altima 3.5SE.
DIY Apprentice Headers dude.Who wants to do that every 100k?
And thats even if the car last that long.
@@jakesmith2984100k miles is like 5-6 years for some people
"Front" is next to radiator, is bank 2 and pieces of the catalytic cannot be "sucked into the engine". They will be blown out the exhaust if you are lucky. They will not "destroy your engine" when they come apart. Completely useless video.