Front catalytic converter. Old vs. New
#41
I had an odd noise when I revved the engine in idle or park; I heard a wobble/rattle sound as the RPM needle went back to normal idle.
Replaced the bank 1 front pre-cat and sure enough the catalyst material inside was loose.
Replaced the bank 1 front pre-cat and sure enough the catalyst material inside was loose.
#42
just a correction, the bank 1 cat is the one closest to the firewall, bank two is closest to the radiator ...
sucks i need the one in the back
#43
Those of you that have replaced the cats are very lucky. Good thing you noticed the problem and replaced the POS.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
#44
#45
diff things u can call them
front front cat
front bank 1 cat
bank 1 pre cat
front pre cat
front rear cat
front bank 2 cat
bank 2 pre cat
rear pre cat
when refering to rear cat I think its the last one under the car after both sections have joined.
When someone says rear pre cat I think manifold closest to the firewall.
#46
wait i'm confused now
when i looked up replacing the cat in Alldata, it only had the main cat listed as a cat on Maximas .
The California spec Maxima had the precat closest to the firewall as a secondary cat.
can anyone correctly identify how many cats our cars have from the factory???
i'm getting conflicting information.
#47
wait i'm confused now
when i looked up replacing the cat in Alldata, it only had the main cat listed as a cat on Maximas .
The California spec Maxima had the precat closest to the firewall as a secondary cat.
can anyone correctly identify how many cats our cars have from the factory???
i'm getting conflicting information.
when i looked up replacing the cat in Alldata, it only had the main cat listed as a cat on Maximas .
The California spec Maxima had the precat closest to the firewall as a secondary cat.
can anyone correctly identify how many cats our cars have from the factory???
i'm getting conflicting information.
a "precat" on each bank and the main cat
#49
Those of you that have replaced the cats are very lucky. Good thing you noticed the problem and replaced the POS.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
#50
wait i'm confused now
when i looked up replacing the cat in Alldata, it only had the main cat listed as a cat on Maximas .
The California spec Maxima had the precat closest to the firewall as a secondary cat.
can anyone correctly identify how many cats our cars have from the factory???
i'm getting conflicting information.
when i looked up replacing the cat in Alldata, it only had the main cat listed as a cat on Maximas .
The California spec Maxima had the precat closest to the firewall as a secondary cat.
can anyone correctly identify how many cats our cars have from the factory???
i'm getting conflicting information.
#51
You'd be wise to pick up the FSM and go over that, it's always 100% correct however what I found is a conflict going from FSM into parts stores that name parts differently. So annoying. I'll also use www.courtseyparts.com to get another idea of what stuff is called and how much it'll cost.
yeah i DL'ed the FSM from nicoclub and from what i have seen it doesn't list the bank 1 ( Y pipe section ) as a cat converter. It's called " exhaust tubing " or something like that
I also physically looked at my radiator side precat and it looks nothing like the pic in courtesyparts.com bank 2 precat.
i'll have to take a pic when i get a chance because i'm really confused at the moment
#52
yeah i DL'ed the FSM from nicoclub and from what i have seen it doesn't list the bank 1 ( Y pipe section ) as a cat converter. It's called " exhaust tubing " or something like that
I also physically looked at my radiator side precat and it looks nothing like the pic in courtesyparts.com bank 2 precat.
i'll have to take a pic when i get a chance because i'm really confused at the moment
I also physically looked at my radiator side precat and it looks nothing like the pic in courtesyparts.com bank 2 precat.
i'll have to take a pic when i get a chance because i'm really confused at the moment
#54
If its throwing p0430, its the front bank pre-cat. If its p0440, its the rear bank pre-cat. Different part numbers.
#60
Where'd the rest of my post go?
I used 02 spacers. 0430 code went away. I may be facing reduced mpg though and am checking over the next few weeks.
Someone above was talking about the pre-cat jacking up the engine. I have heard the contrary from a few mechanics though. Not trying to confuse the issue but I guess I will.
I used 02 spacers. 0430 code went away. I may be facing reduced mpg though and am checking over the next few weeks.
Someone above was talking about the pre-cat jacking up the engine. I have heard the contrary from a few mechanics though. Not trying to confuse the issue but I guess I will.
#61
Pre-cats will screw the engine when they fail and become brittle, break down, and end up getting sucked into the combustion chambers scarring the walls and causing other catastrophic headaches.
With the 02-03 pre-cats so close to the engine and so close to heat, they are likely to fail and become troublesome than they are of helping anything.
My car has not had any pre-cats since October of 2004 and it's fine right now, 6.5 years later and 90k miles later.
With the 02-03 pre-cats so close to the engine and so close to heat, they are likely to fail and become troublesome than they are of helping anything.
My car has not had any pre-cats since October of 2004 and it's fine right now, 6.5 years later and 90k miles later.
#62
Try Googling pre-cats and engine damage and see what you find. Shock! Only Maxima forums and one MR2 forum mention the two. If pre-cats could get sucked backwards into the engine through super-aggressive VVT, you think you would read about it all over the internet, since so many engines use some form of VVT these days.
Pre-cats are all the rage these days.
#65
Those of you that have replaced the cats are very lucky. Good thing you noticed the problem and replaced the POS.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
(Yes, I'm announcing this again lol)
If you do not gut the cats, replace them or get headers, your engine will be ruined. End of story. It's a ticking time bomb. Even if you have lower miles and think you're safe... WRONG. At 75k they ruined my engine and I didn't notice any symptoms until it was too late.
#66
Pre-cats will screw the engine when they fail and become brittle, break down, and end up getting sucked into the combustion chambers scarring the walls and causing other catastrophic headaches.
With the 02-03 pre-cats so close to the engine and so close to heat, they are likely to fail and become troublesome than they are of helping anything.
My car has not had any pre-cats since October of 2004 and it's fine right now, 6.5 years later and 90k miles later.
With the 02-03 pre-cats so close to the engine and so close to heat, they are likely to fail and become troublesome than they are of helping anything.
My car has not had any pre-cats since October of 2004 and it's fine right now, 6.5 years later and 90k miles later.
And all my cars have had pre-cats since they day they came off the line without any issues. You sure it wasn't that mythical unicorn that got sucked up into the engine and cause "catastrophic headaches"?
#67
I know, right? I've already stated in the other pre-cat detonation thread that I don't think the VVT on the VQ35s is anywhere close to what it would have to be to theoretically choke on some pre-cat dust at idle. They engineered our engine to be a daily driver, not some insane sports car with an exhaust valve that almost never closes.
Again, Child of Korn's pre-cat dumped into his main cat, which clogged, which hurt his engine until his mechanics unplugged the main cat for him.
Again, Child of Korn's pre-cat dumped into his main cat, which clogged, which hurt his engine until his mechanics unplugged the main cat for him.
#68
Originally Posted by Eirik
I know, right? I've already stated in the other pre-cat detonation thread that I don't think the VVT on the VQ35s is anywhere close to what it would have to be to theoretically choke on some pre-cat dust at idle. They engineered our engine to be a daily driver, not some insane sports car with an exhaust valve that almost never closes.
Again, Child of Korn's pre-cat dumped into his main cat, which clogged, which hurt his engine until his mechanics unplugged the main cat for him.
Again, Child of Korn's pre-cat dumped into his main cat, which clogged, which hurt his engine until his mechanics unplugged the main cat for him.
The "choppy" curve is the A33B/A34 and the smooth, more advanced in the low RPM curve is the Z33/V35.
#69
Does the exhaust timing follow that same curve?
...since that is what would let material into the engine. I'll freely admit that that curve doesn't mean a whole lot to me since I don't have any other values to compare it to. All VQ35s have EGR, right? Most of my reading indicated that using overly-aggressive timings to meet emissions on engines without traditional EGR systems can cause problems.
How many people got a TS flash (may they rest in peace. =( ), anyway? I wouldn't think that it is enough of a change to cause reversion on a scale large enough to do what all the "FUD" is about. But it's an interesting thought, nonetheless.
...since that is what would let material into the engine. I'll freely admit that that curve doesn't mean a whole lot to me since I don't have any other values to compare it to. All VQ35s have EGR, right? Most of my reading indicated that using overly-aggressive timings to meet emissions on engines without traditional EGR systems can cause problems.
How many people got a TS flash (may they rest in peace. =( ), anyway? I wouldn't think that it is enough of a change to cause reversion on a scale large enough to do what all the "FUD" is about. But it's an interesting thought, nonetheless.
Last edited by Eirik; 04-06-2011 at 07:03 PM.
#70
well just recieved my pre cat from discountcatalyticconverters.com, the only gasket I got with it was the smaller one that goes to the exhaust, so I just gave them a call and asked them about the manifold side and they said that needs to be ordered separately
you think they would have mentioned that when I ordered the cat
you think they would have mentioned that when I ordered the cat
#71
It's not variable so, no.
Most if not all TS candidates most likely have headers, so that narrows the population down further.
Or, you would have thought you would have been ready and ordered some beforehand like previously instructed.
Originally Posted by Eirik
How many people got a TS flash (may they rest in peace. =( ), anyway? I wouldn't think that it is enough of a change to cause reversion on a scale large enough to do what all the "FUD" is about. But it's an interesting thought, nonetheless.
well just recieved my pre cat from discountcatalyticconverters.com, the only gasket I got with it was the smaller one that goes to the exhaust, so I just gave them a call and asked them about the manifold side and they said that needs to be ordered separately
you think they would have mentioned that when I ordered the cat
you think they would have mentioned that when I ordered the cat
Originally Posted by RR5
Why risk things? Just pickup the gaskets.
Originally Posted by asianstyle
Lol. When I bought mine. It didn't come with a gasket I don't believe. It's been awhile.
Originally Posted by Me
Does a bear poop in the woods?
Last edited by NmexMAX; 04-07-2011 at 11:01 AM.
#72
I actually did pick them up a few days ago, at my local autozone, but when I got the cat today the gaskets weren't the right size, just got back from returning them, the top manifold side is a dealer item, some kind of 2 piece gasket, a mesh and a shell
just thought it was funny that they never mentioned needing a gasket, you'd think they'd try to sell you that as well when ordering the cat, oh well, just a heads up
just thought it was funny that they never mentioned needing a gasket, you'd think they'd try to sell you that as well when ordering the cat, oh well, just a heads up
#73
I actually did pick them up a few days ago, at my local autozone, but when I got the cat today the gaskets weren't the right size, just got back from returning them, the top manifold side is a dealer item, some kind of 2 piece gasket, a mesh and a shell
just thought it was funny that they never mentioned needing a gasket, you'd think they'd try to sell you that as well when ordering the cat, oh well, just a heads up
just thought it was funny that they never mentioned needing a gasket, you'd think they'd try to sell you that as well when ordering the cat, oh well, just a heads up
#74
I installed my Eastern pre-cats front the other week without the gasket and so far the light hasn't came on since. The old gasket didn't fit the new Eastern pre-cats and their were members that stated the OEM gaskets would not fit the Eastern cats because of the "legs" on them. So far no exhaust leak or strange noises ... knock on wood
#76
Hello, Well I was at the shop and was told I needed a new cat (p0420) among other things (shock and struts, tires, radiator). I have an 02 max se mt6, is this the part I need, I would hate to order the wrong thing..
http://www.proimporttuners.com/index...roducts_id=513
the rear was the one i was told i needed and dont want to pay the $650 no name produst the shop is pushing.
Also, do new headers eliminate the need for the cats all together or just one? and which one? Was told by the shop that I had to have the cats per texas law. But I know in today economy people might be willing to "fudge" the numbers a bit for their bottom line.
If not the magnaflow is there a better option? Was intrested in a cat back but i need the "cats" right? ugggg my head is spinning.
Thank You very much for your time.
http://www.proimporttuners.com/index...roducts_id=513
the rear was the one i was told i needed and dont want to pay the $650 no name produst the shop is pushing.
Also, do new headers eliminate the need for the cats all together or just one? and which one? Was told by the shop that I had to have the cats per texas law. But I know in today economy people might be willing to "fudge" the numbers a bit for their bottom line.
If not the magnaflow is there a better option? Was intrested in a cat back but i need the "cats" right? ugggg my head is spinning.
Thank You very much for your time.
#77
Headers will eliminate the front pre-cats(2). The rear cat can be replaced with a stock, hi-flow, or test pipe. I'm sure you can find a shop that will install about anything you want. It's all in how you ask. Austin doesn't have emissions testing, right?
#78
Williamson County does have emission testing sad to say , . I need to register my car back in temple (60 miles north) where they dont have it but its only a matter of time before they do.
Figure if i have to spend $500-$600 for a cat, just getting headers might be a better option, or the hi-flow cat. Looks like im about to start putting some money into my car.
Figure if i have to spend $500-$600 for a cat, just getting headers might be a better option, or the hi-flow cat. Looks like im about to start putting some money into my car.
#79
Williamson County does have emission testing sad to say , . I need to register my car back in temple (60 miles north) where they dont have it but its only a matter of time before they do.
Figure if i have to spend $500-$600 for a cat, just getting headers might be a better option, or the hi-flow cat. Looks like im about to start putting some money into my car.
Figure if i have to spend $500-$600 for a cat, just getting headers might be a better option, or the hi-flow cat. Looks like im about to start putting some money into my car.
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