Has anyone had a problem with cat ingestion?
Discussion
It has been done to death have a look at the post that is still running.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Caslad said:
It seems pretty clear to me that you will not find a consensus. Some, like BR feel it is a rare but significant problem. Others, like McGurk deny it’s an issue at all.
I saw a thread on the AMOC forum a while ago on a car with the problem, so I'm erring more to Mike (rare, significant but preventable with the correct maintenance (including comprehensive misfire diagnosis) than with McGurk (don't worry, we've never had one so it doesn't happen)bullet7 said:
I don't get all the fuss. There is a known problem, which is quite rare and this is acknowledged by BR. If you are a V12 owner, you have a choice of taking a preventative measure or doing nothing.
A number of PH'ers seem to think that Mike is just scaremongering to raise businessheres some research i did.
This is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
This is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
As I said on another thread, there are 3 contributors in the comments section of JayEmm’s latest video who state that they or someone close to them has had an issue with cat ingestion so it happens and as cars and catalysts get older it’s going to keep happening. There are a number of ways to try to prevent it and removing the offending catalysts seems to me the most definitive.
karatemaserati said:
heres some research i did.
This is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
Probably a different issue. While the cats are in a similar position (the V12 AML cats are even closer to the ports) the AML V12 has internal EGR with large valve overlap, deliberately drawing some exhaust gases back into the engine; the posts on the Toyota forums seem to refer to low power due to cats becoming blockedThis is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
Caslad said:
As I said on another thread, there are 3 contributors in the comments section of JayEmm’s latest video who state that they or someone close to them has had an issue with cat ingestion so it happens and as cars and catalysts get older it’s going to keep happening. There are a number of ways to try to prevent it and removing the offending catalysts seems to me the most definitive.
My approach would be to find the root cause first intead of jumping in and splashing out the best part of £4k to remove the Primary cats, changing the secondaries and an ECU remap. Check why it's misfiring and sort that first, once sorted you won't have a primary cat issue. It will almost certainly be a much cheaper fix and solution to the problem. Keep up a good service history, at each service get whoever is doing it to check the misfires, if misfires are found then fix what is causing them, problem solved. It's not rocket science and just knocking out the primary cats is not getting rid of the root cause. If the root cause is not identified and left to continue you could end up wrecking/washing out a bore, then you're f
ked. Oh hang on you can go to BR and get them to sell you a new/remanufactured engine. How deep are your pockets?I dont think I've ever head BR mention fixing the problem that causes the Primary cats to fail. Maybe he wants those bores to get damaged, I don't know.
Good service and maintenance is what is required.
karatemaserati said:
heres some research i did.
This is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
Oh dear. I've owned a mk 2 MR2 for twenty years and a DB7 V12 for 12 years.This is a cat from a mk2 Toyota Mr2
See any similarities?
Now Google "mr2 catalytic converter failure"
It's the exact same problem.
The v12 has twice the amount of cats and more cylinders exhausting on them... later engines have vvti that exacerbates the problem
Whilst looking for a db9, almost every time I looked I'd come a across a different one with "new engine", now a few would have been the tick which was ironed out... But I'd bet a fair few had cat failure.
Also I looked at a few soggy cat D's with "new engines"... imo they were made soggy on purpose cause the engines were goosed.
I might start panicing or I might bury my head back in the sand.
There has been a lot of discussion on here regarding this issue. I think we can probably all agree that it can happen, although it does seem to be a relatively rare occurrence vis à vis the number of V12 engines that are in circulation. So I guess the right line is somewhere between the two specialist views mentioned. I’ve not seen too many posts on here from V12 owners who have actually experienced it, so to see three in JayEmms video is a little strange. But I guess a lot of these engines are now getting quite old, and if basic checks such as coils, misfires and plugs have been missed or ignored over time, the likelihood of it happening surely must increase. One thing I will say, and I’ve said it before, is that I am unaware of any official AML stance or statement on this subject. One would think that surely they would be aware of it if it is a common problem. Has anyone seen anything from them at all? BRM.
Minglar said:
I am unaware of any official AML stance or statement on this subject.
One would think that surely they would be aware of it, if it is a common problem.
Has anyone seen anything from them at all? BRM.
One would think that surely they would be aware of it, if it is a common problem.
Has anyone seen anything from them at all? BRM.
More likely to hear a monk speak during a vow of silence, than a statement about this from AML.
The Fujitsu approach is in widespread use, when consequences arise.
Jon39 said:
Minglar said:
I am unaware of any official AML stance or statement on this subject.
One would think that surely they would be aware of it, if it is a common problem.
Has anyone seen anything from them at all? BRM.
One would think that surely they would be aware of it, if it is a common problem.
Has anyone seen anything from them at all? BRM.
More likely to hear a monk speak during a vow of silence, than a statement about this from AML.
The Fujitsu approach is in widespread use, when consequences arise.
My good mates DBS ingested its cats on one bank.
No signs of any failure of any parts until a light trail of smoke from one side of the exhausts.
I know of 2 others as well from memory.
AM replaced the engines.
They’re getting on a bit now but ultimately its up to each individual what they do.
Cannot understand why its of so much concern to those that don’t even own a V12.
No signs of any failure of any parts until a light trail of smoke from one side of the exhausts.
I know of 2 others as well from memory.
AM replaced the engines.
They’re getting on a bit now but ultimately its up to each individual what they do.
Cannot understand why its of so much concern to those that don’t even own a V12.
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