Could I have a dreaded CAT munching V12?!!!!

Could I have a dreaded CAT munching V12?!!!!

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AstonExige

Original Poster:

661 posts

106 months

Tuesday 14th February 2017
quotequote all
Took the car to work today, on the way back about 3mins from home, I join a dual carriageway and give it a little bit of beans (not full throttle as it was cold out there) Went quite high in the revs and then the power went. From that point it went really sluggish, felt more than just limp mode. No warning lights. Pulled up at home, switched off and restarted. Engine management light came on and the car felt a little unbalanced on tickover, pretty sure its not firing on all cylinders. I plugged in my OBDII and read the codes (see below) O2 sensors picking up issues which isn't surprising if its misfiring.

So what are the thoughts? Could this be my worst nightmare? I'm hoping if it had munched one of the manifold CATS it wouldn't be so much a misfire, more sounding like a tractor as the cylinder would be damaged? Currently waiting for Aston Martin Emergency Assist to come out although I've been told none are in the area so unless I'm happy for a generic mechanic instead of an AM specialist I'll have to wait until tomorrow morning. So opting to wait for tomorrow morning!




jeyjey

220 posts

96 months

Tuesday 14th February 2017
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I'd think a misfire would show up as too rich, not too lean.

Could be any of a hundred things; I don't think I'd conclude the worst just yet.

Cheers,
Jeff.

Jibberingloon

848 posts

199 months

Wednesday 15th February 2017
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Didnt you get the secondary cats replaced with straight thru pipes at DAE?

Wouldnt that cause issues with the O2 readings?

Big Ry

1,678 posts

118 months

Wednesday 15th February 2017
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[quote=AstonExige]
So what are the thoughts? Could this be my worst nightmare? I'm hoping if it had munched one of the manifold CATS it wouldn't be so much a misfire, more sounding like a tractor as the cylinder would be damaged? Currently waiting for Aston Martin Emergency Assist to come out although I've been told none are in the area so unless I'm happy for a generic mechanic instead of an AM specialist I'll have to wait until tomorrow morning. So opting to wait for tomorrow morning!


You only bought it 2 months ago so it's under the AM warranty surely.....hence annoying but not a problem.

moveover

345 posts

162 months

Wednesday 15th February 2017
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My V12 had a fractured exhaust valve spring, which was causing something akin to a misfire. Rare but worth considering as a possibility. Took AM a few weeks to figure that one out too.

Jibberingloon

848 posts

199 months

Wednesday 15th February 2017
quotequote all
Jibberingloon said:
Didnt you get the secondary cats replaced with straight thru pipes at DAE?

Wouldnt that cause issues with the O2 readings?
Actually there are no Lambda sensors after the secondary cats.... so ignore me.....

Hope you get it sorted Mark wink

cayman-black

12,625 posts

215 months

Sunday 19th February 2017
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Any news Mark?

AstonExige

Original Poster:

661 posts

106 months

Sunday 19th February 2017
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cayman-black said:
Any news Mark?
Thanks for asking.

Works have it. Doesn't look like it was my worst fear. They think a it was something to do with the air intake, that issue caused lots of unburnt fuel to collate in the cat and it ignited. They've replaced a load of pipes and connectors around the intake and so far seems ok. They're going to test in the morning.

I'm concerned about damage to the CAT but they said cats aren't like they were years ago, they can take that??


Edited by AstonExige on Sunday 19th February 18:15

cayman-black

12,625 posts

215 months

Sunday 19th February 2017
quotequote all
Good news Mark , let us know more when you collect it.

Big Ry

1,678 posts

118 months

Sunday 19th February 2017
quotequote all
AstonExige said:
Thanks for asking.

Works have it. Doesn't look like it was my worst fear. They think a it was something to do with the air intake, that issue caused lots of I burnt fuel to collate in the car and it ignited. They've replaced a load of pipes and connectors around the intake and so far seems ok. They're going to test in the morning.

I'm concerned about damage to the CAT but they said cats aren't like they were years ago, they can take that??
It is all under warranty though yes ?

AstonExige

Original Poster:

661 posts

106 months

Sunday 19th February 2017
quotequote all
Big Ry said:
It is all under warranty though yes ?
Yes, all warrantied until Feb 2018

Guy at HWM has been great and so has David at Works. So although the niggles have been annoying and a real inconvenience this weekend, they've handled it great.

AstonExige

Original Poster:

661 posts

106 months

Saturday 25th February 2017
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Cars back and running great. It was a cracked intake pipe that caused incorrect fuel air mixture, made the car run like a dog and a load of unburnt fuel to collate in the car and ignite. Explains the o2 readings as well.

So nice and relieved about that one. Not quite sure what would cause a cracked pipe?

divetheworld

2,565 posts

134 months

Saturday 25th February 2017
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AstonExige said:
Cars back and running great. It was a cracked intake pipe that caused incorrect fuel air mixture, made the car run like a dog and a load of unburnt fuel to collate in the car and ignite. Explains the o2 readings as well.

So nice and relieved about that one. Not quite sure what would cause a cracked pipe?
Which pipe?

AstonExige

Original Poster:

661 posts

106 months

Saturday 25th February 2017
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divetheworld said:
Which pipe?
The pipey looking one near the intake? No idea, I'm not exactly mechanically minded, just repeating what Works told me smile

divetheworld

2,565 posts

134 months

Saturday 25th February 2017
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AstonExige said:
The pipey looking one near the intake? No idea, I'm not exactly mechanically minded, just repeating what Works told me smile
Got it. Sounds like item 23 on the pic.


cayman-black

12,625 posts

215 months

Sunday 26th February 2017
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Good news Mark.
Thanks for the info Brent!