Audi A6 2.4 (Same as 2.8) Misfire

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02-07-2019, 03:22 PM

#11

CRuby

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Quote:

Originally Posted by 4Driver4

I laugh every time I see that picture. It's been around forever and have solved more issues than we can imagine. I love that it's a kindergarden rendition of the manual. Whoever created it (and I would love to know who did) obviously never thought it would become the authoritative source for cam timing, but it is. The hand drawn picture is the bible; honor it!

Yeah I got it from a guy on Audiforums when I was suffering through my misfire investigation. It was driving me nuts that this issue, being so important, was poorly documented. I had some folks quoting 14, 15, or 16 rollers between teeth. My Bentley manual picture wasn't much help either. Anyway, don't have the A6 anymore, but stop by Audiworld once in a while to pass along the knowledge if I can help out the next guy. FYI, my problem was that prior owner did a timing job & switched the cam chain tensioners L-R to R-L. That's eventually how I learned more than I wanted to know about the Audi timing & that the tensioners are not interchangeable. Every time I had it apart, I was keeping left tensioner on left & right on right, never thinking they were switched beforehand.

Wouldn't it be funny if Bentley did a update & we see that picture in it!

Last edited by CRuby; 02-07-2019 at 03:25 PM.

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02-10-2019, 11:03 PM

#12

Ranch28

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Hello my friends !

I really appreciate your help.

I fround the breakdown...

I remove the O2 Sensor (before catalytic converter) and no more misfire !

I think the catalytic converter is plugged...

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02-22-2019, 12:36 AM

#13

Ranch28

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See this :

https://imgur.com/a/4It3VPc

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02-23-2019, 11:13 AM

#14

johnkk

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By any chance, has the car ever been over-filled with oil? That could cause cat clogging. I didn't think 2.4/2.8's were that sensitive to overfill like 4.2's are, but perhaps that caused the clog. Not sure what your inspection situation is, but you could just replace the second cat with a section of exhaust pipe.