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2010 Audi A4 2.0T Quartto Misfire

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New User

Jan 13, 2022, 8:39 AM

Post #1 of 2 (322 views)
2010 Audi A4 2.0T Quartto Misfire Sign In

Hi all, I have a 2010 2.0T quartto that I recently brought from the auction. The seller didn't disclose the misfire so yea, I have me a pretty one my hands. Anyways, the car idles and runs rough and the car CEL codes produced a P0300, P0304, P0302, etc... I did a compression test and the results are cylinders 1-3 gaged at 180 psi and cylinder 4 at 40 psi and the no.4 spark plug did even look like it fired, no carbon marking. I did not do a leak down test because I did not have the kit nor air compressor. I began disassembling the cylinder heads and removed the valve cover and exposed the camshafts. I did notice that under the intake cam both lifters for the cylinder 4 were off and one was off from cylinder 3 ( attached a link to the picture below) and were located under the exhaust cam. The exhaust cam looks like it had been grinded down and or sheared. I ordered a replacement exhaust cam. My question is, should I replace the timing drive parts as well? Not sure what cause the lifters to fall off the valves for the intake but could it be a bad timing chain? It doesn't look damaged from what I can see but I have completely taken off the chain or the bottom cover yet. Not sure what to look for even after removal of the chain (sorry, intermediate garage mechanic/car enthusiasts). Also, if it is recommended to replace the timing drive, I would need a timing adjustment as well I assume, correct? Any help you all provide would be greatly appreciated. Thanks.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 13, 2022, 9:44 AM

Post #2 of 2 (308 views)
Re: 2010 Audi A4 2.0T Quartto Misfire Sign In

You need to do more diagnostics and less disassembly right now.

Once you take something apart you lose the ability to do any testing to isolate the problem.

At this point you need to do a leakdown test before you remove anything else.

Being that this is an auction car, you know nothing about it's history or what may have been done to disguise it. I buy a lot of auction cars and you never know what you will find. Some of these people are pretty skilled as disguising issues.

My guess is maybe this thing suffered a timing belt failure and did a lot of valve train damage. It is an interference engine.


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