Hello, I own a 2.0T A4 Quattro sedan with about 187,xxx on the dash, have had very few problems before this, change oil regularly, which it does burn a small amount, normal amount for this engine as I understand.
I was recently was leaving a friend's house, fairly cold, waited for cold start to end, and started driving, oil low sensor was on which was a little weird, since it had been probably 1000 miles since last change. Quickly pulled over and topped off oil, everything sounded fine at that point. Later was stopped at a light in gear (auto😔) and the car simply turned off, no loud noise or warning lights. Turned her back over and everything seemed fine, was able to make it home slow (unsure of power loss as I was driving carefully but def possible). At one point going through a roundabout, I heard a slapping/metal thinking noise from lower engine bay. Next day was able to get her to the shop, car "stalled" three times on the way over, and had a loud ticking noise from the back of the left engine bay, sounded like lifters but 2-3x the noise and intensity. Also noticed oil sprayed around the top of the throttle body, inlet hose with a decent coating on the outside. Wasn't sure where to start, but saw several things indicating HPFP and cam follower and saw some oil around base of HPFP, so bought replacement Hitachi, took out that and cam follower which was honestly really good, very slight wearing, could even put it back in for a while, but replaced it anyway to be certain. Then removed throttle body which was fairly dirty inside, cleaned, replaced gaskets, inside of the intake hose was dry, so called everything good there. Also swapped valve cover gaskets, which had indications of leaking, oil sitting on the gasket, but nothing bad, to get a peak at the cams which were in really good shape, no signs of metal or damage so sealed that back up. Replaced sparks, ignition coils looked good, pcc delete kit so no worries there.
Needless to say, the problems were not affected by my attempts and when the car was started back up, it cold started for about 2 mins, idled fine for about 1 minute, then the heavy ticking came back, with the hood up, I could tell it seemed to be coming from below the head valve somewhere but was definitely on the engine block. After 10 seconds of that ticking the car seemed to choke up and die. Tried to get in with a stethoscope, but the attempt to turn it over for that just ended with engine barely turning over and sputtering out within 5 seconds. Plugged the scan tool back in got several codes, will try to link or post on pictures of head valve and codes. Can't find anything too specifically accurate for my problems, the closest thing I could find was https://www.audizine.com/forum/showthread.php/695668-Community-Diagnosis-stumped-on-2011-Q5-2-0t-with-timing-related-issues. This thread actually seemed fairly on par with what I have going on, codes and symptoms were very similar, however I had no misfires when testing.
Right now my thoughts are timing chain tensioner, possibly camshaft (don't think so due to condition of head and follower), pistons maybe, vacuum pump possibly for the pressure sensors but could also be caused by timing degree which seems really high on the scan.
Honestly just curious to see what people think on this, any advice, tips, jokes to smile through the pain. I want to do this right and not waste money on parts that are perfectly fine still. This is my first Audi so learning as I'm going in a sense, I know this isn't the best starter engine but I very much enjoy the car overall and would love to keep it around as long as I can. If you read all this, thank you very much for your thoughts!
Codes and cylinder head↓↓
First time scanning(before any work): https://photos.app.goo.gl/fSHeF5dZm2rzanAp6
After finishing everything:
https://photos.app.goo.gl/VTNxxHVcv45mW1LZ9
Data stream while running for a short time:
https://photos.app.goo.gl/chuvtPRaVrwsTVhU6
Cylinder head:
https://photos.app.goo.gl/3qE9TANLPkkpqVyz9
Really hope you can view these, please comment if not, I'll fix it ASAP.
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Originally Posted by Werdnawk
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