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Car: 1993 Audi 90 I'm trying to recharge my car's A/C and I can't get the compressor to turn on at all, not even once has it turned on. I have tried jumping both the high pressure switch and the A/C relay while the engine was running and got nothing. I'm pretty sure the compressor is not locked...

Inspected the pistons more closely and noticed a crescent shaped imprint into the carbon on the pistons. The imprints are lined up right with the exhaust ports so it must be the exhaust valves that are bent. I guess they're not bent enough to be noticeable, but bent just enough to leak compression..

So I finally got the heads off, and inspected the valves. So I’m not the best judge as I don’t have a lot of engine internal experience, but everything looks good to me. I tested for leaks by pouring acetone on top of the valves and by shining light on them and found nothing. Not sure of how...

Just pulled the cams, the intake valve was lower than the exhaust valve on every cylinder except #4. I put a straight edge on exhaust valve and put a feeler gauge under on intake valve. The difference ranged from 0.65mm up to 0.88mm. I'm not sure how high the intake or exhaust is supposed to be...

Well at this point I'm fairly certain I've bent valves. I redid the timing perfectly. Much better than before (cam locking bar goes in perfectly with crank at TDC). I put the spark plugs back in cranked it over and still zero compression at the compression tester gauge. I cranked the engine for...

Yes it ran before replacement. The more I think about it it really only makes sense that the timing is incorrect. The timing was set with locking bar on camshafts and crankshaft at TDC so there's no way it could be 180 degrees off but I think it could be off a tiny bit which with these engines...

Well I guess I will redo the timing job and go over the procedure again and make sure I've not missed anything. I guess I am too bull-headed to admit I did the timing procedure wrong but it seems I have no choice lol. I am just hoping it wasn't off enough to bend valves. I don't think it was...

It started and ran before I replaced engine parts, but not that well. I noticed timing belt was replaced earlier with mark and pray method, so I decided I would redo it with proper procedure and new parts. I can't see how the timing would be wrong, but I suppose it could be off by just enough to...

I tried that and didn't feel anything, also noticed the engine isn't really spinning fast but the starter sounds like it is. There is no "whoosh" sounds from the open spark plug holes but I can feel the air from them.

Timing belt is good, I just replaced it and I can see it as the engine is missing top timing covers. I tried spraying starting fluid through the throttle body and got nothing. I just confirmed gauge does hold pressure on a different engine. I couldn't get the gauge to even move a single psi on...

Hi I am having a no start condition with my 93 Audi 90 with 12v V6. I have already confirmed I have the basics. I pulled a plug wire from each bank and had spark, and I pulled fuel rail and confirmed I had fuel spray from each injector. Brand new plugs, plug wires and injectors all around. The...