starting problem.
06-06-2006, 11:12 AM
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starting problem.
I have a 94 Audi cs 90 v6 non quattro. Problem: engine turns over but won't fire. I have had a full tune up and replaced the coil pack. However at random but more often during damp or wet weather problem occurs. All electric works except engine won't fire up. Could it be the ignition switch which in all fairness is worn or could it be something with the starter or fuse panel located under the hood. Any insight would be nice. Car only has 148k miles on it. I hate to consider getting rid of it because of reliability issues.
06-06-2006, 01:12 PM
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Could be the starter begining to go
I had the same problem with my CQ. It would crank but not fire. Sometimes it would fire and sometimes not. I noticed that when it did fire it cranked a little bit faster. I coudln't find the problem so I took it to a shop to diagnose the problem. They set the timing and gave it a full tune up, replaced the fuel pump and that helped a little, but the problem was still there. All sensors were checked and verified to be OK. Finally the starter died all together and I replaced it and never had the problem again.
The ECU has a minimum cranking speed in order to fire the ignition. A worn starter can't accieve the min speed and causes cranking, but no fire. The cranking speed seems like it should be fast enough, but the ECU won't fire.
Degraded battery cables or power wire to the starter could also cause the starter to spin slower than needed.
The ECU has a minimum cranking speed in order to fire the ignition. A worn starter can't accieve the min speed and causes cranking, but no fire. The cranking speed seems like it should be fast enough, but the ECU won't fire.
Degraded battery cables or power wire to the starter could also cause the starter to spin slower than needed.
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06-07-2006, 05:03 AM
#8
That was the same logic I was using!
Unfortunately the answer is no. There is something about the pump starting from a cold start... My car would NEVER hesitate once I got it running.
The difficult part is that the fuel pump will not throw a CEL code. If you can, put down your rear passenger seat and listen for a very light "buzz" when you turn your key to the ON position.
When my car would start I would hear the buzz, when it wouldn't I would hear silence.
The next time it doesn't start get under the fuel tank and smack it a few times with something solid. When I was "stranded" once this technique worked for me (until I replaced the fuel pump).
Replacing the pump is a little bit of a pain if you DIY but you're looking at a $400 repair if you don't. The pump itself is something like $130.
The difficult part is that the fuel pump will not throw a CEL code. If you can, put down your rear passenger seat and listen for a very light "buzz" when you turn your key to the ON position.
When my car would start I would hear the buzz, when it wouldn't I would hear silence.
The next time it doesn't start get under the fuel tank and smack it a few times with something solid. When I was "stranded" once this technique worked for me (until I replaced the fuel pump).
Replacing the pump is a little bit of a pain if you DIY but you're looking at a $400 repair if you don't. The pump itself is something like $130.
06-07-2006, 11:07 AM
#10
My car had 120k miles on the clock when the fuel pump gave up.
At the very least it will be one thing that will not fail you for another 100k miles. Do the fuel pump; I would almost put money on it!
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