 No spark, ECU Comm Error? 90 AWD TSI |
 May 23 2005, 07:58 PM
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Info Seeker  Group: Members Posts: 80 Joined: 6-November 02 Member No.: 38  |
Im having a problem with my 90 tsi awd, its got a new rebuilt motor in it and the caps have been replaced like last month. After the rebuild the motor would start but sputter out of the exhaust, so we had the ecu caps replaced. And now the car will not even start. We have fuel, but no spark. The timing marks are all aligned. We have replaced the power transistor unit and also the coil pack, but we have no spark still. The mpi fuse checks out good also, we do not have a clue on what to check next. When we plug in the pocketlogger, it says ECU COMM error, dunno if that could be it. The crank angle sensor used to have to be turned all the way advanced to get the car to run, but now of course the car wont start, so can a bad CAS cause no spark? I am lost, help me!
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May 23 2005, 09:04 PM
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#2
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
CAS does control spark, yes. I believe it does control fuel as well so it may or may not be the problem your having. I'd start with the ECU and then look towards the CAS.
-------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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May 24 2005, 06:55 AM
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 Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
The crank angle sensor has a different error code. Could still be the CAS but my money is on the ECU. Sometimes if the caps weren't replaced timely enough the electrolytic fluid will eat through some of the circuits...
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May 24 2005, 03:42 PM
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 Post Master Group: Members Posts: 780 Joined: 14-July 04 Member No.: 338 |
Also, and I'm not trying to step on toes here, there could be the chance of damaging something else on the ECU when you swapped out the caps. It's easy to overheat a component on a circuit board with a soldering iron. But as Nate said, its more than likely the fliud from the caps.
-------------------- QUOTE (gsxracer80 @ Oct 31 2006, 12:41 AM)
thanks hcar.... I am still massaging that area trying to get it ready...  |
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May 24 2005, 04:51 PM
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#5
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Info Seeker Group: Members Posts: 80 Joined: 6-November 02 Member No.: 38 |
damn i wish i was located more towards you guys
 im in mattoon, which its tough to find others with a 90 turbo around here, i will see what i can find though, thanks a ton
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