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Registered User
Join Date: Jan 2013
Posts: 1
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964 Electrical problem
I have a 1991 964 C4 that has all the instrument cluster lights com on intermittently.
I was on the way to my shop the first time it happened, I thought I'd thrown a belt, but no. Since I was there I had him sort it out. He said it was the alternator and I had him replace it. The motor runs great. A week after I had it back it did it again, so I continued driving it. Sometimes it's fine, other times not. Figured maybe the new/rebuild alt was bad, took it back to shop. My mechanic is baffled. He says now, since the engine is throwing a hall sensor code that it could be the distributor. Any ideas? Thanks for reading, Brian |
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01-06-2013, 07:17 PM
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Registered
Join Date: Jul 2010
Posts: 328
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Check all grounds? How old is the battery?
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01-06-2013, 07:40 PM
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Registered
Join Date: Nov 2010
Location: Missouri
Posts: 2,186
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Sounds like the "christmas tree effect" which is fairly common
Check the connections of coil wires as well as condition of plug wires One way to test is to spray as mist of water on them at night and run the engine..if you see arcing then you need to clean connections and/or replace |
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01-07-2013, 07:30 AM
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Registered
Join Date: May 2003
Location: Detroit (Rock City!)
Posts: 783
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Believe it or not that is often caused by the clock. Search here and also at RennList.
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'90C4 Last edited by porterdog; 01-08-2013 at 11:38 AM.. Reason: word choice |
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01-07-2013, 10:46 AM
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Registered User
Join Date: Jul 2011
Posts: 89
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Christmas tree effect for sure. I've seen it several times myself. It's caused by high voltage sparks from bad coil or spark plug wires, and it's causing hiccups in the engine control computer.
One way to spot this is to park the car in a dark garage with the engine running and open engine compartment lid. A spray can with water helps to get the sparks flying. You'll see the spark, and then the warning light havoc in the dashboard immediately after. Quite spectacular actually... Cheers, Tore |
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01-08-2013, 11:25 AM
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