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Registered
Join Date: Nov 2009
Location: City by the Bay
Posts: 8
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Ignition System Test. Now what?
My 1990 C4 idling is erratic when engine is cold. The idle would drop about 300-400 rpm and back to 900-1000 again. This would cycle for about 10-15 mins. I cleaned the ISV, checked vacuum leaks, replaced cap/rotor and airflow meter as well. But the problem was persistent. Valve job just completed 3K miles ago with new plugs/wires. The last mechanic said the car is logging code 41 and 34 and to just live with it since it runs well when engine is warm. So when I got home I tested the ignition system and here's what I found.
TEST #1: I tested the coils by switching the coil wires from the distributor side. When I disconnect the coil wire #2 from the secondary distributor (away from fender), idle was okay. But when I disconnected the coil wire #1 from the primary distributor, the engine would ping/misfire. I then plugged the coil wire #1 to secondary distributor to see if it would have the same result. The result was the engine would crank but not turn over to start. It didn't matter whether coil wire #1 or #2 that I plugged into the secondary dist. The results were either ping/misfire or no start. Test #2: The next test I did was to unplug the rear ignition module connector from respective coil (leaving the fwd connector plugged), the engine ping/misfires. I then took the fwd connector and plugged it to the rear IM. The result was ping/misfires. It didn't matter which IM I plugged the fwd connector, the result was pings/misfires. (On the other hand when I plugged the aft ignition module connector to fwd or rear IM. The idle was okay.) So do I have a bad coil or a bad secondary distributor? Is the Hall sensor in the secondary dist? Last edited by topzy; 11-13-2009 at 03:23 PM.. |
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11-13-2009, 03:21 PM
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Registered
Join Date: Jun 2004
Posts: 97
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ignition
are you the one that posted this on rennlist? i left my phone number in your box, you are more than welcome to call we can fix this its easy.
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11-14-2009, 01:37 PM
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Registered
Join Date: Nov 2009
Location: City by the Bay
Posts: 8
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ignition system
dutchcrunch,
been having connection issues with rennlist site so i switched over. I couldn't retrieve your info (didn't know which box you're referring to), but I sent you an email via pelican "private" email. Thanks and I really appreciate your help. |
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11-14-2009, 05:00 PM
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