'91 Century Wagon 3.3L/V6: Intermittent spark - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-29-2013, 11:31 PM   #1
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Default '91 Century Wagon 3.3L/V6: Intermittent spark

Hello! Newb to the forum. Got a problem I hope someone can help me with.

Last Saturday I went and started the car to go to work. It was a little hard starting, at first, but started and ran for not even ten seconds and died. It would not start again until a while later. But, then it did the same thing. It ran for less than ten seconds, died, and would not start again. No problems getting the motor to turn over. It just won't fire until a little while later. Haven't exactly timed it, but maybe an hour or so. It'* flooding. I can smell the fuel. Pump is definitely working. Pressure regulator doesn't seem to be leaking through the diaphragm. Problem is the spark is intermittent. When it dies there is no spark until I've waited. It'* like it'* "timing out" or something. Maybe something is warming up and then shuts off once it'* heated up a little? Like an ignition component?

I'm much more familiar with early EFI Toyotas. Kind of at a loss on this one. I've located the crank sensor and the plug is clean with good connection. I can test it, but I don't know what the ohm specs should be. All I have is a Chilton'* manual. It sucks for anything more than the very basics.

Any help would be much appreciated! Thanks!
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Old 10-29-2013, 11:43 PM   #2
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My money is on the ignition control module. Here is a step by step test.
https://www.gmforum.com/trouble-shoo...m-test-299761/
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Old 10-30-2013, 12:37 AM   #3
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Quote:
Originally Posted by 75 racer View Post
My money is on the ignition control module. Here is a step by step test.
https://www.gmforum.com/trouble-shoo...m-test-299761/
Thank you. I will go over the link and run some tests tomorrow!
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Old 10-30-2013, 12:40 AM   #4
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Wait. The author states ".....as long as this is a 3.8." Does this test still apply? Will the values and wiring be the same?
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Old 10-30-2013, 12:49 AM   #5
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The 3.3 is basically the same. Should be fine
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Old 10-30-2013, 03:56 AM   #6
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Okay. That'* great. Thanks!
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Old 10-30-2013, 10:33 PM   #7
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Well, it rained all day. So, I wasn't able to get to the Buick. I'll have to wait until Friday and will report results then, if you should be interested.

Thanks [email protected]
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Old 11-08-2013, 05:35 PM   #8
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testing.......
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Old 11-08-2013, 05:41 PM   #9
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Forgive the above post. My first attempt at posting this wouldn't go through. And, I don't see any way to edit on this forum???

Anyway....

Finally found the time and dry weather to test today. I set my DMM to 20v/DC. I used a straight pin to probe wires upon the suggestion of a mechanic in lieu of having actual wire probes. I tested my meter directly to the battery to confirm accuracy and got 12v'*. With a pin probing the power supply wire to the ICM and black meter probe on the neg batt term, I only got .2v'*. I take that to mean insufficient power to the module. Ignition switch, perhaps? Maybe I should confirm that reading by removing the harness from the ICM and testing directly at the connector?
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Old 11-09-2013, 02:27 PM   #10
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they dont want people coming back and erasing things, i guess its been a problem.

as far as the icm i would check it with the plug off the icm because sometimes using a pin is a little shakey. you could have a bad fuse i dont have a diagram for that car.
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