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Old 11-26-2013, 01:17 PM   #1
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Default 3800 no sparky

originaly had code multiple missfires than car ran on a few cylinders for a short period of time. i read this article how to test crank pos sensor and icm both seemed all though proper testing from this article required a osiliscope. anyways i got a deal on the icm and crank position sensor so i replace them both. But before replacing these i tested each coil in the the coil pack. the middle coil was sparking only i re-arranged the coil that was sparking to the top position and it sparked there as well. So it seems that two coils were dead left car for a few days now no coils are sparking. I recieved specs to test the coils in the box for the icm it did a primary resistance test and a secondary resistance test none of the coils were in the range. I am wondering how accurate this test is and kinda wondering why all of a sudden the last coll has no spark. Any ideas if this type of test on the coils is accurate test or any other ideas of no spark
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Old 11-26-2013, 02:07 PM   #2
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Primaries should read between 5K and 8K ohms, secondaries between 0.5 and 0.8 ohms. What are yours testing at?
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Old 11-28-2013, 12:05 PM   #3
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5.2k 0.7 ohm
5.0k 1.2 ohm
5.1k 1.1 ohm
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Old 12-08-2013, 01:23 AM   #4
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Default still no spark

so i replaced all three coils and still no spark
replaced icm and pos crank sensor
any ideas on what to check next wiring from ignition switch? or possibly camshaft pos sensor ??
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Old 12-08-2013, 03:22 PM   #5
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It will still have spark with a dead cam sensor. The cam sensor just gives the ECM a TDC reference for the injection system. I would check the power and grounds to the ICM
https://www.gmforum.com/trouble-shoo...m-test-299761/
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Old 12-08-2013, 06:24 PM   #6
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I checked the power on the ignition feed in terminal Please and ground terminal K . Both checked independently and had around 11 volts from the following reference http://www.justanswer.com/buick/5la0...engine-no.html I tried to test the crank position sensor but my test light was wacky and I didn't have a scope instead I replaced it still no luck not sure what else to try
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