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'05 3800 motor won't start-no spark

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Old 04-04-2009, 02:46 PM
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Default '05 3800 motor won't start-no spark
ran fine one day won't start the next, cranks ok
. diagnosis machine showed no code, no spark from coils, coil module tested ok, fuel pressure ok

where to start? crank sensor or coil module
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Old 04-04-2009, 03:08 PM
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you can test your coil packs https://www.gmforum.com/t278818/
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Old 04-04-2009, 03:29 PM
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Does your car have a VATs? If so, try a different key.
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Old 04-06-2009, 06:09 PM
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checked coil packs, 1-4 tested 1.0-1.1, 2-5 tested 0.7 and 6-3 tested 0.7 should I replace 1-4 pack or would it make a difference?
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Old 04-06-2009, 06:21 PM
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Originally Posted by wheatboy
should I replace 1-4 pack or would it make a difference?
I think the difference between this pack and the other two would warrant a replacement.
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Old 04-06-2009, 07:03 PM
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It'* best to have the coils all very close. You will have to check yoru new one as well to see how balanced they are.
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Old 04-06-2009, 08:59 PM
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Whats? a VATs
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Old 04-06-2009, 09:01 PM
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Anti theft system
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