Al 8/4/2010

1990 Buick Skylark Base 4Cyl2.5L - Engine

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I have spark ony on 1 coil pack

The coil pack for cylinders one and four doesnt give a spark. The one for two and does. I jhave changed the coil pack and ignition moduel and still no change.

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  Bobby 8/4/2010

  the problem could be the crank sensor then. The crank sensor and cam sensors sends the signal to the computer for when to fire. You'll want to check for signal voltage coming from the crank sensor and see it is working properly or needs to be replaced.

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  Bobby 8/4/2010

  could also be a bad ground in the ignition circuit. and worst case scenario the pcm is the problem.