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1994 Oldsmobile Achieva Question: Engine misfires



, 2.3L 4 Cylinder, Lufkin, TX, March 12, 2010, 22:13

The engine misfires intermittently (often). The two coils have been changed out with no change in misfiring. I connected a neon light to each spark plug one at a time and on No. 2 spark plug the neon light flashed twice as bright as on the other 3 spark plugs when the engine misfired. I have hesitated to replace the control module. Any suggestion would be appreciated.... Tommie Watson

2 Answers
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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, March 12, 2010, 22:22

    A professional grade scan tool often displays "number of misfire count" on individual cylinders indicating which cylinders have problems even if not yet flagged as a "PO30x" code. Jaguar and Ford can haev a dead miss due to a bad coil and not flag a code the coil can then work perfect moments later, awful to find the offending code with out a scantool. Are the spark plugs good?

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  • Answer #2

    August 18, 2010, 22:08

    Replaced the spark plug boots and the distributor cap that goes over the sparkplugs - problem solved.
    Tommie Watson

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