Engine misfires

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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

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in Lufkin TX

Mar 13, 2010

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RepairPal Certified shops can diagnose and repair your 1994 Oldsmobile Achieva. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

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Engine misfires

What is your question?

Visitor

in Lufkin TX

Mar 13, 2010

2 Replies

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patrick mannionon Mar 13, 2010

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?

tfw9ohmyon Aug 19, 2010

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

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Popular Answer

What are the best Oldsmobile repair shops?

RepairPal Certified shops can diagnose and repair your 1994 Oldsmobile Achieva. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.