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
Engine misfires on 1994 Oldsmobile Achieva
by Visitor in Lufkin, TX on March 12, 2010
ANSWER by patrick mannion , March 12, 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?
ANSWER by tfw9ohmy , August 18, 2010
Replaced the spark plug boots and the distributor cap that goes over the sparkplugs - problem solved. Tommie Watson