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Steve, Service Manager
Category: Chevy
Satisfied Customers: 5494
Experience:  25+ Years experience as a professional working automotive technician; ASE L1 master technician
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1996 lumina: hesitation..park..acceleration..catalytic converter 2yrs

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1996 lumina periodic hesitation on acceleration.when in park explosion sounds on acceleration.replaced catalytic converter 2yrs ago,computor indicates needs replacement again.fuelinjector cleaner helped for need advice


The symptoms you describe are consistent with an ignition misfire condition. If you ahve a spark plug misfiring, or firing at the wrong time, that could cause hesitation during acceleration, a backfire during acceleration, and would eventually cause damage to your catalytic converter because of the unburned fuel going down the exhaust pipe.

There are many possible causes for an ignition misfire; but I would suggest starting by replacing teh spark plugs and speark plug wires. These are tune-up parts that need to be replaced ocasionaly for amintenance anyway. IF this does not resolve the problem, you may want to have your mechanic test the vehicle to see what the actual component is that is failing before buying anything elae. Possible faulty components include the ignition module, ECM, throttle position sensor, an ignition coil, or crankshaft position sensor.

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Customer: replied 9 years ago.