1 AND 4 CYLINEDERS ARE MISFIRING

1995 Pontiac Sunfire

Tiny

khan1234

April, 14, 2011 AT 3:37 AM

I am working on a 1995 pontiac Sunfire with 2.2L engine. The vehicle has 120000miles on it and the 1 and 4 cylinders are misfiring. When I unplug the alternator, the engine runs good with no misfire. I have replace the alternator twice, using parts from two different suppliers. Other parts that have already been replaced include one GM fuel pump and other from the aftermarket manufacture two GM ECM, the crank and cam sensors, the ignition module, the coils, the spark plugs and every other engine management related sensor and switch time two. I have also checked catalytic converter and timing chain. I have removed the entire wiring harness to check it for damage. Some one suggested the processor in the instrument cluster might be to blame, so I changed that too. The engine still has bad misfiring that goes away when I unplug the running right again. Any help would be Greatly appreciated.

FOUND 2124 RELATED QUESTIONS

Mis Fire -

17 ANSWERS
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2 Answers

Tiny

rasmataz

April, 14, 2011 AT 4:04 AM

Check those cylinders compression and injectors

Tiny

fixitmr

April, 14, 2011 AT 4:04 AM

Have you determined if the bad running is a spark or fuel issue?

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