2004 Grand Am is down 2 cyclinders. Replaced PCM but is still misfiring on one cyclinder. Fuel injection appears to be working. What is going on?

Lisa Norton

Asked by Apr 20, 2016 at 03:26 PM about the 2004 Pontiac Grand Am GT

Question type: Maintenance & Repair

6 Answers


NEW battery (cause yours is almost 10) new battery cables (if you cannot clean the corrosion with a wirebrush) and assure the bolt that connects the cable to the engine is free of corrosion and the one that connects to the chassis is free of corrosion~ with RESTORED 12.5 volts we will have a shot at the car working correctly~


Interstates are Good...my dad removed the LEAD from automotive battery design...yay~ but test with a multimeter...should have 12.5 volts ....cannot expect a LOAD test these days because the tin/antimony alloy design does not recharge very easily...in fact hardly at all towards the end of it's life~ so would check the voltage at the ECU..make sure that it's got the full 12 volts~


wirebrush connections to the motor block and to the frame/chassis~ this will make a difference in available amperage~

Lisa Norton

This is not the problem; but thanks for your input. Anyone else have any suggestions!


Cracked distributor cap...not done LIsa...just questioning your power situation...cracked distributor may lead to TWO dead cylinders~

Lisa Norton

This ended up being a broken valve spring on cyclinder #2! Got the right mechanic who diagnosed it in less than 24 hours. I'm back behind the wheel!

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