miss fire help
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1st Gear Member
Joined: Mar 2008
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miss fire help
ok i have a 98 v6 camaro stock,car runs fine if you dont push it, but if i get on it, it bucks and missis, and throw a code. code says it atnumber 4 cylinder,so i switch coils around and it missed again at the same cylinder?? i just replaced the wires and plugs so i dont think its that? could it be the imc going bad? any clues would help thanks
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: miss fire help
One more time.
There are 3 main reasons for misfire.
1) Ignition problems causing weak or no spark: spark plugs, ignition wires, ignition coil/s, ignition control module, spark timing, etc..
2) Fuel delivery causing too lean or too rich fuel mixture: injector not being fired, bad injector, bad fuel pressure, any sensors involved with A/F ratio (O2, MAF, ECT, AIT), clogged filters, etc..
3) Mechanical problemsresulting in low cranking compression: Burnt valves, valve train damage, blown gasket, broken piston, wiped out cam lobe,etc..
Helpful tools: Scanner, fuel pressure gage, compression gage, multimeter, NOID lights, spark tester.
There are 3 main reasons for misfire.
1) Ignition problems causing weak or no spark: spark plugs, ignition wires, ignition coil/s, ignition control module, spark timing, etc..
2) Fuel delivery causing too lean or too rich fuel mixture: injector not being fired, bad injector, bad fuel pressure, any sensors involved with A/F ratio (O2, MAF, ECT, AIT), clogged filters, etc..
3) Mechanical problemsresulting in low cranking compression: Burnt valves, valve train damage, blown gasket, broken piston, wiped out cam lobe,etc..
Helpful tools: Scanner, fuel pressure gage, compression gage, multimeter, NOID lights, spark tester.
Thread Starter
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1st Gear Member
Joined: Mar 2008
Posts: 260
From:
RE: miss fire help
ORIGINAL: z28pete
One more time.
There are 3 main reasons for misfire.
1) Ignition problems causing weak or no spark: spark plugs, ignition wires, ignition coil/s, ignition control module, spark timing, etc..
2) Fuel delivery causing too lean or too rich fuel mixture: injector not being fired, bad injector, bad fuel pressure, any sensors involved with A/F ratio (O2, MAF, ECT, AIT), clogged filters, etc..
3) Mechanical problemsresulting in low cranking compression: Burnt valves, valve train damage, blown gasket, broken piston, wiped out cam lobe,etc..
Helpful tools: Scanner, fuel pressure gage, compression gage, multimeter, NOID lights, spark tester.
One more time.
There are 3 main reasons for misfire.
1) Ignition problems causing weak or no spark: spark plugs, ignition wires, ignition coil/s, ignition control module, spark timing, etc..
2) Fuel delivery causing too lean or too rich fuel mixture: injector not being fired, bad injector, bad fuel pressure, any sensors involved with A/F ratio (O2, MAF, ECT, AIT), clogged filters, etc..
3) Mechanical problemsresulting in low cranking compression: Burnt valves, valve train damage, blown gasket, broken piston, wiped out cam lobe,etc..
Helpful tools: Scanner, fuel pressure gage, compression gage, multimeter, NOID lights, spark tester.
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