1997 Chevrolet Malibu Random misfire

1997 CHEVROLET MALIBU
180,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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JOSHUAFENDER755
  • MEMBER
  • 34 POSTS
I have done the following repairs in a attempt to resolve the random misfire problem
I have replaced:
Plugs and plug boots
Coil Packs
Ignition Control Module
O2 sensors - Both
Fuel pump
Fuel pressure regulator
EGR valve
Crankshaft position sensor
Injectors
Code reader states random misfire.
Misfire is very bad at idle but does not seem to effect the vehicle past 10 mph. Misfire so bad at idle that it may die if I sit at idle for to long. I have replaced every system that I can think of that could be involved in the problem, I am so confused please help
May 12, 2014 at 4:13 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check for a vacuum leak then check compression if both of those ok let a pro diagnose as these are extrememly hard to diagnose and a scanner needs to be hooked up to see what sensor is making it do this as there are several that willmake it do this.
May 12, 2014 at 5:11 AM
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