1990 Chevy Truck

1990 CHEVROLET TRUCK
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SCHUMAN_07
  • MEMBER
  • 5 POSTS
Engine Performance problem
1990 Chevy Truck V8 Four Wheel Drive Automatic

I thought it was my timing but I realized it only happens after the truck heats up.......my truck will misfire/backfire when I try to push the throttle more than 1/4 way. When I first start it up in the morning it will run fine though....any thoughts?
Jun 23, 2010 at 5:08 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard
Jun 23, 2010 at 9:35 AM
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