Rough running 2000 Chevy express 5.7L

Tiny
BOMBASTIC1979
  • 2000 CHEVROLET EXPRESS
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES

I have a 2000 chevy express 2500 w/5.7L. It runs rough. Recently had a full tune up and fuel pump test. Fuel pump is within specs but on low side. No check engine light on. Feels more like a timing/advance problem than a misfire. Any thoughts?

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Friday, June 10th, 2011 AT 8:46 PM

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Tiny
RASMATAZ
  • MEMBER

http://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-

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Friday, June 10th, 2011 AT 9:01 PM
Tiny
BOMBASTIC1979
  • MEMBER

Thanx. I forgot to mention that it is an intermittent problem. Does that change your advice at all?

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Friday, June 10th, 2011 AT 11:00 PM
Tiny
RASMATAZ
  • MEMBER

Yes it does, you got to catch it on the run a tough thing to do

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Saturday, June 11th, 2011 AT 3:32 AM

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