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1996 Chevy Astro rough idle

Tiny
CHEVYDAN875
  • MEMBER
  • 1996 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
Hi I have a 96 chevy astro with 200000 miles. Its a great truck, but I keep getting a cylinder 3 misfire. It idles rough and has a smell of raw fuel. I have changed everything I can think of. IE. Injectors (spyder), fuel filter, plugs, wires, cap, rotor, distributer, egr valve, mass air flow censor, air temp censor. Compression is good around 150 on all cylinders. Please help.
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Thursday, June 10th, 2010 AT 2:44 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you inspect the no.3 poppet valve? Also the camshaft position sensor side of the distributor

Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors/circuit
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Thursday, June 10th, 2010 AT 6:34 PM

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