1999 Chevy Suburban P0300 random misfire

Tiny
TURBOVTX8
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Tech just did a lower intake (coolant leak)
Now I get a P0300
Check for Misfires
#2 and #6 are missing firing (no codes)
They are exact miss for miss

New cap and rotor
New plugs
Wire good ( swaped with know good ones)
Cleaned Dist out
Grounds are clean
Thursday, March 11th, 2010 AT 2:42 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following-Inspect and test 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.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
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Thursday, March 11th, 2010 AT 2:53 PM

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