SPONSORED LINKS

2001 Other GMC Models Random missfire

Tiny
JULES77
  • MEMBER
  • 2001 GMC
  • V8
  • 4WD
  • AUTOMATIC
  • 295,000 MILES
Cylinder #4 and #6, missfire.
i changed spark plugs, wires, cleaned the injectures, change the gaskits on the intake manifolt, swich the coils between bank 1 and bank 2, changed the CMP sensore, change the fuel and air filter, and I changed the lifters, and I still have missfire on those two cylinder, , any idea, thx
SPONSORED LINKS
Friday, September 3rd, 2010 AT 7:45 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, September 3rd, 2010 AT 9:51 AM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE

Sponsored links