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2001 Jeep Wrangler Engine starts to miss fire

Tiny
RYS82
  • MEMBER
  • 2001 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 158,210 MILES
After about 30 minutes of driving then sitting at a light the engine starts to miss fire and it wont speed up much. If I cut it off and let it cool down it will crank fine and run fine but when its been running for like another 30 mins or so it will start again. Please any help. I replace the crankshaft sensor and ABS sensor but still happens
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Tuesday, September 21st, 2010 AT 8:17 PM

3 Replies

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.
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Tuesday, September 21st, 2010 AT 8:20 PM
Tiny
RYS82
  • MEMBER
  • 2 POSTS
Thanks for the help but what would you think would cause that problem when the car has been running for a while. It never acts up when I crank it or run to the store and back. Onlys acts up when I drive for about 30 mins or more or even let it sit still and crank. Something gets hot and makes it act up. Please any advise will help. Thanks
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Monday, September 27th, 2010 AT 8:50 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The coil could be the problem=Check the coil's primary and secondary winding resistances
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Tuesday, September 28th, 2010 AT 12:06 AM

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