Check engine light on

Tiny
WCKPET
  • MEMBER
  • 2001 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Light comes on after being run at 3000 rpm's for several miles and stays on. Codes indicate miss fire on cylinders five and six. Mechanic has run cleaner through gas several times but light still comes back on after being cleared and runs at 3000 rpm. Have run it two hundred miles since last cleaning.
Monday, February 26th, 2018 AT 10:38 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon.

Additives in the fuel have very little or no effect.

How old are the tune up parts?
Did he do a compression test on the two cylinders?

Roy
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Monday, February 26th, 2018 AT 3:38 PM
Tiny
WCKPET
  • MEMBER
  • 3 POSTS
Had a recent tune up. Mechanic has not done a compression test.
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Monday, February 26th, 2018 AT 7:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Okay, I would have him perform a compression test in those two cylinders to be sure the cylinders can produce power.

Roy
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+2
Monday, February 26th, 2018 AT 10:12 PM
Tiny
WCKPET
  • MEMBER
  • 3 POSTS
What are your thoughts of what may be wrong?
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Thursday, March 1st, 2018 AT 10:37 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
It may have low compression from bad valves, could be injectors or could be a leaking intake manifold gasket

Roy
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Thursday, March 1st, 2018 AT 10:59 AM

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