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1996 Jeep Grand Cherokee OBD code

Tiny
HERNS52
  • MEMBER
  • 1996 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
My daughter's check engine light is on and it says that 5 out of 6 cylinders are misfiring. It has been recently tuned up, new plugs, wires, rotater and cap. Runs smooth, no apparent misfire. It won't pass deq with this reading, a friend looked at it and said he thought it was a false reading but had no idea what was causing it.
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Wednesday, December 9th, 2015 AT 5:25 PM

4 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
I would check the fuel system. Check fuel pressure, fuel filter, and maybe try running a fuel system cleaner. Could even trying using seafoam to decarb the intake system.
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Wednesday, December 9th, 2015 AT 7:40 PM
Tiny
HERNS52
  • MEMBER
  • 3 POSTS
Seafoam? What is that and how do I use it?
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Wednesday, December 9th, 2015 AT 7:49 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Seafood is fuel additive, crankcase additive, and/or induction cleaner. You can buy it any parts store or walmart etc. I would suggest that you google it to understand what it is and search on youtube to see how it is done. It will be a lot more helpful than for me to try and explain it. I attached a photo.
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Wednesday, December 9th, 2015 AT 7:57 PM
Tiny
HERNS52
  • MEMBER
  • 3 POSTS
Thank you for your help.
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Wednesday, December 9th, 2015 AT 7:59 PM

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