1996 Jeep Grand Cherokee Obd code

1996 JEEP GRAND CHEROKEE
250,000 MILES • 6 CYL • 4WD • AUTOMATIC
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HERNS52
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  • 3 POSTS
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.
Dec 9, 2015 at 5:25 PM
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JOHNNYT73
  • CAR REPAIR CONTRIBUTOR
  • 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.
Dec 9, 2015 at 7:40 PM
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HERNS52
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seafoam? what is that and how do I use it?
Dec 9, 2015 at 7:49 PM
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JOHNNYT73
  • CAR REPAIR CONTRIBUTOR
  • 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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Dec 9, 2015 at 7:57 PM
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HERNS52
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Thank you for your help.
Dec 9, 2015 at 7:59 PM