CEL
06-22-2018, 12:56 PM
#1
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Location: Dutchess county NY
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Year: 2004
Model: Grand Cherokee
Engine: 4.7
CEL
My check engine light has been on due to a cylinder 2 missfire for quite some time...last Thursday i went to the car wash and Saturday the light went off..no codes...its been off ever since!!! WTH
06-22-2018, 08:21 PM
#2
Old fart with a wrench
It probably was carbon buildup on a spark plug that eventually burned away. Problem gone, no light.
06-22-2018, 10:32 PM
#3
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Location: Dutchess county NY
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Year: 2004
Model: Grand Cherokee
Engine: 4.7
Light was on ...changed plugs....light was still on for about 6 months...all of a sudden light is now off
06-23-2018, 12:01 AM
#4
Old fart with a wrench
It will stay on for a period of time until the PCM decides the problem won't occur again, then it turns it off. OR you can clear it with a scanner when you fix the problem. I tend to read the codes, write them down, then clear them and see if they repeat. I've got one 02 sensor with an intermittent heater. The sensor is functioning but about once every 2 or 3 months it sets a code for the heater. It could be a bad connection in the plug but I haven't checked it yet. You can get a good scanner for around $100.
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