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Old 06-15-2010, 10:00 PM
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#4 fuel injector

#4 fuel injector
I have a 2000 Grand Cherokee 4.7 87,000 Miles
My check engine light came on I got it scanned and it read a problem with the #4 fuel injector. I replaced the injector and everything was fine for 3-4 days and the light went back on. The only code that comes up is # 4 injector. I tried using fuel injector cleaner, replaced the fuel filter and I even switched #1 & #4 injectors with the same results. When the battery is disconnected for 10+ minutes it will go out and I can drive a short distance then it comes back on. Is this a possible computer problem? Any help or insight would be appreciated before I take it to the dealer. Thanks. send help to okcroy@aol.com
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Old 06-15-2010, 11:10 PM
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Re: #4 fuel injector

maybe the harness on the 4 injector
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Old 06-19-2010, 08:27 AM
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Re: #4 fuel injector

you can either use a test light or a noid light to check injector pulse, you should have b+ power on one wire and the other wire should flash/blink when you put a test light on the wire that is the ground side and the computer directly pulsates ground at the injectors. that way you can tell if it is a bad injector, but if all is good check the resistance of the injector with a ohm meter. if that is good computer is bad which they had problem with the heat in the engine compartment and the solder joints for coil driver and injector driver circuits
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