1998 Jeep Cherokee fuel injector problems (NEED REALLY BIG

KENNY2424

MEMBER
1998 JEEP CHEROKEE
V8
AWD
AUTOMATIC
130,000 MILES

Yes I have a 1998 jeep grand cherokee with 130,000 miles and my check engine light came on and I started having problems when coming to a stop and around the speed 45-50 it would shake kinda bad, so I decided to take it in and run the codes, well come to find out I had a misfire on cylinder #8 and a fuel injector code so I buy a plug for it and change it and the plug was real bad and I checked the rest and they were very worn almost all the way down so I replaced them all, well I still have the problem, so I buy a new injector for cylinder #8.I still have the problem. I decide to pull the plugs off the injectors and check them with a volt meter on a scale of 1 to 2.5 volts: cylinders 1, 3, 4, and 7 are all pulsating at.5v, cylinders 2, 4, and 6 are pulsating at.5v but number 8 cylinder is not pulsating and has a constant voltage of 2.5volts, I have no idea what the problem is now, can anyone help me out on this?

1 Reply

JDL

MECHANIC
16,098 POSTS

Welcome to the forum, two wire connector at injector, one voltage, more than 2.5, anyway, the wire is ground. The computor controls the ground. If no ground, take circuit connector loose at injector and pcm, check for continuity. If that checks ok, check ground at pcm pin, if no ground pulse, I'd suspect the pcm, wiring circuit, connector, not in that order.