Electrical problem
1993 Jeep Cherokee 6 cyl Two Wheel Drive Automatic
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93 Jeep Cherokee w/60K plus on rebuilt motor. When driving, RPM needle gets erratic & then goes to zero & engine stalls for a second or two & then jumps back to normal. Also does this sometimes at idle while in park. Parts replaced so far include: fuel pump, fuel pump relay, auto shut off relay, distributor, ignition coil, pick-up coil. Wires have been traced from fuel pump to motor & replaced pump connector. When driving between 15 - 70 MPH engine feels like it "surges" or "jerks" before RPM's bottom out. Sometimes it runs perfect. Drove 14 miles on highway at 70 mph without a problem, then when I exited the highway, Rpm went to zero & the surging & jerking were so bad I pulled over & shut it down. Always restarts fine & sometimes will drive okay & sometimes problem starts when pulling out of the driveway. Suspected catalytic converter, but previous owner says honeycomb already removed. Ballast resistor has also been bypassed. I suspect a short or ground problem somewhere but don't know where to start checking. Any suggestions on sensors or electrical troubleshooting would be appreciated.
1993 Jeep Cherokee 6 cyl Two Wheel Drive Automatic
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93 Jeep Cherokee w/60K plus on rebuilt motor. When driving, RPM needle gets erratic & then goes to zero & engine stalls for a second or two & then jumps back to normal. Also does this sometimes at idle while in park. Parts replaced so far include: fuel pump, fuel pump relay, auto shut off relay, distributor, ignition coil, pick-up coil. Wires have been traced from fuel pump to motor & replaced pump connector. When driving between 15 - 70 MPH engine feels like it "surges" or "jerks" before RPM's bottom out. Sometimes it runs perfect. Drove 14 miles on highway at 70 mph without a problem, then when I exited the highway, Rpm went to zero & the surging & jerking were so bad I pulled over & shut it down. Always restarts fine & sometimes will drive okay & sometimes problem starts when pulling out of the driveway. Suspected catalytic converter, but previous owner says honeycomb already removed. Ballast resistor has also been bypassed. I suspect a short or ground problem somewhere but don't know where to start checking. Any suggestions on sensors or electrical troubleshooting would be appreciated.
Sep 1, 2008 at 1:20 AM