The throttle body may accumulate an oily, black residue in the bore and on the throttle plate causing hard starting or possibly stalling when coming to a stop. The throttle body should be cleaned during regular maintenance but do not spray cleaners directly on or at the throttle position sensor (TPS) as this can damage the sensor.
Engine Performance Problems Due to Residue on Throttle Bodies on Jeep Wrangler
Average mileage: 166,500 (90,000–243,000)
Exhaust & Emissions affected: 2.5L 4 Cylinder, 4.0L 6 Cylinder
20 people reported this problem
1 person shared problem details
2003 Jeep Wrangler90,000Visitor
I have not found a solution
engine turns over tries to fire-up but won't.you can spray starting fluid in it and it will run...
put new engine in 1998 jeep wrangler 2.5 4 cylder new water pump radiater thermostat belt afte...
Ignition wire failures can cause a rough idle or intermittent engine misfire and there mig...