2002 Jeep Grand Cherokee Engine running and shifting

2002 JEEP GRAND CHEROKEE

140,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC

RON ROSS

MEMBER
1 POST
FOLLOW

Engine is not running smooth, multiple cylinder misfire 1,2,4,5; control circuit #4 injector output driver does not respond properly to the control signal, Throttle Position Sensor w/low voltage, trans. temp. no rise after start and voltage to high, governor pressure above 3 PSI in gear with 0 MPH. Fuel is good Hi Test, checked for water,OK. What could all this mean? Maybe disconnect battery to reset OBD?

Image (Click to enlarge)

Feb 6, 2015 at 3:52 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

CADIEMAN

AUTOMOTIVE REPAIR CONTRIBUTOR
3,544 POSTS

try checking all vacuum hoses. put a gauge on it and make sure it has 18 pounds at least and replace the injector.for starters

Feb 6, 2015 at 4:55 PM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,189 POSTS

the clue is the "control circuit #4 injector output driver" which means you have a shorted fuel injector, I would swap it out and then clear the codes it should fix the problem. Here is how to do the job. Check out the images (below). Please let us know what happens.

Images (Click to enlarge)

Jul 18, 2024 at 6:26 PM