I NEED A DIAGRAM OF A CARB FOR A 1989 JEEP LAREDO ITS A FUEL INJECTED SYSTEM.4.0 L ON START UP THE VEH. IDLES FINE BUT AS IT WARMS UP IT STARTS TO REV UP REAL BAD UP TO 2000 RPM. IS THERE A SIMPLE ADJUST MENT OR IS THERE A SENSOR THAT NEEDS REPLACED, I TRIED TO ADJUST THE IDLE SCREW BUT IT CHANGES NOTHING.I LOOKED INSIDE CARB WHEN IT IS RUNNING AND THE BUTTERFLY IS CLOSED.I WAS TOLD THERE IS A SENSOR ON OR IN THE CARB THAT REGULATES THIS. THANKS FOR ANY HELP.
2007-02-16 15:12:49 · 3 answers · asked by ponchohansen 1 in Cars & Transportation ➔ Car Makes ➔ Jeep
first of all, if it is fuel injected, there is no carburetor.
It sounds like it could be the throttle position sensor or the mass air flow sensor. I would focus on these two items.
2007-02-16 15:42:42 · answer #1 · answered by sk33t3r 3 · 1⤊ 0⤋
Look for a vacuum leak first maybe a hose has a break in it or where it slips on to a vacuum port it's broken or off. If everything there is OK i would suspect an idle air control motor (IAC) with controls engine rpm by changing the amount of air allowed through the throttle body.
2007-02-16 16:13:20 · answer #2 · answered by countryboy 3 · 0⤊ 0⤋
try posting here http://www.jeepforum.com/forum/index.php
2007-02-16 15:30:30 · answer #3 · answered by Indiana Jones 6 · 0⤊ 0⤋