The throttle position sensor (TPS) may fail causing intermittent drivability problems like hard starting, stalling, and/or hesitation when accelerating. A failed TPS will require replacement, proper diagnoses should always be performed before replacing any parts.
Resources for the Repair and Maintenance of your 1990 Jeep Wrangler
1990 Jeep Wrangler
1990 Jeep Wrangler Problems
Engine oil leaks from the valve cover gasket, oil pan gasket and timing cover gasket are common.
Some models are susceptible to rear main oil seal failures in dirty or dusty conditions. As dirt and dust collect on the oil seal, the abrasion wears through the sealing surface. A spacer is used between the bell housing and engine that has a small slot in the 12 o'clock position. Filling this slot with RTV silicone and cleaning the seal area can help prevent damage to the seal.
Due to warped front brake rotors or variations in the thickness of the rotors, brake pulsations may develop. The best method to reduce pulsations is to use an "On the Car" brake lathe (as long as the rotors are suitable for turning). "On the Car" equipment can correct variations (or "runout") in the rotor surfaces because it also corrects variations in other components (e.g. the hub).
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.
1990 Jeep Wrangler Recalls (Recent)
Summary: BESTOP AFTERMARKET REAR SHELL ROOF RACKS,MANUFACTURED BETWEEN APRIL 27 AND MAY 20, 2004, DESIGNED FOR USE WITH THE BESTOP HARDTOP MADE FOR THE 1986-1995 AND 1997-2003 JEEP WRANGLER. THE COCKPIT COVER MAY NOT STAY LATCHED TO THE ROOF RACK BECAUSE THE LATCH BRACKET MISPOSITIONS THE ROTARY LATCH TO THE COCKPIT COVER. AS A RESULT, THE COCKPIT COVER MAY NOT STAY LATCHED TO THE ROOF RACK AND COULD SEPARATE FROM THE ROOF RACK. THIS RECALL ONLY PERTAINS TO AFTERMARKET REAR SHELL ROOF RACKS AND HAS NO RELATION TO ANY ORIGINAL EQUIPMENT INSTALLED ON JEEP WRANGLER VEHICLES BY DAIMLERCHRYSLER.Learn more »
Summary: ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH MANUAL TRANSMISSIONS, THE PARKING BRAKE CAN SELF-RELEASE WITHOUT WARNING.Learn more »
Summary: VEHICLE DESCRIPTION: PASSENGER AND MULTI-PURPOSE VEHICLES ORIGINALLY SOLD OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, ILLINOIS, INDIANA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, OR WISCONSIN, AND THE DISTRICT OF COLUMBIA. THE FRONT DISC BRAKE ROTORS CAN EXPERIENCE SEVERE CORROSION IF OPERATED FOR AN EXTENSIVE PERIOD IN THE "SALT BELT." IF THE ROTORS ARE NOT REPLACED, THE CORROSION CAN EVENTUALLY COMPROMISE THE STRUCTURAL INTEGRITY OF THE STAMPED STEEL CENTER HUB SECTION OF THE ROTOR.Learn more »
Summary: ON 1987 THROUGH EARLY 1990 MODELS, BOTH FRONT BRAKE HOSES CAN WEAR DUE TO DIRECT CONTACT WITH THE WHEEL OPENING SPLASH SHIELDS. ON THE LATE 1990 THROUGH 1992 MODELS, PERIODIC RUBBING CONTACT OF THE LEFT FRONT BRAKE HOSE CAN OCCUR DUE TO MOVEMENT OF THE SPLASH SHIELD IN CERTAIN VEHICLE OPERATING CONDITIONS.Learn more »
1990 Jeep Wrangler Questions and Answers
How too find and purchase a charcoal canister?
Why is engine sputtering at high speeds? Oxygen censor has been replaced, tune-up has been done. Thank you if can help
My car is overheating - I was told by a AAA garage that I needed a new radiator , however that was based on them seeing aleak. I took the car to pepboys (mistake) they said that I needed a new wa...
tested ignition wire for spark when cranking, no spark. is the problem the ignition coil because wires test ok, or is there an engine control module at fault?