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 1991 Jeep Wrangler
1991 Jeep Wrangler
1991 Jeep Wrangler Problems
A ticking type noise may be noted from the engine area due to an exhaust manifold that has cracked where the pipes are welded; cracked manifolds should be replaced.
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).
1991 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 »
1991 Jeep Wrangler Questions and Answers
Lot of miles but has been running fine. A couple weeks ago temp hit -37F one night. Since then the engine will turn over but won't start. Antifreeze was good for temp, replaced battery, air ...
When down shifting or going into turns my jeep sometimes shuts off. It restarts with no problem. I also have to pump the accelerator a bit when starting it cold.
thank you how much for brake lines replaced
When 4wheel drive is engaged, but the front two wheels will not engage. It like it's not engaged in the transmisson.
I have a 1991 jeep wrangler, it slipped into neutral and rolled down the driveway landing on a large boulder, the rig ran excellent prior to that and now it is not pumping fuel from the tank at all...
1991 Jeep Wrangler Reviews
I bought my 1991 new almost 20 yrs ago. Drove it all through 48 states, Mexico, and alot of Canada. For the last fifteen years I have used it on Catalina Island dirt roads only. No engine problems still. So I have begun to give the old dude a major overhaul to thank it for all those crazy road trips and harsh driving conditions. Pulled it in to the garage last weekend and I am figuring out all the issues to deal with. Considering I drove it all the time and into the garage that should say it all. Only replaced a few starters, sets of tires, windshield, seat covers and a shamefull lack of tune ups. Taking photos of the whole process, wish me luck.
jeep will not start no power to the coil will roll over fine was always hard to start now it won't start at all please help
What can I say? It's a Jeep and the short wheelbase makes for a stiff ride. I LOVE the torque from the 4.0L HO engine but it eats gas like it's going out of style. Oil leaks everywhere mostly fixed now... valve cover gasket, pinion seals, diff covers, transmission oil pan gasket, and oil cooler lines. After test driving some soft tops I'm really happy with the hard top, it's much quieter and seals much better.