1991 Jeep Wrangler Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Jeep Wrangler
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1991 Jeep Wrangler ProblemsDusty Conditions May Cause the Rear Main Oil Seal to Leak
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.
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.
1991 Jeep Wrangler QuestionsWorking on a 91 jeep 4l have no spark did roater and cap and still nothing (1 answer)
will start sometimes after a few trys has fuel but seams like no spark has code 33 i dont have a/c what does the auto stut downrelay afect and could that be the problum have changed the relay, coil, crank sensor
Jeep runs great changed out the electric fuel pump cap rotor plugs wires MAP sensor but does not idle