Car Problem Reports

Jeep Wrangler Engine Performance Problems Due to Residue on Throttle Bodies

Jeep Wrangler Problem
19 Reports
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Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006

Exhaust & Emissions Affected: 2.5L 4 Cylinder, 4.0L 6 Cylinder

Average Mileage: 166,500 mi (90,000 mi - 243,000 mi)


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.

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