Car Problem Reports

Toyota 4Runner Improperly Adjusted Valves May Cause Emissions Failure/Rough Idle

Toyota 4Runner Problem
8 Reports
Me Too

Model Years Affected: 1992, 1993, 1994, 1995, 1996, 1997

Average Mileage: 187,926 mi (180,000 mi - 195,853 mi)


A rough idle and even an emissions inspection failure for high HC and CO can be caused by improperly adjusted valves. Also, exhaust valves may become to tight which can lead to valve failures. Our technicians tell us that regular valve adjustment inspections are a must.

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