Question about 1992 Lexus Ls 400

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When in park or neutral, the idle goes from 1100 rpm to about 2100rpm, but when placed in drive or reverse, it idles fine. when letting foot off gas to coast, it gets up to about 20mph without putting foot on gas. what could this be

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  • Anonymous Mar 29, 2014

    when park idle 2000 rpm and on drive 1100 rpm

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  • 58 Answers

Sounds like a bad throttle position sensor or a vacuum leak Check vacuum hoses for cracks, then TPS for resistance

Posted on Feb 03, 2010

  • Debbie Thomas Oct 15, 2011

    Is that the same as an AIS (automatic idle speed) motor? How do you test for either of those?

  • Debbie Thomas Oct 15, 2011

    Oh, it is a '92 plymouth acclaim

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1 Answer

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