Question about 1990 Toyota Cressida

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Loping and high idle

I have a 1990 Toyota Cressida that idles between 1500 rpm to 2000 rpm. Not able to get idle down due to it being controlled by the computer. I cleaned the PVC tubes from valve covers to the throttle body and in the valve covers. Changed the air filter.Checked for vacuum leaks and found none.My question is would the throttle position sensor cause this problem (loping and high idle), or blocked passages in the throttle body itself ?Any suggestions appreciated.

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  • Anonymous Mar 15, 2014

    I have changed IACV with factory Toyota, changed Air/fuel sensor(first o2) changed rear o2 sensor, cleaned MAF, did a compression check and replaced the ECT sensor. Idle still lopes from 1300-1700 rpm. Truck drives fine, just wont idle right?? I have a OBD 2 reader

  • Anonymous Mar 27, 2014

    4 cylinder engine just started making a low pitch roaring noise when idling down from about 2000 rpm to idle. Just replaced water pump about a year ago. Pretty sure its not that. Sounds like it coming from the front of the engine under the valve cover.

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You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016

Posted on Oct 26, 2008

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