Question about 1993 Buick Roadmaster

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I tried to adjust the idle speed by turning the screw on the tbi and now I can`t set the correct tps voltage or the correct idle speed.the car stalls at 5.4 and only 1200 rpms can stop that from stalling. Should it be 5.8v and 750 rpms? 1993 buickroadmasetr estate wagon 5.7l

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  • iron duke May 15, 2009

    I used a scan tool to check the tbs on a working vehical and it read 5.8v and 700 rpms at idle. I then tried to adjust the tbs on my car and turned the tbi idle screw till it read 5.8v but the car stalled. I runs smooth when I give it the gas but then stalls but always restarts.

  • iron duke May 15, 2009

    yes very..

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Try idleing it back up

Posted on May 15, 2009

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Hi,

Well, TPS should read 0% without any throttle. However, with KOEO, the sensor should fluctuate with the gas pedal. When the pedal is completely up, no throttle, voltage can read as low as .5 or as high as 3.5, but should never read anything near 5V at any time.

If so, it indicates an open on the ground side of the circuit or a short to power.
Therefore Set it at 600 RPM- for the throttle position sensor voltage at closed throttle should be 1.25volts or less. Thank You

Posted on May 15, 2009

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