Question about 1992 Chevrolet G20

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I am helping a friend fix up his 92 G20 5.7L Conversion Van and he has had the throttle body injectors/ bridge replaced with a used one. There has been a full tune-up performed, including coil. New vacuum hoses and apparently no vacuum leaks. The van starts and immediately goes into a surging idle. Upon throttle opening, holding at a constant position, the engine will not accelerate fully for several moments and then accelerates slightly and begins surging again. The van has terrible power, almost dying. I suspect the TPS. I could do to know which wire is the supply wire (assuming 3 wire harness) and most importantly, what the resistance is to adjust it manually (or an easier approach), assuming it is functioning. Thank you, Justin Sosnowski

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No resistance to check or adjust, with key on, one wire will have 5.0 volts, the next one should have about .50 (1/2) volt give or take .10 volts, the last wire is ground, check with volt meter, connect ground from volt meter on to battery ground, and probe with pos. probe, the wire with 5 volts is out put from ECM, and the one with .50 volts is in put to ECM, to check TPS, on the wire with .50 volts, as you open throttle voltage should go up to 5.0 volts, with no drop in voltage, as you open throttle, if there is voltage drop, bad TPS, to adjust, on wire with .50 volts, with key on, engine off, should read .50 volts, if more or less volts, loosen screws on TPS and adjust to .50 volts, hope this was very helpful.

Posted on Sep 15, 2010

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