Having problems with your 1995 GMC Sierra C1500 ?
RPMS TO HIGH AFTER REPLACING THROTTLE BODY FOR GMC 07 TRUCK. VERIFIED NO HOSE LEAKS AND TRIED PROGRAMMING ECM, NO LUCK, WHAT AM I DOING WRONG.
You will need to do a base idle adjustment bridge the diagnostic pin out and the earth pin out black wire and white and black trace(i think) on the diagnostic connector the engine fan should run at any temp and the check engine light should flash this takes out the ecu operation of the vehicle therefore it will be like a carbie(make sure the vehicle is at or close to operating temp) disconnect the IAC connector then adjust the throttle stop screw to get the right base idle 6-800 rpm while slowly blocking off the iac hole inside the throttle body(may stall a couple of times but persist) with this in mind this is also the way to get flash codes from the ecu just with ignition on terms still bridged first flashes are 10s short break then units eg. two flash=20 three flash after= code 23 long break next code and so on 12 is system ok
Repair Help & Product Troubleshooting for 1995 GMC Sierra C1500
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