Mechanics

SERVICE ENGINE SOON LIGHT

1995 GMC Van • V8 2WD Automatic • 160,000 miles

My 1995 GMC Rally van with a 5.7 and auto tranny has a SES light on. I tried to pull codes with a paper clip from B to A on the 12 pin obd 1 clip with no luck. Idles up and down and feels like tranny is starting out in second gear unless I manually shift to first. Vehicle speed sensor maybe? Why no code?
Avatar
Benjimo
June 6, 2011.




Try cleaning out the idle air control valve and test the TPS and MAP sennsor to include a fuel pressure check

Rasmataz
Jun 6, 2011.


AD