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SERVICE ENGINE SOON LIGHT

  • Tiny
  • benjimo
  • 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?

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Monday, June 6th, 2011 AT 12:54 AM

1 Reply

  • Tiny
  • rasmataz
  • Member

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

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Monday, June 6th, 2011 AT 1:51 AM

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