Service engine soon light

Tiny
BENJIMO
  • MEMBER
  • 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

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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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