Question about 1988 GMC S-15

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Service engine light

1989 s15 2whdrv 2.5lt engine light on sometimes ,when its on the engine sputters a bit,i have changed everything that has to do with egr system ,still have problem.

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On your particular vehicle, you should be able to pinpoint your problem rather easily. Locate your diagnostic port underneath your dash. Once your located your diagnostic port, use a paper clip as a "jumper" between the two terminals on the top, right-hand side of your diagnostic port. once you have the paper clip in plac, turn your ignitiong to the "On" position, NOTE: MAKE SURE NOT TO TURN THE IGNITION TO THE "START" POSITION WHILE DIAGNOSTIC PORT IS BEING JUMPED. Upon turning the key to the "On" position, you should be able to could the number of times the check engine light blinks.

  1. The code(s) stored in memory may be read through counting the flashes of the dashboard warning lamp. The dash warning lamp should begin to flash Code 12. The code will display as one flash, a pause and two flashes. Code 12 is not a fault code. It is used as a system acknowledgment or handshake code; its presence indicates that the ECM can communicate as requested. Code 12 is used to begin every diagnostic sequence. Some vehicles also use Code 12 after all diagnostic codes have been sent.
  2. After Code 12 has been transmitted 3 times, the fault codes, if any, will each be transmitted 3 times. The codes are stored and transmitted in numeric order from lowest to highest.
Hope this helps! Have a great day!

Posted on Nov 23, 2008

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Hi patroy376408,
First of all what diagnostic trouble code/codes are you getting?
Also why did you replace all components of egr system?

Thanks

Posted on Nov 23, 2008

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