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1993 Other GMC Models constant check engine light

Tiny
JUNKSTER
  • MEMBER
  • 1993 GMC
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 61,468 MILES
Truck has constant check engine light and will not put any codes out of the computor. I checked it at the aldl connector, nothing, not even a 12. Tried to clear codes by unhooking battery and still same thing.
engine will crank up, but idles very low and when you try to give it gas or put it in gear to move it, it stalls out
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Wednesday, March 31st, 2010 AT 8:09 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
As we don't know if you are trying to get the code correctly this is the way it's done on your vehicle. Cross only the A & B on the ALDL. Turn the key on without starting the engine. And count the flashes, like 1 then 2 that equals a code 12. If you go to trouble code definitions and OBD 1. If it still doesn t' give you a code then check for bad grounds. That should giv eyou something.
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Friday, April 2nd, 2010 AT 3:19 PM

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