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03-10-2015, 03:08 AM | #1 |
Registered User
Join Date: Oct 2008
Location: los angeles ca
Posts: 220
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Engine light will not flash any code???
Friend has a 1990 GMC 2500 5.7 ltr. Th400 which has the engine service light on. A scan tool does not work and when I jump the a and b connections where you plug in the scanner to pull the codes, it just flashes once rather than flashing the 12 code which I believe tells you it is communicating correctly and then will spit any trouble codes thereafter.
I pulled a spark plug because the truck feels like it is skipping (engine still feels very strong) and the plug is black so I it seems like it is in a rich condition. Anyone have a problem like this or know of a thread that I could read for some ideas where to go? Thanks for any help. |
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