1995 GMC Sierra engine light on

TSAUSTIN1614

MEMBER
1995 GMC SIERRA
V8
4WD
AUTOMATIC
198,000 MILES

I have a 1995 gmc sierra with a 5.7 liter engine. When I start it up cold the engine light comes on and if I lightly press on the accelerator while in park, the tachometer goes to the red line. Also, the speedometer moves. After shutting the engine off 2 to 3 times, and restarting, the engine light goes off and it runs normally.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check engine light on

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.

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Sunday, January 23rd, 2011 AT 10:15 PM

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hello,

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A 12 consists of one flash, a short pause, then two flashes in rapid succession.

After 12 is displayed, any stored trouble s will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All s are displayed 3 times each then a 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

Post codes.

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Sunday, January 23rd, 2011 AT 10:18 PM