1996 Pontiac Grand Am No Spark

BTDARKMOON

MEMBER
1996 PONTIAC GRAND AM
6 CYL
FWD
AUTOMATIC
151,584 MILES

The first time I drive the car it runs fine. But after I turn the key off and start driving it again It will all at once just shut off. After setting for 5 to 30 minutes it will start up and run again, but will again shut off 1/2 mi to 2 mi down the road. After setting overnight the cycle starts all over. When it shuts off it has no spark. Found burnt spot on ignition switch, replaced, not fixed, found crushed crank sensor wires, replaced not fixed, had ICM tested, good, had good used coils, tried, not fixed. Corrosion on Computer, replaced, not fixed. Disabled Paslock system, by unplugging from key cylinder, not fixed. Got used ICM, not fixed.

Any ideas would be greatly appreciated. Are their any relays that could be overheating and causing this. Spoke to GM and they said no although I found a Ignition Timing relay in the wiring diagram. Could this be the culprit.

4 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

Did you check for codes?
Was the crank sensor replaced?

To me sound as a crank sensor failure

Was this

answer

helpful?

Yes

No

Thursday, May 13th, 2010 AT 5:46 AM

BTDARKMOON

MEMBER
2 POSTS

There are No Codes recorded and yes we did replace the crank sensor, ignition switch and computer. We tested the ICM, and it tested good, but decided to get a used ones that came with coils and replaced it. We disabled the theft system (Passlock). The problem still exists. The only thing that looks off on our scanner is the timing is being retarded -18 and lower. No miss fire, car runs smooth and fast until it just shuts down.