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Won't start-no spark on 3.1

Tiny
XXXTINA63
  • MEMBER
  • PONTIAC GRAND PRIX
I have a 1990 Pontiac Grand Prix with a 3.1 v6 and auto w/overdrive. The car had been running fine, but the other morning it refused to start. Would turn over but not fire. Upon looking, I found that it has no spark on any of the coils. About 3 months ago, I did replace all 3 coil packs and the control module while trying to diagnose another issue I was having. Feeling that it would be unlikely that all 3 coils would have failed at the same time, and since the control module is under warranty, the parts store exchanged the unit with another new one. I cleaned the connectors on the harness and put it back together, still to have no spark. I have checked all of my fuses and I am getting the proper fuel pressure. Any ideas would be appreciated.
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Wednesday, June 6th, 2007 AT 12:08 PM

4 Replies

Tiny
WADD
  • MEMBER
  • 2 POSTS
I also have a 1990 3.1 GP. Check the crankshaft position sensor and the wiring going to it from ignition control module
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Sunday, February 5th, 2012 AT 8:12 PM
Tiny
MRIFFE
  • MEMBER
  • 4 POSTS
I have a 1997 Pontiac grand Prix 3800 supercharged. Same problem. Changed the crank sensor, ignition modual, harmonic balancer, and a new fuel pump. Also changed the wire that goes from the fuse box to the battery. Still nothing. Any Ideas!
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Thursday, May 24th, 2012 AT 9:23 PM
Tiny
WADD
  • MEMBER
  • 2 POSTS
Check the control module wiring (i believe it is a 6 pin connector)that communicates withe ecm. These wires tell the ecm when the icm has charge of the motor, make sure that DURING CRANKING ignition controlmod is getting 12 volts. CHECK UR injectors. If 1 is shorted ecm will not spark to occur. U can check them with ohm meter
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Friday, May 25th, 2012 AT 12:45 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Check if there are aney codes in the computer. This will give you some direction.
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Friday, May 25th, 2012 AT 1:39 PM

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