WHY WON'T IT START?

  • Tiny
  • Christinate
  • 1996 Pontiac Grand Am
  • 120,000 miles

Car has been running well. Parked it and came out the next morning and engine would crank over, but would not start. Have determined that engine is lacking spark and fuel. Upon key on, I hear the fuel pump run, along with everything else powering up ok. All fuses ok, including the pcm and ign fuse. Have replaced the coil pack along with the ignition module and crank sensor, but with no change. Ignition module getting the 12 volts at the 2 pin conn. On left side. Crank sensor ohmed out at 901 and with engine cranking was getting 1.1 volts. All grounds look good. Unplugged map sensor, no change.
Wondering what to look at next?

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Friday, December 30th, 2011 AT 4:18 AM

15 Replies

  • Tiny
  • fixitmr
  • Member

What motor?

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Friday, December 30th, 2011 AT 4:52 AM
  • Tiny
  • Christinate
  • Member

3.1

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Friday, December 30th, 2011 AT 7:17 AM
  • Tiny
  • fixitmr
  • Member

Some testing help here. http://troubleshootmyvehicle.com/gm_ckp_3.1L_3.4L/ckp_sensor_test_1.php

http://easyautodiagnostics.com/ignition_gm/ign_module_test_1.php

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Friday, December 30th, 2011 AT 7:40 AM
  • Tiny
  • Christinate
  • Member

Thanks for your help, but the ignition module and crank sensor has already been replaced prior to your post on testing them. Any other clues?

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Sunday, January 1st, 2012 AT 3:05 AM
  • Tiny
  • fixitmr
  • Member

You checked ignition module ground wire next to hot?

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Sunday, January 1st, 2012 AT 3:45 AM
  • Tiny
  • Christinate
  • Member

Yes, we have a good ground on that side.

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Sunday, January 1st, 2012 AT 4:12 AM
  • Tiny
  • fixitmr
  • Member

Did you test CKP pulse at ignition module?

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Sunday, January 1st, 2012 AT 4:34 AM
  • Tiny
  • Christinate
  • Member

Yes, around 1v cranking the engine and it ohm'd out at 900ohm

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Sunday, January 1st, 2012 AT 4:41 AM
  • Tiny
  • fixitmr
  • Member

And still no spark?

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Sunday, January 1st, 2012 AT 4:55 AM
  • Tiny
  • Christinate
  • Member

Correct, no spark. Everything leads to the module in my mind, but I have tried two different ones.

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Sunday, January 1st, 2012 AT 5:14 AM

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