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1996 gmc no spark


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nugget
New User

Jun 30, 2013, 5:59 PM

Post #1 of 4 (1416 views)
1996 gmc no spark Sign In

1996 gmc 5.7 turns over but no spark. ICM tested OK, replaced coil, replaced CPS, power to ICM, but still no spark ??????


Discretesignals
Ultimate Carjunky / Moderator
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Jun 30, 2013, 6:17 PM

Post #2 of 4 (1404 views)
Re: 1996 gmc no spark Sign In

Where are you checking for spark at? Coil or plugs?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


nugget
New User

Jun 30, 2013, 6:29 PM

Post #3 of 4 (1399 views)
Re: 1996 gmc no spark Sign In

both


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 30, 2013, 6:52 PM

Post #4 of 4 (1389 views)
Re: 1996 gmc no spark Sign In

Trouble codes stored in the PCM?

Do you have access to a scan tool that can read data stream information? If so, you can look at the RPM value while cranking to see if it shows RPM speed.

If you have RPM showing, then you could do a ignition module bypass test to see if you can get the coil to fire. That would eliminate igniter, coil and power/ground to the coil and igniter. Then you would be left with the IC trigger circuit after verifying injector activity.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 30, 2013, 6:58 PM)






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