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Timing a 1995 GMC C2500 7.4 L.

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Steve F.
New User

Dec 9, 2014, 8:14 PM

Post #1 of 4 (3135 views)
Timing a 1995 GMC C2500 7.4 L. Sign In
   I cannot find, after exhaustive searching, the EST connector, on my 95 GMC 7.4L, in order to check the timing, can I jump the ADL link, instead, if so, which pins, Thank You.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 9, 2014, 9:34 PM

Post #2 of 4 (3127 views)
Re: Timing a 1995 GMC C2500 7.4 L. Sign In
Quote
Put the IC system in the bypass mode by disconnecting the "set timing" connector. This is a single wire sealed connector that has a tan with black stripe lead. This connector breaks out of the wiring harness below the heater case in the passenger compartment.
Base timing is 4 degrees BTDC.

Jumping the ALDL won't put the ignition control module into base mode.





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


Steve F.
New User

Dec 9, 2014, 11:00 PM

Post #3 of 4 (3119 views)
Re: Timing a 1995 GMC C2500 7.4 L. Sign In
   I know it's supposed to, but like I said, I just cant find it there.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 10, 2014, 3:50 AM

Post #4 of 4 (3111 views)
Re: Timing a 1995 GMC C2500 7.4 L. Sign In




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