Notices
1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

1996 C3500 7.4 No Spark from Coil

Thread Tools
 
Search this Thread
 
Old April 11th, 2022, 9:37 PM
  #1  
CF Beginner
Thread Starter
 
THase89's Avatar
 
Join Date: Apr 2022
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default 1996 C3500 7.4 No Spark from Coil

Started with random dying when idling or driving but would immediately restart. Now it won’t start at all. Have confirmed no spark coming out of ignition coil.

ICM New (Delphi). Confirmed signal from PCM, 12V power with key on, Ground. All ok.

Coil New (AC Delco). Confirmed 12v power wire with key on, signal from ICM good and tach wire isn’t grounded somewhere (severed for testing purposes)

Crank Sensor New (AC Delco). Confirmed 12v power and continuity between VCM plug and pink and yellow wires. Also have RPM signal with scanner.

I have checked all fuses. Good. I have confirmed VCM ground at thermostat housing. Clean and tightened battery connections. Cleaned and tightened ground at FR side of engine block.

Fuel pressure good @ 55 PSI.

I am now lost at where to go. Everything to tell the coil to fire is there. It just isn’t. (Tried multiple coils and 3 ICM just in case).

Can the ignition switch wiring can any way shape or form affect the coil not sparking?

Ideas please before I sell it for beer money 😁
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Chevygirl93
1988 - 1998 (GMT400)
19
April 22nd, 2023 2:46 AM
bakerb
1988 - 1998 (GMT400)
5
January 5th, 2022 11:57 PM
Chevygirl93
1988 - 1998 (GMT400)
16
September 7th, 2020 4:57 AM
Big Red
Show Off Central
9
August 25th, 2019 5:43 PM
JDMonster
K5 Blazer
2
April 22nd, 2012 4:20 PM



Quick Reply: 1996 C3500 7.4 No Spark from Coil



All times are GMT -5. The time now is 10:35 PM.