ignition modules - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stretch · 01-04-2001, 11:34 PM

I was just wondering how the ignition modules with different numbers of pins work differently? The 4-pin modules are pretty self-explanatory (pickup coil input, output to coil), but on the other modules there's a connector wire that goes into the cab through the firewall - why?

sadot · 01-05-2001, 07:32 PM

the two are different the 5 pin is without a computer and the 7 pin is with a computer. that is computer controled . a CCC or a C4 system

**swervin ervin** · 01-05-2001, 08:47 PM

The 5 pin module is for distributors with the ESC (Electronic Spark Control) system. This is the one that has the wires going through the firewall.

The ESC distributor plugs into a control module behind the glove box. All the ESC does is control spark knock. You will notice the knock sensor screwed into the block in front of the starter.

I have replaced all the mess on my truck with an MSD Pro-Billet HEI distributor.

Hope this helps,

------------------
Mike

1985 Chevy C-10
Mike's 73-87 Chevy Pickup Site

*Fast68Chevy* · 01-06-2001, 02:10 AM

My ESC control box is near the accelerator pedal, mounted in a free-stand-up position.
This is in the 81...

01-04-2001, 11:34 PM	#1
stretch Registered User Join Date: Jul 2000 Location: Ridgecrest, CA Posts: 182	ignition modules I was just wondering how the ignition modules with different numbers of pins work differently? The 4-pin modules are pretty self-explanatory (pickup coil input, output to coil), but on the other modules there's a connector wire that goes into the cab through the firewall - why? __________________ '71 Custom 10 350/TH350/3.73 Holley 650 Dbl. Pump, Headers, HEI *************************** '76 K10 350/TH350/205/12-bolt(R)/Dana44(F) Primer Gray! *************************** '01 Grand Prix GTP - my 260 HP gas sipper! Victory Red

01-05-2001, 08:47 PM	#3
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	The 5 pin module is for distributors with the ESC (Electronic Spark Control) system. This is the one that has the wires going through the firewall. The ESC distributor plugs into a control module behind the glove box. All the ESC does is control spark knock. You will notice the knock sensor screwed into the block in front of the starter. I have replaced all the mess on my truck with an MSD Pro-Billet HEI distributor. Hope this helps, ------------------ Mike 1985 Chevy C-10 Mike's 73-87 Chevy Pickup Site __________________ Mike 1985 Chevy C-10

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01-05-2001, 07:32 PM	#2
sadot Registered User Join Date: Dec 2000 Location: oklahoma city Posts: 2	the two are different the 5 pin is without a computer and the 7 pin is with a computer. that is computer controled . a CCC or a C4 system

01-06-2001, 02:10 AM	#4
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	My ESC control box is near the accelerator pedal, mounted in a free-stand-up position. This is in the 81...



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