HEI hook-up need help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70short · 09-21-2003, 01:55 PM

I recently replaced my points setup with A summit HEI and wires. The truck ran much better. About A week and A half latter the truck is running very poorly. Will not idle I crank the idle up to about 1100 just to keep it running and it misses real bad and very rich. I removed the plugs and cleaned them. The plugs are gapped at .040. that was recommended to me by the auto parts store. ACDelco small plugs. Engine is out of A 75-76 chevy truck. I have 12v at my swichable ignition power with the ignition on to the coil. I also had to run new wires for the ignition and power to the HEI coil. One of my questions here is "The only power lead I have running from the fuse block(switchable) is to the posative side on the coil. The old points system had another wire running to the starter?" is this correct. The engine has alot of miles on it and several oil leaks I am trying to chase down. Why would it run good for A week then all of the sudden not. Should I replace my ignition switch itself. I am confussed

lukecp · 09-21-2003, 01:59 PM

If the truck is running super rich, i would suspect it to be a carb problem instead of an igniton problem. As long as you have a full 12v going to the HEI it should be fine.

Maybe there is a piece of dirt stuck between the needle and seat on your carb, causing it to run rich.

Longhorn Man · 09-21-2003, 02:14 PM

You have it wired fine from the sounds of it.
The yellow wire is only fo the points set up. The Points run off of reduced voltage, and they ran a yellow wire from the R terminal on the starter that would zap a full 12 volts to the coil. This is intended to provide a hotter start and aid in starting.
Since the HEI is already getting a full 12 volts, this is uneeded.

I agree with looking elsewhere.

70short · 09-21-2003, 02:24 PM

Thank you for the quick reply! I really appreciate it. Still looking?

09-21-2003, 01:55 PM	#1
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	HEI hook-up need help I recently replaced my points setup with A summit HEI and wires. The truck ran much better. About A week and A half latter the truck is running very poorly. Will not idle I crank the idle up to about 1100 just to keep it running and it misses real bad and very rich. I removed the plugs and cleaned them. The plugs are gapped at .040. that was recommended to me by the auto parts store. ACDelco small plugs. Engine is out of A 75-76 chevy truck. I have 12v at my swichable ignition power with the ignition on to the coil. I also had to run new wires for the ignition and power to the HEI coil. One of my questions here is "The only power lead I have running from the fuse block(switchable) is to the posative side on the coil. The old points system had another wire running to the starter?" is this correct. The engine has alot of miles on it and several oil leaks I am trying to chase down. Why would it run good for A week then all of the sudden not. Should I replace my ignition switch itself. I am confussed __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

09-21-2003, 01:59 PM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	If the truck is running super rich, i would suspect it to be a carb problem instead of an igniton problem. As long as you have a full 12v going to the HEI it should be fine. Maybe there is a piece of dirt stuck between the needle and seat on your carb, causing it to run rich. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

09-21-2003, 02:24 PM	#4
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	Thank you for the quick reply! I really appreciate it. Still looking? __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

09-21-2003, 02:14 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	You have it wired fine from the sounds of it. The yellow wire is only fo the points set up. The Points run off of reduced voltage, and they ran a yellow wire from the R terminal on the starter that would zap a full 12 volts to the coil. This is intended to provide a hotter start and aid in starting. Since the HEI is already getting a full 12 volts, this is uneeded. I agree with looking elsewhere.



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