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#1 |
Registered User
Join Date: May 2014
Location: Rose Hill NC
Posts: 193
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Truck keeps cutting off!
My 72 chevy truck with 350 engine will start and run perfect for about a mile and then cut off just like you switched it off with the key. it wont start back up right then. Go back to it several hours later and it will start right up and go another mile or so. What is wrong? Acts like something is getting hot and has to cool down before it will start again.
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#2 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,373
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Re: Truck keeps cutting off!
That's usually a loose connection. Wiggle all the connectors in the ignition circuit when it's running (in your driveway) until you fine the culprit. That includes the harness that runs to the fuse block.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#3 |
Registered User
Join Date: Jul 2013
Location: Mount Albert.Ontario
Posts: 119
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Re: Truck keeps cutting off!
Need a little more info. What does it do when it shuts off? Crank but no start or no power at all? If no power check all battery connections and grounds. If it cranks look it carb when moving throttle is there fuel ?
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#4 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,461
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Re: Truck keeps cutting off!
HEI ? If so check the coil
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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#5 |
Senior Member
![]() Join Date: Apr 2016
Location: Fairbanks, AK
Posts: 334
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Re: Truck keeps cutting off!
Mine with hei did that exact same thing. Turned out to be a bad module. Switched to the “old” one that was in the glove box. That was 2 years ago. No problems since.
__________________
1972 GMC K2500 Super Custom Matt |
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#6 |
Senior Member
![]() Join Date: Jun 2011
Location: burlington,iowa
Posts: 439
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Re: Truck keeps cutting off!
if you are running Pertronix and the wrong coil or a resistor wire, it will do the same thing.
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Tom in Iowa 68 L88 C10 68 4x4 C10 soon |
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#7 |
Senior Member
![]() Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,330
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Re: Truck keeps cutting off!
This gets my vote, and it’s the easiest thing to try first.
__________________
DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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#8 |
Registered User
Join Date: May 2014
Location: Rose Hill NC
Posts: 193
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Re: Truck keeps cutting off!
Yes I am running the pertronics ignition. when it does this, the engine will turn over fine but wont start. When you let go of the key it acts like it wants to start but wont.
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#9 | |
Registered User
![]() Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,208
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Re: Truck keeps cutting off!
Quote:
It may or may not be bad though. It may just be out of adjustment. https://itstillruns.com/do-test-pert...n-7993715.html I'd try it before I spent any money on it. Hope this helps.
__________________
Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#10 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 755
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Re: Truck keeps cutting off!
Your Pertronix module requires a full 12v. If your stock dizzy was a points dizzy then you need to remove, bypass the stock resistance wire and install a copper braided 12 gauge wire.
Pertronix has instructions in their kits how to do this. If the resistance wire has been bypassed then either the Pertronix module and or coil is bad. Problem usually shows up once motor gets to operating temp. Use heat sink paste under module when replacing. Most auto part stores have it for $2. Not dialectic grease, heat sink paste is what yu want |
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#11 |
Registered User
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,031
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Re: Truck keeps cutting off!
Next time it won’t start throw a timing light on it to verify you don’t have spark. No spark is likely the issue but as simple a test as you can do.
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