73/77 troubleshooting ?
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New User
Joined: Nov 2019
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From: Washington State
73/77 troubleshooting ?
engine: 400 (1977)
trans: C6
I'm getting ready to do rotors and wheel bearings finally, before I get into that I changed my ignition control module, cranked it a few times with no start. quite odd. any ideas ? when I'm done with brakes I'll try again and swap old one back in if I need to but it's in the shop now so I thought I'd ask. thanks for the replies in advance. love this truck, been a pain in my a** today hahaha.
edit: new spark plugs, new fuel pump, new wires, ran fine earlier when I brought into my shop
trans: C6
I'm getting ready to do rotors and wheel bearings finally, before I get into that I changed my ignition control module, cranked it a few times with no start. quite odd. any ideas ? when I'm done with brakes I'll try again and swap old one back in if I need to but it's in the shop now so I thought I'd ask. thanks for the replies in advance. love this truck, been a pain in my a** today hahaha.
edit: new spark plugs, new fuel pump, new wires, ran fine earlier when I brought into my shop
Cargo Master
Joined: Jun 2015
Posts: 2,240
Likes: 23
Bad ignition control module. Just because it's new doesn't mean it's working properly. Did the old one work at all? If so toss it back in; if not either buy another one and test, or use a DMM to check what your volts/amps
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New User
Joined: Nov 2019
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From: Washington State
old one works fine, just died on me once when it was mildly warm. thanks !
Regular User
Joined: Sep 2014
Posts: 1,798
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From: Bathurst, New Brunswick
Not all ignition modules are the same. They vary by year. Does the colour of the grommet where the wires come out of the new ICM match the old one?
1974 = Black
1975 = Green
1976/79 = Blue
1974 = Black
1975 = Green
1976/79 = Blue
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New User
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From: Washington State
thank you will check later today
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