Sorry I’m sure this has been covered but I couldn’t find it looking on my tiny phone screen. I recently purchased a 1986 M1008 from government auction. While testing the gp controller I found it was actually triggering the solenoid but it kept kicking on and off. But functioned fine when I grounded the light blue wire. I have it bypassed with a push button switch for now but would like to get it back to original. Can someone tell me what diode or switch on the controller would be the cause for it to kick out so early and then turn on and off? Seeing as no one is making the gp card anymore.
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Glow plug controller malfunction
- Thread starter K.B.
- Start date
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- State College, PA
New cards with improved functions can be purchased at Hill Billy Wizard.
CUCV GP Card
You may also want to read up on how the controller works here:
GP Controller Theory of Operation
CUCV GP Card
You may also want to read up on how the controller works here:
GP Controller Theory of Operation
Thank you very much.
After watching video, so yes I knew about the on off cycle for after the original run of the plugs but it would go into the short cycle sequence right away. I do think my glow plugs might be part of the issue now that I’ve bypassed because even with it being 80f outside today still took 3 tries before it popped off
How long are you holding them on? Cold start with 10 to 15 seconds should be enough at that temp. Could be you do have some glows that are not working. With that relay goin nuts who knows how often they turn on or for how long without you knowing it. Have you checked the fuel filter yet? or the fuel in the tank? See if it's red fuel. Every one of these I've bought from them needed a new tank. Does it smoke when it does start cold? They all do a little first start of the day but not a mosquito destroying amount.
Well seeing as I started this thread and it might be related to gpc. Since I have gone to a push button on the dash because hillbilly at the time was out of stock and I’m a poor man. It is now a very cold Minnesota winter and I don’t seem to have high idle function on my ‘86 m1008. Because I took card out does that mean the high idle solenoid won’t trigger?
I have one that the card is not in with a bypass and the high idle did work.
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The high idle is not a function controlled by the GP card.
It is turned on and off by a temperature controlled switch on the right side of the engine block near the rear of the engine.
It is turned on and off by a temperature controlled switch on the right side of the engine block near the rear of the engine.
Awesome thank you even though I was a diesel tech for 12 years never really worked on a Detroit this old unless it was a 2 stroke and even then it was like 3 times.
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Once you get the bugs, gremlins and past hacks worked out, the CUCV 6.2L is very reliable.