gp light
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Mountain Pass
Joined: Mar 2005
Posts: 128
Likes: 0
From: arlington tx
gp light
My friend just got a 1986 f350. when the truck is cold the gp light comes on. After the truck is warm it doesn't. Is that normal, because my 1997 comes on everytime I start it. Thanks for your help
Tuned
Joined: Oct 2004
Posts: 250
Likes: 6
From: new york
On my 84 it does the same thing, on mine its the controller that screws into the head which is differen't than the 7.3. When they start to go bad that is what they do, mine also only stays on for about 10 seconds when it is extremely cold. But as long as it starts I wouldn't mess with it
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The 83 thru 86 6.9 has a coolant temp sensor in the rear of the passenger side head.
For the glow plugs to not come on when the coolant is warm is proper operation.
When they go bad either they do not come on at all or they come on all the time.
When mine went bad it would come on for no reason while driving down the road.
Fried glow plugs were the result.
I have been much happier since I went to manual glow plugs.
For the glow plugs to not come on when the coolant is warm is proper operation.
When they go bad either they do not come on at all or they come on all the time.
When mine went bad it would come on for no reason while driving down the road.
Fried glow plugs were the result.
I have been much happier since I went to manual glow plugs.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Is your controller working now?
The new style solid state system used in the 87 thru 94 engines is a good system.
If anyone other than you drives the truck I would leave the controller alone if it works.
If it does not work then you need to buy a rather expensive controller/relay 150+ at Ford or 100+ at International.
If you alone drive the truck you can remove the white wire from the relay.
Attach a wire to the terminal it came off of and run it inside the truck through the firewall.
Get a push button momentary switch and attach the wire to it.
On the other terminal of the switch attach another wire that needs to go to a good ground under the dash.
Installation is now done.
Operation
Turn the key to ON.
Push the button for 10 seconds.
Start the engine.
If it is very cold, 10 degrees or below, I usually do the 10 second heat cycle then wait 15 seconds and repeat the 10 second cycle before trying to start the engine.
The new style solid state system used in the 87 thru 94 engines is a good system.
If anyone other than you drives the truck I would leave the controller alone if it works.
If it does not work then you need to buy a rather expensive controller/relay 150+ at Ford or 100+ at International.
If you alone drive the truck you can remove the white wire from the relay.
Attach a wire to the terminal it came off of and run it inside the truck through the firewall.
Get a push button momentary switch and attach the wire to it.
On the other terminal of the switch attach another wire that needs to go to a good ground under the dash.
Installation is now done.
Operation
Turn the key to ON.
Push the button for 10 seconds.
Start the engine.
If it is very cold, 10 degrees or below, I usually do the 10 second heat cycle then wait 15 seconds and repeat the 10 second cycle before trying to start the engine.
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