GP issue 1987 6.9L
Thread Starter
|
New User
Joined: Jan 2021
Posts: 1
Likes: 0
GP issue 1987 6.9L
I’ve got an 87 F250 with the 6.9L idi and I have tried just about everything I can think of to get the glow plugs to work including replacing all the glow plugs as well as the gp relay under the air filter and changing the pushbutton switch. If I spray starting fluid it starts up just fine and as long as the coolant temperature stays relatively warm I can shut it off and on throughout the day. Help!!
New User
Joined: Jan 2021
Posts: 9
Likes: 0
How's the voltage across the plugs and at the relay? Could be a battery or other electrical issue if not enough power is making its way to the plugs.
When you try to cold start, does the indicator light come on for the GPs, or does it stay dark?
When you try to cold start, does the indicator light come on for the GPs, or does it stay dark?
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
he has indicated he has Manual Glow plug modification ....so it really does not matter if the light works or not depending on how it is wired....
but for sure it could be a wiring error ... and yes he should check voltage at plugs and on the Relay and also determine if the relay is even energizing when he pushes the button.
but for sure it could be a wiring error ... and yes he should check voltage at plugs and on the Relay and also determine if the relay is even energizing when he pushes the button.
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
Have you tried bypassing the push button?
Those things are made so poorly now, lonewolf has also mentioned on this forum before about adding a diode on the output side to reduce solenoid kickback. Pretty great idea to make it last imo
Those things are made so poorly now, lonewolf has also mentioned on this forum before about adding a diode on the output side to reduce solenoid kickback. Pretty great idea to make it last imo
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
Trending Topics
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
well, I give REPs where deserved and I feel you should have more as you do help here a lot and what you give is good info... mine came from just helping folks as you do
I don't care about them either never asked for them and don't know WTF I got them... but I try pass them around.... I know I have helped lots of folks here but it ain't about me....it's about all of us in this group .... I sure don't have all the answers.... it's the collective that has the answers....
my advise is same take it or leave it ... I don't much care
WE can blame it on TJC
I don't care about them either never asked for them and don't know WTF I got them... but I try pass them around.... I know I have helped lots of folks here but it ain't about me....it's about all of us in this group .... I sure don't have all the answers.... it's the collective that has the answers....
my advise is same take it or leave it ... I don't much care
WE can blame it on TJC
i ain't rite
Joined: Mar 2005
Posts: 65,591
Likes: 5,617
From: Marlboro Mental Hospital.
i AM NOT "locked up" i can escape whenever i want to. the guards are all young pups, and have no idea there are all those underground tunnels and hidden doors around this place.
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
New User
Joined: Jun 2018
Posts: 12
Likes: 0
Check and make sure you have power going to the GP relay via the 2 10 guage wires in the harness at the passenger inner fender. They become corroded and sometimes won't make contact or when they do because of the high resistance will get very hot and melt. It's a common issue and was the problem I had with mine, even wired manually the solenoid would click but because of the bad connection the GP's wouldn't burn.
https://www.oilburners.net/threads/g...nnector.73856/
https://www.oilburners.net/threads/g...nnector.73856/
Thread
Thread Starter
Forum
Replies
Last Post
mcphm519
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
Jan 9, 2011 08:54 PM
badasblue
1999 - 2016 Super Duty
4
Feb 11, 2010 11:36 PM
ghunt
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
7
May 25, 2009 12:31 AM
Kliphton
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
4
Apr 24, 2004 04:17 PM