need some GP / GPR help
Posting Guru
Joined: Feb 2010
Posts: 1,411
Likes: 1
From: Opelika, AL
i was refering to tdpower's picture. if it doesnt have the Grey (labeled gpcm) box like td's picture then it came from the factory with two relays that look the same. one is placed directly in front of the other. the one to the rear (cloeset to the cab) is for the glow plugs...the one closer to the front is for the air intake heater and could have been removed by the previous owner (it's not required to run).
i would wait and make sure your truck has cooled down all the way so the relay will stay on longer than a few seconds and that will give you time to turn the key on and run artound to check voltage again. if you dont have the required voltage on the inboard side post then you need to replace the relay.
Edit: or it could be what pony boy said...lol but still make sure it's good and cooled off before checking the voltage.
i would wait and make sure your truck has cooled down all the way so the relay will stay on longer than a few seconds and that will give you time to turn the key on and run artound to check voltage again. if you dont have the required voltage on the inboard side post then you need to replace the relay.
Edit: or it could be what pony boy said...lol but still make sure it's good and cooled off before checking the voltage.
Thread Starter
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Mountain Pass
Joined: Jun 2010
Posts: 205
Likes: 3
thanks guys, i will give all of this another look this evening and will let yall know what i find out this evening when i can have the time to really look into what the heck i have/don't have. i really appreciate all the help.
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Mountain Pass
Joined: Jun 2010
Posts: 205
Likes: 3
My fault, I should have said it was an early 99. I appologize for that for it never crossed my mind, so now that we all know I am not crazy, I have let the truck get cold and retested the GPR, and as earlier only one large post has voltage with key off and nothing else, turn the key on and it clicks once no vibration and one large post has voltage and one small one. i kept checking for a little while with the key still on and nothing changed. kept getting 2 post (1 small 1 large) with voltage. Thats all shes got and there aint no more. So am I correct in thinking she needs a new GPR? thanks again guys yall on FTE are a life saver.
Levi
Levi
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Mountain Pass
Joined: Jun 2010
Posts: 205
Likes: 3
Ok guys so maybe I am crazy! I checked my new volt meter to discover a blown fuse, so after replacing it I do have volts on every post, 11.8-12.6 until the relay clicks, then only volts on two post. So I now believe the glow plugs need to be checked. Am I correct go my thinking or do I just say forget it?
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
Ok guys so maybe I am crazy! I checked my new volt meter to discover a blown fuse, so after replacing it I do have volts on every post, 11.8-12.6 until the relay clicks, then only volts on two post. So I now believe the glow plugs need to be checked. Am I correct go my thinking or do I just say forget it?
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New User
Joined: Jan 2011
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New Guy
I just now joined into the fun. I own a 1997 F-350 powerstrke 1 ton flat bed located in SW Washington. I bought (stole) the truck last June from a customer of my father in law who is a master diesel machanic whois now in AZ. There was alot of front end and cooling system work to do, but now I need to do some ignition modification stuff. The truck was used in heavy construction work in a very dry climate in the Yakama Valley and now here on the other side of the mountains it is very very wet. All was strong during the summer and fall, but now with all the wet and the cold of winter it is very hard to start under 40 degrees. In addition, after a 15 min. warm up (not yet to operating temp) in the driveway, I get on to the highway and the replaced tranny will not shift out of 3rd even at 3000 rpm and the engine will not fire on all eight until to operating temp. The only fuel here is #2 highway. I believe the truck was ran on farm fuel from the beginning. Any suggestions?
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Mountain Pass
Joined: Jun 2010
Posts: 205
Likes: 3
Thanks Chris, I will use tomorrow evening to check into the ohms on the GPs. a question about that is, if i unplug the harness going into the valve cover do i test the harness or the plug on the cover itself?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
I just now joined into the fun. I own a 1997 F-350 powerstrke 1 ton flat bed located in SW Washington. I bought (stole) the truck last June from a customer of my father in law who is a master diesel machanic whois now in AZ. There was alot of front end and cooling system work to do, but now I need to do some ignition modification stuff. The truck was used in heavy construction work in a very dry climate in the Yakama Valley and now here on the other side of the mountains it is very very wet. All was strong during the summer and fall, but now with all the wet and the cold of winter it is very hard to start under 40 degrees. In addition, after a 15 min. warm up (not yet to operating temp) in the driveway, I get on to the highway and the replaced tranny will not shift out of 3rd even at 3000 rpm and the engine will not fire on all eight until to operating temp. The only fuel here is #2 highway. I believe the truck was ran on farm fuel from the beginning. Any suggestions?
Can't help you on the tranny, I would go back to the place that replaced it and see what they say.
Not firing on all 8? Could be injectors, or low compression. Need to diagnose.
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
https://www.ford-trucks.com/forums/7...pr-system.html
...but in a nutshell, unplug the harness from the valve cover, locate the necessary pins and ohm the pins on the valve cover and not the harness that feeds it from the GPR. I had three glowplugs that were out of spec when I went through this. I replaced all eight of them last fall and the truck is much happier on cold mornings.