What is a GPR? I am just a home "do it yourselfer"
So are most of us, we just like to use abbreviations. The GPR is your Glow Plug Relay. It has one post hooked to constant power, and when the key is first turned on, depending on temperature, pressure, etc., it will send power through the other side of the relay from 0 - 120 seconds. This power is what energizes your glow plugs to aid in starting a cold engine. You can check to see if you have power coming through the GPR with a test light or multi-meter, but since it's not winter, you'll need someone else to turn the key on for you since the glow plugs likely won't stay lit for very long.
Your GPR looks like this.
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Chris
2002 F350 6-speed 444 CID. XLT, Heated Seat, 270,000 & counting. 6637 w/ Pete's armor. Cold air set up for 6637
“Good judgment comes from experience, and a lot of that comes from bad judgment.” Will Rogers
Would the GPR really be an issue at these temps? Sorry, I should ask, where are you located first. But it should effecrt anyone unless it is under 50, right?
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Pat
PAA 67
1999 F-250 LB,CC,4x4
Quote:
Originally Posted by NewEnglandHerdsman
If you listen long enough, even an idiot will say something that makes sense...
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The GPR does not operate very long when the temps are above 50.
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Paul West Virginia Chapter
2001 F-250 7.3 Powerstroke Super Duty XLT Extended Cab 4X4 6 Speed 3:73
Goodyear Wrangler 305/70R16 ATS Tires
Banks Intercooler, tubes and 1999 Turbo Wheel
Steel HPX and CCV Mod
Bully Dog 4" Exhaust and AIS II Air Filter FTE TEAM MEMBER of 53449
Member "Boy you ain't right club#7"
The glow plug light does come on. Would this matter when the temperatures are 70-80 degrees outside. Could this possibly be a injector problem?
The glow plug light is not actually tied to the glop plugs, so that doesn't mean anything about the GPR, BUT it does tell us your fuel bowl heater isn't shorted out.
I guess you're still having the no start issue? Have you kept charging your batteries? Repeated cranking attempts will drain the batteries, so we need to keep them topped off while we play with this.
First, why don't you go ahead and grab a torx screwdriver (an alan wrench will do in a pinch) and remove this plug
This is your HPOP (high pressure oil pump) reservoir. There should be motor oil within 3/4" - 1" of the top. If it's not, top it off with whatever type of oil you use in your truck and try to start.
If the oil level looks good, unplug your ICP (injection control pressure) sensor and see if you have oil in the plug. It's located on the front inboard side of the drivers head here
After inspecting for oil in the plug, leave the sensor unplugged and try to start it again. You don't want to drive around with it unplugged, but if this is your problem the PCM will assume default levels for the ICP and allow the truck to start.
Make sure those batteries are good so we don't miss the problem from batteries drained after too many starting attempts.
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Chris
2002 F350 6-speed 444 CID. XLT, Heated Seat, 270,000 & counting. 6637 w/ Pete's armor. Cold air set up for 6637
“Good judgment comes from experience, and a lot of that comes from bad judgment.” Will Rogers
Hey F350, just wondering that if during my next oil change, is it possible to drain that box and put fresh oil in it. Danged thing looks like it will hold about two quarts.
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Paul West Virginia Chapter
2001 F-250 7.3 Powerstroke Super Duty XLT Extended Cab 4X4 6 Speed 3:73
Goodyear Wrangler 305/70R16 ATS Tires
Banks Intercooler, tubes and 1999 Turbo Wheel
Steel HPX and CCV Mod
Bully Dog 4" Exhaust and AIS II Air Filter FTE TEAM MEMBER of 53449
Member "Boy you ain't right club#7"
Hey F350, just wondering that if during my next oil change, is it possible to drain that box and put fresh oil in it. Danged thing looks like it will hold about two quarts.
I wouldn't recommend playing with the plug on the bottom to drain it. I'd be scared of a leak if you put it back together. I've read where others here have used a tube and a little pump to suck the oil out of there, so it's possible.
The reservoir is just a pass thru tank, so the oil is continuously cycled through the engine. If you were switching from Dino to Synthetic oil I might see sucking the oil out of there to get more of a swap out, but I've never worried about it on mine.
P.S. rtilton, make sure you put that plug back in the HPOP before you try and start the motor. They don't call it high pressure for nothing.
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Chris
2002 F350 6-speed 444 CID. XLT, Heated Seat, 270,000 & counting. 6637 w/ Pete's armor. Cold air set up for 6637
“Good judgment comes from experience, and a lot of that comes from bad judgment.” Will Rogers
Thanks everyone for your suggestions. I had to go to work today so the truck sits parked on the charger. When I get home tonight I will try all of your suggestions. Stay tuned!
Hey everyone thanks for your help on this one. Turns out it was a battery problem. I tried a battery from another truck and the engine fired right up. Thanks again for all your help.
Glad you got it figured out and it was a simple fix. That's why we always ask about batteries first. Sometimes it's hard to believe it can be so simple. I just replaced my batteries this weekend too.
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Chris
2002 F350 6-speed 444 CID. XLT, Heated Seat, 270,000 & counting. 6637 w/ Pete's armor. Cold air set up for 6637
“Good judgment comes from experience, and a lot of that comes from bad judgment.” Will Rogers
Hey F350, just wondering that if during my next oil change, is it possible to drain that box and put fresh oil in it. Danged thing looks like it will hold about two quarts.
Paul, I drain my hpop reservoir each oil change...I have one of those suction guns that look like an old fashion grease gun. You just stick the hose in, pull back the handle and out it comes. Then I put a funnel in the hole and fill it up with clean oil.
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Neal - "I knew I wasn't as stupid as I looked. No one was."
RONNIE 
