here's a glow plug doooozy . . . . . .
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
Next cold start, first open the hood take a screw driver and cross out the 2 big terminals on the GPR for at least 30 seconds. Jump in the truck and start it up. If it fires right up and runs smooth, your GPR or wiring are bad and the GP's are likely OK. If it starts up good but stumbles for 5-10 seconds then clears up you may have a couple GP's that are weak or bad, or the wiring going to them.
BTW: You can short out the GPR for 2 minutes without causing any damage when it's below zero F. But if it's 50-60F degrees 30 seconds will be good enough.
BTW: The wait to start light may go off but the GPR is still energized. Watch the volt meter. When it swings towards charge + the GPR has de-energized. Now it's time to start it.
BTW: You can short out the GPR for 2 minutes without causing any damage when it's below zero F. But if it's 50-60F degrees 30 seconds will be good enough.
BTW: The wait to start light may go off but the GPR is still energized. Watch the volt meter. When it swings towards charge + the GPR has de-energized. Now it's time to start it.
Thread Starter
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New User
Joined: Sep 2006
Posts: 21
Likes: 0
I've checked the GPR by crossing already. I guess I'm going to pull the valve covers off and run through the injectors and gp harnesses. Does the fact that it runs smooth right as it gets to the N on the temperature gauge and if I plug it in narrow it to glow plugs? If it's below 50 degrees outside it won't start, wouldn't it be the same if it were an injector issue, regardless of outside temperature?
Senior User
Joined: Oct 2006
Posts: 254
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From: Youngstown,ohio
I could be having this problem too
Not wanting too start but will start after cranking awhile.
Checked the GPR with a meter and got 12+V on one big terminal before turning the key.
Dropped to 0V after turning the key.
I can feel and hear it working.
Tried the jumping and it didnt seem to make a difference only held it about 30 sec or so.
It 70-80 degrees out here.
GPR relay bad?
Not wanting too start but will start after cranking awhile.
Checked the GPR with a meter and got 12+V on one big terminal before turning the key.
Dropped to 0V after turning the key.
I can feel and hear it working.
Tried the jumping and it didnt seem to make a difference only held it about 30 sec or so.
It 70-80 degrees out here.
GPR relay bad?
Thread Starter
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New User
Joined: Sep 2006
Posts: 21
Likes: 0
Ok finally got back to it. Took the valve covers off, tested at the glow plug. ohms are .002 on all. I've got 12v to all the glow plugs except for one. Is that enough to make it not start? I need to find a new injector harness for one of the plugs then I will test. BH
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
.002 isn't a very normal reading. Are you sure you have the meter on the right scale? usually a 10-100 ohm scale. Where are you testing for your ohm readings? Negative battery terminal to ?? (GP, valve cover connector?) Also where are you testing voltage? at the GP connector? even if one wasn't getting juice it should still start.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Originally Posted by MADVAN
On another note.
I would check the EOT before startup to see how it compares to amb temp and IAT.
Bill
I would check the EOT before startup to see how it compares to amb temp and IAT.
Bill
Wondered about that too...
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Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
It has a default for cold.
Its super rich fueling, megga smoker, ect
Default would CEL.
The EOT is the baseline for all. (gpr/fuel/timing ect).
Compression test?
Chip?
Bill
Its super rich fueling, megga smoker, ect
Default would CEL.
The EOT is the baseline for all. (gpr/fuel/timing ect).
Compression test?
Chip?
Bill
Last edited by MADVAN; Jan 29, 2008 at 08:05 PM.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Originally Posted by MADVAN
It has a default for cold.
Its super rich fueling, megga smoker, ect
Default would CEL.
The EOT is the baseline for all. (gpr/fuel/timing ect).
Bill
Its super rich fueling, megga smoker, ect
Default would CEL.
The EOT is the baseline for all. (gpr/fuel/timing ect).
Bill
crop duster ,,bug fogger ....
Last edited by Action4478; Jan 29, 2008 at 07:57 PM.
Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
Originally Posted by Action4478
Crap ..I forgot ,,,(tried it once )...
If you did not know it was in default what would you have thought happened.
Rick has first hand experience on this
Explain it. 911!!!
Iam not saying he is in default. Just possible out of range. The EOT can cause havoc on the gp system.
Bill
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Originally Posted by MADVAN
Rick
If you did not know it was in default what would you have thought happened.
Rick has first hand experience on this
Explain it. 911!!!
Iam not saying he is in default. Just possible out of range. The EOT can cause havoc on the gp system.
Bill
If you did not know it was in default what would you have thought happened.
Rick has first hand experience on this
Explain it. 911!!!
Iam not saying he is in default. Just possible out of range. The EOT can cause havoc on the gp system.
Bill
Testing failed that day... Obviously ,mine is working ...
Now that I said it ,,,,,,,,,,
Last edited by Action4478; Jan 29, 2008 at 08:13 PM.
Postmaster
Joined: Jun 2007
Posts: 2,795
Likes: 1
From: Rogue River, OR
Originally Posted by MADVAN
On another note.
I would check the EOT before startup to see how it compares to amb temp and IAT.
Bill
I would check the EOT before startup to see how it compares to amb temp and IAT.
Bill
2) How do you check the EOT B-4 start up?
Rog
