glow plugs are delayed??
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Senior User
Joined: Aug 2007
Posts: 161
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From: northern indiana
glow plugs are delayed??
hi all, back to this again, well i changed my oil temp. sensor and that did not help. i need some input on this as it is getting worse and it's like 5* outside and i kind of need these things, they won't come on ti'll you cycle the key 3-4 times and sometimes you have to hit the starter be for they will come on? i checked the relay and it's not getting power? like a sensor is telling the pcm or it's just the pcm not turning them on??
Postmaster
Joined: Sep 2006
Posts: 3,048
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maybe coolant sensor is bad. im sure you can measure the sensors instead of replacing them. im sure somone will chim in on the parameters when GP are turned on. but sounds like one of the sensors is telling your PCM that its worm,,,,,,or you have bad connection somwhere ..... im sure the schematic would help too. we can look it up cause i dont remember if the wire to activate GP is going straight from PCM or not...
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
The GPR gets a ground signal from the PCM in order to energize it.
https://www.ford-trucks.com/forums/7...pr-system.html
https://www.ford-trucks.com/forums/7...pr-system.html
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Not getting power too the GPR or power coming out of the GPR? If you're worried about the sensor, unplug the EOT and turn the key on. That should make the PCM default to a glow plug on time of 2 minutes. Just don't drive around with the sensor unplugged.
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Senior User
Joined: Aug 2007
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From: northern indiana
never mind i'm just stupid, someone told me to try that already! sorry any more ideas??
is the bps in the pcm?
is the bps in the pcm?
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
I'm thinking the GPR is hooked directly to the batteries. There may be a fusible link in there somewhere. You'll just need to trace the hot lead from the GPR back to the battery and see if you can find a problem.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
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From: Wake Forest, NC
I'm pretty sure the wiring is different than on my 02. The wiring shows two fusible links inline with the power feed to the GPR and the AIH Relay. Not sure where they initiate. On my truck the power cable runs from the passenger battery to the GPR, AIHR and around to the alternator.
So if you have verified that the BIG terminals don't get power, then you have a main power feed issue. But you need to clarify some on what you mean by it's not getting power. The relay coil power feed comes from the same fuse that powers the PCM and a few other things. So if they are working, then it probably isn't a fuse or the PCM power relay.
The really good chance, if you haven't replaced it, and I didn't see that you did, is the GPR is bad. I really like the one from NAPA that bolts right in place. A lot of people like the stancor one, but I think the NAPA one is just fine, bigger and beefier and available anywhere there is a NAPA.
So if you have verified that the BIG terminals don't get power, then you have a main power feed issue. But you need to clarify some on what you mean by it's not getting power. The relay coil power feed comes from the same fuse that powers the PCM and a few other things. So if they are working, then it probably isn't a fuse or the PCM power relay.
The really good chance, if you haven't replaced it, and I didn't see that you did, is the GPR is bad. I really like the one from NAPA that bolts right in place. A lot of people like the stancor one, but I think the NAPA one is just fine, bigger and beefier and available anywhere there is a NAPA.