Glow Plug Relay Help - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 03-27-2010, 08:17 PM Thread Starter
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Glow Plug Relay Help

Hey yall i got 2002 f250 and it will not start if its like 60 or below. Kinda rediculous. Tested my Glow plug relay today and it stayed on at 10.8 volts for 30 seconds? Is this right or should it stay on longer? thanks
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post #2 of 13 Old 03-27-2010, 08:19 PM
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Winter Operation, Hard Starting, Hissing Sound Etc...
Troubleshooting GPR & GP's
What was the temp when you tested it?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 13 Old 03-27-2010, 08:22 PM Thread Starter
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Its about 65 right now. then has been sitting for about 2 and a half hours
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post #4 of 13 Old 03-27-2010, 08:28 PM
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That should be ok then.
Did ya test your GPs?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #5 of 13 Old 03-28-2010, 06:35 PM Thread Starter
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No i havent tested my plugs. whats the easiest way to test them? I did not plug the truck in last night and went out to start it today around lunch, it was about 60 out. Truck would turn over and over but never start. So i tried something, I turned the key on till the "wait to start" went of then i turned it off. Did this about 15 times. Truck actually started but was running VERY VERY rough and had almost no power. Would hardley move. RPM's got to only like 1000. I drove it down the road about a mile and it finally got all the power. Whats the deal? Glow Plugs cause all this? Sorry so long. Thanks
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post #6 of 13 Old 03-28-2010, 07:05 PM
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Since you cycled the glow plugs multiple times, you probably got the ones that actually are working pretty hot. Read through this tutorial - it tells you how to check the glow plugs at the valve cover harness:

Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
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post #7 of 13 Old 03-28-2010, 07:15 PM Thread Starter
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Thanks. Ill get to reading.
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post #8 of 13 Old 03-28-2010, 07:22 PM Thread Starter
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very helpful. Ill be checking this weekend when im not workin.
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post #9 of 13 Old 03-29-2010, 04:50 AM
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Troubleshooting GPR & GP's
Says in there how to test em.
Just because the WTS light is off, doesn't mean the GPs turned off. That's just a light the computer controls. It uses different sensors (temp, baro, oil/coolant temp) to determine how long to leave the GPs running and how long to leave the WTS light on which just lets the GPs heat up enough so it'll start. IF all your GPs are working. Just leave the key on for about a minute or even up to 90 seconds instead of cycling it right after the light goes out. A lot easier on all those relays in there, especially the GPR.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #10 of 13 Old 03-29-2010, 06:19 AM
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Newbie to the diesel world

I have a 05 F250 FX4 with 60k and my wts light will only stay on for about 10 seconds first thing in the morning and then go off. If i try to start it right after it goes out it turns over but it takes a while for it to start. Then later in the day the wts only flicks on for a second and goes off and once agian it takes a while to start. Any advice for a newbie?
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