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Old 02-26-2008, 09:16 AM   #1
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Diesel cool weather starting

I wonder if someone can explain this one for me. I have a 97 F250 PSD with the 7.3. It starts fine in COLD weather (20's and lower), but in the 30-40 degree range it can be a bear to get started. Below 30 the glow plugs seem to do the trick with no problems. I would have thought that it should start easier in the cool weather range than in the colder temps. Any ideas?
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Old 02-26-2008, 09:22 AM   #2
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Hey GD, i have not had any issues with cold weather (down to -25F). I did a post a while ago about what I learned about cold weather and diesel. In short; should be a non-issue with todays glo plugs and formulated fuels.

I am thinking you might have a problem with moisture (humidity)?
Any trouble codes?

Wish I could offer more....

Bill
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Old 02-26-2008, 09:42 AM   #3
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Your thermotimer switch (glow plug controller) may have a problem. Try cycling the ignition key twice before trying to start the engine.
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Old 02-26-2008, 10:42 AM   #4
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I just spoke with a friend at work who has a 95 PSD and he thinks it may be a moisture issue getting into the solenoid.
He states that the thermotimer is controlled by the computer.
He replaced the solenoid on his truck for $53 and has no starting issues.
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Old 02-26-2008, 11:07 AM   #5
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So between relacing the glow plug controller and the solenoid which is the place to start? It just really boggles me that it starts fine when its cold out but not when its in the 30s
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Old 02-26-2008, 11:52 AM   #6
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My friends truck did not have a relay but only a solenoid. He said that some trucks had a relay and some did not.
I would take all the connections apart and clean them and put some dielectric grease on the terminals. (could be lots of dirt or corrosion which hold moisture).
If that doesn't work you may want to find a Ford Truck forum to find out how to test the components or you could just throw some new parts at the problem and hope you hit the target.
Sorry I can't be of more help.
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Old 02-26-2008, 11:55 AM   #7
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Could be the coolant temp sensor is bad. When open, it reads -32, and when shorted it reads 250+.
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