Cranks but won't start - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 12-09-2006, 04:29 PM Thread Starter
 
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Cranks but won't start

HELP! - I have a 2001 F250 7.3-turbo SD w/ 68k miles. It has been running great. The truck was parked for a week in initially 60f weather, though when i returned the temperature was 17f and the block heater was NOT plugged in as i usually do when the temp is ~40f or colder.
When i tried to start the truck, it cranked and white (diesel-rich-smelling) smoke came out of the tailpipe, but the engine would not start. :shrug: (truck has 2 new batteries)
Any suggestions as to what i can do to start the truck?
The temperature today is suppoded to reach 52f at midday...

Thanks for any help!
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post #2 of 9 (permalink) Old 12-09-2006, 04:42 PM
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I would suspect that the GPR (Glow Plug Relay) is not working correctly. When the GPR gets worn out, not enough voltage can make it to the glow plugs, and consequently, they do not get hot enough for the engine to start.

You can verify this by measuring the voltage ACCROSS the two LARGER GPR terminals with the "Wait to Start Lamp" on. Your reading MUST be lower than 0.5Vdc (1/2 volt), if it is more than that, the GPR is BAD.

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post #3 of 9 (permalink) Old 12-09-2006, 04:50 PM Thread Starter
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Thanks John-
I will measure the voltage across the terminals and see if the GPR may be the culprit.
As a follow-up, with the temperature going to 52f, do you feel i have a better shot at getting it started then when i tried to start it yesterday when it was 17f?
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post #4 of 9 (permalink) Old 12-09-2006, 05:02 PM
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Yes, especially if you use the block heater.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #5 of 9 (permalink) Old 12-09-2006, 05:22 PM
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it is definatly something with the glow plugs because i started mine last weekend when it was 10 below without the glow plugs

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #6 of 9 (permalink) Old 12-11-2006, 10:10 PM
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EDIT: lol I mean with out the block heater plugged in:shootself:

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post #7 of 9 (permalink) Old 12-13-2006, 11:28 PM
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Had this same problem with mine. The dealer said that using 15w 40 oil was the cause and to switch to a lighter oil at least for the winter months. The engine needs a certain amount of oil pressure to start is the way they explained it. I thought they were wrong but it has started every time with the lighter oil.
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post #8 of 9 (permalink) Old 12-14-2006, 12:06 AM
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I Use 15-40 Oil Year round and don't have any problems. But i would try 10-30 and see if that helps

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post #9 of 9 (permalink) Old 12-20-2006, 02:08 AM
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if you let the glow plugs cycle a few times it may get the truck to start so you can get it to where you can work on it.

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