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post #1 of 5 Old 01-09-2014, 10:36 AM Thread Starter
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Cold no start

Hi guys 97 f250 in michigan.. when its 75 out ya let the plugs warm up and crank it takes about 3-5 seconds of cranking and fires right up. It does this untill its about 20 degress out and will crank all day and no start.. even when plugged in. I checked the gp relay and it works. So that makes me think a couple glowplugs are out? What do you guys think? The block heater may also be out? Just wanna know what you guys think. thanks

1997 F-250, SD Axle Swap Front and Rear, 4.10 LS, 20x10 -24mm, 35x12.50 Thuderers, E4OD W/ Shift Kit, Upgraded Torque Converter, Upgraded Trans Cooler, Ladder Bars By Me, TS-6, Baby Swamps, 3" DP to 4", 6637, PHP Tuning, Gauges, and A Lot of Lightbars!
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post #2 of 5 Old 01-09-2014, 11:01 AM
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Glow plugs - check the resistance at each GP terminal on the valve cover gaskets (black probe to ground). Should be right around 1 ohm each.

Block heater - measure the resistance at the two blades of the AC plug. Should be about 14-15 ohms. If it's higher, measure again where the heater cord plugs into the heater itself. If that's in the right range, then the cord is faulty. Generic replacement available at NAPA.

GP relay test - even if it's "working", it may not be providing sufficient voltage. Turn the key to RUN, and check the voltage at each of the two big terminals. The "always hot" one may be slightly higher than the other one, which goes to the glow plugs, but if the _difference_ is more than 0.3V, the relay is failing.
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post #3 of 5 Old 01-09-2014, 11:19 AM Thread Starter
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Ok sweet thankyou i will check saturday its supposed to be around 40..

1997 F-250, SD Axle Swap Front and Rear, 4.10 LS, 20x10 -24mm, 35x12.50 Thuderers, E4OD W/ Shift Kit, Upgraded Torque Converter, Upgraded Trans Cooler, Ladder Bars By Me, TS-6, Baby Swamps, 3" DP to 4", 6637, PHP Tuning, Gauges, and A Lot of Lightbars!
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post #4 of 5 Old 01-09-2014, 11:50 AM
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saturday its supposed to be around 40..
Same here; HEATWAVE!!!!
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post #5 of 5 Old 01-09-2014, 12:50 PM
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Block heater problem, you may just have to replace the plug connector. I just picked on up ay Home Depo.
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