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Old 04-27-2014, 06:45 AM
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Won't start

I have a 94 F350 won't start unless I plug the block heater in then it starts and runs fine. I have replaced glow plugs valve cover gaskets and the glow plug relay.when you turn the key on the wait to start light comes on but only for about 7 or 8 sec is there a sensor to control time they stay lit
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Old 04-27-2014, 08:16 AM
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The time that the WTS light is on has nothing to do with how long the glowplugs are energized. The plugs will stay energized for 1.5-2 minutes, so maybe wait a little longer for the plugs to continue heating and then try starting. Also, how many miles are on the truck? Worn injectors (poppets in the injectors) will make it harder to start too. My 94 with 250k on it was getting harder and harder to start in cold temps (and the GP circuits were all good). Cheers!
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Old 04-27-2014, 08:24 AM
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150,000 miles I'll check today to see if that works or how long at the relay
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Old 04-27-2014, 11:27 AM
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Verify that the glow plug relay actually works. The stock units are garbage.

Grab your handy voltmeter, and ensure that one of the big lugs is +12v - it should be always live. The other big terminal should be ~0v. Turn the key on when the engine is cold and go remeasure. You should see ~12v on both of the big lugs, and a fairly small voltage drop between them. If you see no change from key off, the relay is probably bad (or isn't being energized).
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