7.3 idi wont start - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 03-29-2010, 04:05 PM
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7.3 idi wont start

Ok im new to this site and the 7.3 idi also, i just bought a 1990 f250 not running. First thing i did was buy 2 brand new 1000 cca workaholic batteries got the truck to crank little bit of white smoke out the intake but no fire. Bought 8 new motorcraft beru glow plugs crankd sprayed bit of ether jumpd but no fire. i believe it is my gpc because my wait to start light does not come on and ignition is rigged through toggle switch when i turn switch on all dash light work volage light works but the wait to start light does nothing. Could this be my problem or somethign else i have full to the injectors also. any help would appreciated i have been trying to get this truck going for almost 2 months now...HELP
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Old 03-29-2010, 04:13 PM
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The easiest way to check the glow plug relay is to remove the glow plug harness from the glow plug and stick a voltmeter on the plug while someone turns the key on. If it gets voltage then the relay is working.
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Old 03-29-2010, 04:29 PM
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it gets voltage but only for a split second
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Old 03-30-2010, 05:58 AM
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Sounds like the relay is bad. There's a chart for comparing the temp vs. "on" time. If it's relatively cool then it should be energized for a few seconds.
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