99 7.3 - Ford Powerstroke Diesel Forum
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Old 03-06-2014, 02:02 PM
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99 7.3

i have changed my glow plugs and glow plug relay but my truck is really hard to start cold. any ideas on what i should try next?
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Old 03-06-2014, 02:08 PM
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plug it in and see if it helps
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Old 03-06-2014, 03:57 PM
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I plug it in at night but during the day if it gets below even 40 or 50 degrees it takes forever to get it started. It acts as if the engine is extremely cold even when the temperature outside isn't that cold.
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Old 03-06-2014, 04:05 PM
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keep it plugged in untill you drive it , not just over night
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Old 03-06-2014, 04:50 PM
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You have problem restarting at the end of a 50 degree day?

You have other problems....

Go ahead and make sure the entire GP system is working properly -> Troubleshooting GPR & GP's

But, at those temps you shouldn't even need them to work. Also, there's little difference after 3hrs of being plugged-in. You can easily put a timer on it and have it come on 3hrs before you need to start in the mornings.

How many miles do you have on the engine/injectors?
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Old 03-06-2014, 08:37 PM
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might also want to check the starter and batteries and such , i have my gpr un hooked and even in the 40's it fires right up
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Old 03-07-2014, 03:48 AM
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I've 300,000 on the fuel injectors.
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Old 03-07-2014, 07:15 AM
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Quote:
Originally Posted by Bigdiesel7.3 View Post
I've 300,000 on the fuel injectors.
I think that's most likely your problem...

http://www.swampsdiesel.com/files/7....Diagnostic.pdf
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