Wont start unless plugged in - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 04-06-2008, 08:30 AM Thread Starter
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Wont start unless plugged in

I know this has probably been brought up before but ny 99 7.3 will not start in cold weather unless it is plugged in. The glow plug system checks OK. I just replaced the batteries and that didnt help. Anybody had this issue in the past and how did you fix it.
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post #2 of 13 Old 04-06-2008, 09:59 AM
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I had a similiar issue, but it was the glow plug relay...

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post #3 of 13 Old 04-10-2008, 01:21 AM
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how cold is the weather....
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post #4 of 13 Old 04-10-2008, 01:39 AM
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you might check your fuel heater........the glow plugs heat the air to a set temp. and one or more might be heating up but not heating enough...........ohm the glow plugs...they should be at least 1.5 to 5.0 ohm's......
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post #5 of 13 Old 04-10-2008, 02:42 AM
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Sounds like glow plug system, double check the relay then might have to check the amp draw on the plugs. That’s much better than my other thought of low compression.

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post #6 of 13 Old 04-10-2008, 02:50 AM
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Most likely the Glow plug relay

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post #7 of 13 Old 04-10-2008, 03:56 AM
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i agree with dave...prolly the relay...doulde check...
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post #8 of 13 Old 04-10-2008, 06:55 AM Thread Starter
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Thanks for the responses. Numerous items were checked by "scanner" including the glow plug system. Everything checked out "OK". I requested my mechanic to physically remove the covers and look at the glow plugs himself. With much hesitation (because the ^&%^ing scanner showed that the plugs were OK) he agreed. Sure enough - they weren't "OK". After market glow plugs were installed prior to me buying the truck and 3 weren't "grounding". Once again - the scanner showed that the glow plug system was "OK". Ford plugs were put in an no further issues. Thank you all for your input.
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post #9 of 13 Old 04-11-2008, 04:45 AM
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Glad you got it going. I’d look into getting a new mechanic that knows what he is doing instead of trusting a scanner. How the heck can a scanner diagnose the glow plug system? All the computer controls is one little ground wire and the is no feedback. That’s why I do all my own work, I don’t trust mechanics.

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post #10 of 13 Old 04-11-2008, 05:47 AM
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My truck has 2 controlers on top buy the feul filter when the switch is turned on one cycles and one doesn't. Which one is the one I'm after
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