'89 IDI 7.3 not starting - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-06-2013, 07:56 PM   #1 (permalink)
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'89 IDI 7.3 not starting

Hey Everybody,

Ive got a 1989 F350 7.3 IDI 2WD that up until recently, was starting just fine. I did a one day 900 mile trip from Tucson to Las Vegas to pick up a welder, and it seems like the trouble started after that. So far I have:
- Installed two new 850 CCA batteries
- Cleaned up all of the grounds and replaced battery cable ends
-Put a new solenoid on it
-Checked the glow plugs with a meter, all dead nuts at 3K ohms
-New fuel/water filter

The starter, I am not sure if it is okay; I know it is supposed to be spinning a minimum of 200RPM, but I have no way to check it. Took it to an Autozone today, inconclusive (and a waste of time)
My WTS light stays on when I try to start it for about 10-12 seconds, but one thing I did notice was I hear no clicking from the controller like I am supposed to, and the volts gauge on the dash does not deflect (when it is supposed to click)
Oddly enough, sometimes Ill take my battery charger after I try to start it once or twice, hook up the battery on the passenger firewall(in engine start mode), and it starts! Sometimes that works, but not always.

Any thoughts? I need to get my rig running again
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Old 11-06-2013, 09:21 PM   #2 (permalink)
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Take the batteries off and load test them. I have seen new (off the shelf) batteries fail. You may not get the GP's cycling after the truck has been started once for the day.
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Old 11-07-2013, 08:57 AM   #3 (permalink)
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Yes, I did that already. Guess Ill put a meter on the controller relay today and see what is going on there. Now that I think about it, I have never heard any clicking from the GP controller.
I talked to my step dad yesterday (he used to be a diesel mechanic) and he told me "not to worry" about the glow plugs, as I live in Arizona, and even now the temps are usually about 70-75 degrees when I try to start it...I am not so sure about that, though.
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Old 11-07-2013, 09:12 AM   #4 (permalink)
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Even when the temps are in the 100s, the truck starts much easier with glow than without.
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Old 11-08-2013, 09:52 AM   #5 (permalink)
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yes, that is what I thought. I took one of the plugs out yesterday and cycled them and no heat at that plug. So I took a look at the controller and one of the big lugs on it was loose, like it was broken off inside so I didn't even bother to test it, I ordered a new one...keep my fingers crossed and hope that's it
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Old 11-09-2013, 05:55 AM   #6 (permalink)
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Did you ground the plug body?
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