89 Navistar 7.3L idi No Start - Diesel Forum - TheDieselStop.com
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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post #1 of 5 (permalink) Old 01-11-2019, 03:03 PM Thread Starter
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89 Navistar 7.3L idi No Start

U-Haul Truck

Brand new Interstate batteries whirl the engine.

Truck has sat for 4 years. When last ran, started in less than one revolution and ran fine. I've owned for 10 years.

After 2 seconds on the WTS light found one glowplug with open circuit. Replaced all. 12 seconds + now.

Dinky Faucet suspected of not doing it's job and replaced with Faucet Duralift.

New fuel filter.

Pressure gauge inline to IP holds 4+ PSI steady. (all air bled)

Clear fuel return line on drivers side running as it always did.

With pump running and ignition switch to run, no fuel coming out of IP bypass clear tubing.

Two wires connected to the top of IP were checked for current with key in run position.

Both showed 9 volt +/-. (questionable test connections could be dropping voltage)

One wire is red and runs to the IP connection closest to the dash. The other is yellow and also runs to a solenoid that sits against a throttle plate that is hinged to the IP.

I read in another thread that if "no fuel from IP bypass, then no start".

So what's next? New shut off switch?

Is shut off switch the red or the yellow connection.......and what is the other?

Thanks for any input or suggestions.

Harold


89 Navistar 7.3L idi No Start-imga0398.jpg

1989 U Haul truck with Navistar 7.3 IDI
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post #2 of 5 (permalink) Old 01-11-2019, 06:43 PM Thread Starter
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I pulled the connectors and ran a hot wire to each spade. There was an internal clicking sound on both. If they are both valves, they are clicking but have no idea if they are actually opening.

Should there be fuel coming out of the bypass hose from the IP with the electric pump running and the ignition on? (separate switch for the FP)

Also I've read 4 PSI for the IP and other places say 6 PSI. Some have said that if it goes above 4 PSI the timing will be advanced. But should it at least run on 4 PSI?

I'm 50 miles from the nearest mechanic. Need this truck to run for a day very badly.

1989 U Haul truck with Navistar 7.3 IDI
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post #3 of 5 (permalink) Old 01-11-2019, 06:57 PM
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here is wire diagram that shows the colors

Last edited by Randy 4614; 04-03-2019 at 08:45 PM.
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post #4 of 5 (permalink) Old 01-15-2019, 01:49 PM
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Had same problem. Neighbor spray a little wd40 into intake and then a little wisk of starting fluid (really little). It wanted to start so that told us it was not getting fuel. Ck'd around and found I had a fuel leak and sucking air.
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post #5 of 5 (permalink) Old 01-16-2019, 05:04 AM Thread Starter
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Thanks. Had that problem once. Now have a clear filter return line and it shows no air bubbles. None at Schrader valve either.

1989 U Haul truck with Navistar 7.3 IDI
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