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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 01-22-2007, 11:13 AM   #1 (permalink)
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Doesent start, glow plugs are good.

My van will not start with out starting fluid. I tested the glow plugs today and all are good. The wait to start light comes on for 8 seconds. I used to hear a clicking sound while the wait to start light was on but not since it quit sarting. This seems like an easy question, but I have no idea, I've had this diesel (my first) for 3 years now and I've replaced the IP pump, lift pump, and glow plugs.
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1989 E350 XL Extended body. 7.3 liter IDI, C6, 4.10, 175,000. I removed the seats and I use it for a cargo van. I purchased this van from a company in LA, CA and it had 117,000 miles. Since then I've replaced the Injection Pump, Injectors, 2 starters, lift pump, water pump.
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Old 01-22-2007, 12:41 PM   #2 (permalink)
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Re: Doesent start, glow plugs are good.

Does it start with a 3 hour plug in? It could be as simple as a bad battery or two, will it start after a good long charge or with a hefty jump?.
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Old 01-22-2007, 12:59 PM   #3 (permalink)
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Re: Doesent start, glow plugs are good.

If the motor is warm or had been running, it will start, but not like it used too, before it would start on its first crank. I'm tempted to replaceing the golw plug power relay but I thought I'd see what thedieselstop had to say.
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1989 E350 XL Extended body. 7.3 liter IDI, C6, 4.10, 175,000. I removed the seats and I use it for a cargo van. I purchased this van from a company in LA, CA and it had 117,000 miles. Since then I've replaced the Injection Pump, Injectors, 2 starters, lift pump, water pump.
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Old 01-22-2007, 01:33 PM   #4 (permalink)
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Re: Doesent start, glow plugs are good.

Could be the relay is bad.

Get yourself an alligator clip wire, with the ignition on, jump between the small terminal on the pass side of the GP relay (with white wire) to and good ground. You should hear the relay click. (Don't keep the jumper connected for more than 8 seconds or you will burn out the glow plugs).

If no click, make sure you have @12 volts as the other small terminal (drivers's side of relay).

If you have power there, but the relay does not click, the relay is likely bad.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

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Old 01-22-2007, 03:31 PM   #5 (permalink)
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Re: Doesent start, glow plugs are good.

Do a load test on those batteries, first!
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02 E350 15 Passenger Cream Puff, 72,000 Miles, 5.4L Gasser

'90 E350 7.3L Ex-Ambulance High Top 420K Miles, No Turbo, Stock Stock stock, No ELC! (Extended Life Coolant) & 10 Oz. Bars Stop Leak. 10 wonderful cool years using Freeze12 without any AC system modifications. Retired 11/8/2011 with blown trans.


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Old 01-22-2007, 04:48 PM   #6 (permalink)
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Re: Doesent start, glow plugs are good.

I went ahead and replaced the relay, but that did not fix the problem, infact 30 minutes of running, my batteries were almost completley dead. Now it sounds like I have a short. I havent the slightest idea where to start.
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1989 E350 XL Extended body. 7.3 liter IDI, C6, 4.10, 175,000. I removed the seats and I use it for a cargo van. I purchased this van from a company in LA, CA and it had 117,000 miles. Since then I've replaced the Injection Pump, Injectors, 2 starters, lift pump, water pump.
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Old 01-22-2007, 05:14 PM   #7 (permalink)
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Re: Doesent start, glow plugs are good.

You would have to have one big short circuit to kill the batteries while the truck was running.

Charge your batteries up, then start the truck. You should see 13.5 - 14 volts at the batteries. If they are around 12 volts the alternator isn't charging.

Did you diagnose the GP relay or just replace it? Throwing parts at these trucks can get real expensive real fast.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

Owner / operator, Patriot Automotive, N Ridgeville OH
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Old 01-22-2007, 08:00 PM   #8 (permalink)
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Re: Doesent start, glow plugs are good.

Is the relay supose to click continuously or just once?
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1989 E350 XL Extended body. 7.3 liter IDI, C6, 4.10, 175,000. I removed the seats and I use it for a cargo van. I purchased this van from a company in LA, CA and it had 117,000 miles. Since then I've replaced the Injection Pump, Injectors, 2 starters, lift pump, water pump.
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Old 01-22-2007, 08:24 PM   #9 (permalink)
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Re: Doesent start, glow plugs are good.

[ QUOTE ]
Is the relay supposed to click continuously or just once?

[/ QUOTE ]

Well - ordinarily the relay will turn on for 6 to 8 seconds, then cycle on and off for maybe 20 more seconds.

If it starts clicking on and off right away then it's not working right, usually because of bad glow plugs.

It's pretty easy to wire a manual control for the relay if you are having controller issues. I've added a manual control to every IDI I've owned.

I should also ask what brand of glow plugs you used. Autolite and Champion plugs have been known to burn out rapidly for some people. I know you said you tested them, but I'm trying to narrow down the issue.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

Owner / operator, Patriot Automotive, N Ridgeville OH
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Old 01-22-2007, 08:52 PM   #10 (permalink)
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Re: Doesent start, glow plugs are good.

When I turn on the ignition, the relay will click once, thats it, nothing during, or after the wait to start light goes off. I used motorcraft glow plugs thanks to the constant reminders on the dieselstop. I tested the relay and power is going to the small driver side terminal, and I get one click when I ground the small passenger side terminal(white wire). The manual control sounds interesting.
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1989 E350 XL Extended body. 7.3 liter IDI, C6, 4.10, 175,000. I removed the seats and I use it for a cargo van. I purchased this van from a company in LA, CA and it had 117,000 miles. Since then I've replaced the Injection Pump, Injectors, 2 starters, lift pump, water pump.
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Old 01-22-2007, 10:50 PM   #11 (permalink)
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Re: Doesent start, glow plugs are good.

I hope your glow plugs aren't staying ON! That is one thing I can think of that would draw more current than your alternator supplies.

Check the two large terminals on the relay. One is the feed from the batteries, the other is the wire TO the glow plugs. One will always be hot, the other should only have voltage for a short time.

In the vans, you can put a manual pushbutton right in the doghouse. Run a wire from the white wire terminal, through your pushbutton, and to good ground. It's best to use a pair of quick connects so that you can remove the doghouse from the van without having to unbolt the wires.

If your GP relay is staying ON all the time, disconnect the white wire from the relay, this will disconnect the controller from the relay.
__________________
1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

Owner / operator, Patriot Automotive, N Ridgeville OH
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