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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 03-21-2007, 06:26 PM   #1 (permalink)
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Glow plugs not heating

Hello, we have an ex uhaul 14ft truck, it has a 1990 7.3L non turbo.

The glow plugs are not heating up when you turn the key on.

What are some things we can look for besides the usual loose wires?

I'll pop in and out over the next few days to answer any ?s you may have or check out any suggestions.


Thank you,
Denise
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Old 03-21-2007, 06:34 PM   #2 (permalink)
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Re: Glow plugs not heating

search this forum, there are a ton of answers about GP. they probably, need to be replaced.
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Old 03-21-2007, 07:02 PM   #3 (permalink)
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Re: Glow plugs not heating

First off, Welcome

Does the wait to start light come on, and if so for how long?

Does the volt meter drop and then cycle up and down?

Check the ground wire from the controller to the valve cover, make sure its tight and clean.

Test each glow plug with a test light or ohm meter. Replace only with Motorcraft/Beru ZD9.
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Old 03-21-2007, 09:07 PM   #4 (permalink)
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Re: Glow plugs not heating

yes thank you I will be searching and reading

hubby is on the road and I need to find things a little quicker than I can read on the computer screen

Denise
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Old 03-21-2007, 09:14 PM   #5 (permalink)
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Re: Glow plugs not heating

Thank you for the welcome.


Does the wait to start light come on, and if so for how long? Yes it does but then goes right back off, even when the engine is cold.

Does the volt meter drop and then cycle up and down? Not sure I will ask him next time I speak with him.

Check the ground wire from the controller to the valve cover, make sure its tight and clean. I am sure this is one of the first things he did, but will remind him to check and clean all wires.

Test each glow plug with a test light or ohm meter. Replace only with Motorcraft/Beru ZD9. I'll ask if he has his meter with him. Are these available other places beside a dealer? Not sure what is in the area where he is tonight.


Thank you for your input.
Denise
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Old 03-21-2007, 10:57 PM   #6 (permalink)
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Re: Glow plugs not heating

Autozone has the Motorcraft/Beru glowplugs. Good luck with that thing...diagnosing/repairing things on the road is such a pain.
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Old 03-21-2007, 11:12 PM   #7 (permalink)
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Re: Glow plugs not heating

If the WTS light is staying on a very short time I would suspect one or more glow plugs are bad. Bad glow plugs trick the controller into thinking the plugs are hot and short cycling.

If he has anywhere to plug in the block heater for a few hours it should start without the glow plugs.
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Old 03-23-2007, 01:32 PM   #8 (permalink)
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Re: Glow plugs not heating

Autozone has the Motorcraft/Beru glowplugs. Good luck with that thing...diagnosing/repairing things on the road is such a pain.

Thank you, he is at an event for the remainder of the week and will hit an autozone Monday. Yes on the road is a pain for d/r but when that is where you make your living that is where you do it.

Thank you,
Denise
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Old 03-23-2007, 01:38 PM   #9 (permalink)
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Re: Glow plugs not heating

Yes, You do what you must.

It sounds like the controller is working, or you would not be getting the wait light.

For $10 a piece, he might just wnat to change them all. Also make sure the connections are good and tight. Sounds like the tyical burnt out glow plug issues we have all been through.

If he gets a test light and hooks it to the positive battery lug. Then remove the wire and touch the plug, if it lights the plug is probably good, if not it is bad.

good luck. Where is he(city), maybe someone can stop by and help him?
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Old 03-23-2007, 01:43 PM   #10 (permalink)
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Re: Glow plugs not heating

If the WTS light is staying on a very short time I would suspect one or more glow plugs are bad. Bad glow plugs trick the controller into thinking the plugs are hot and short cycling.

Thank you, that pretty much confirms what one of the guys at the flying j was telling him. He can handle the repairs even to the point of a rebuild but diagnosing is a different story.

If he has anywhere to plug in the block heater for a few hours it should start without the glow plugs.

[img]/ubbthreads/images/graemlins/eek.gif[/img] we found out that the ford dealer that did the engine swap last summer cut the cord out, guess who I get to be on the phone with next week [img]/ubbthreads/images/graemlins/mad.gif[/img] fortunately we live in a warm climate

Thank you,
Denise
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Old 03-23-2007, 01:54 PM   #11 (permalink)
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Re: Glow plugs not heating

For $10 a piece, he might just wnat to change them all.

That is what we figured on, going to have it opened up may as well do it all at once.


Where is he(city), maybe someone can stop by and help him?

This week Waco, TX. He will do the work Monday then head on to LA.

Thank you,
Denise
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Old 03-23-2007, 04:29 PM   #12 (permalink)
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Re: Glow plugs not heating

The cord to a normal block heater just plugs into the block heater above the starter. Pass. side. Do not know if the u-haul one is the same.
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Old 03-23-2007, 04:41 PM   #13 (permalink)
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Re: Glow plugs not heating

Denise,

Welcome to TDS [img]/ubbthreads/images/graemlins/smile.gif[/img]

When you get a chance, please fill in your truck and location info. Login, then go to "My Home" above, click on "Personal Info" and add your Ford truck details to your signiture and also your location and any other info that you want others to view.

Quick joke:

An expectant mother of twins was driving through town one day and got into a car accident. She was rushed to the local hospital where she delivered two healthy babies, a girl and a boy. Both mother and babies were fine. After the birth, the twins were taken to the nursery for routine tests. A short time later, the mother asked to see her babies so that she could get to know them and name them.

The doctor replies, "no need to name them, your bother has already done that for you.

The mother replies, "My brother? He is an idiot...what did he name them???"

Dr. "Well, the baby girl, he named Denise".

Mother "Oh, Denise...that is a really pretty name. What did he name the boy?"


Dr. "Well, for the baby boy, he named De-nephew".



Enjoy,

Hugh
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Old 03-23-2007, 06:39 PM   #14 (permalink)
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Re: Glow plugs not heating

You can buy a new cord.... or if the heater end is still attached with sufficient extra to scab in a bit of wire and a plug.

Read ... http://www.members.shaw.ca/k2pilot/ re GP removal.....

I sent you a PM (private message) re the GP controller test, click on the flashing envelope, if you got it......email me.
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Old 03-24-2007, 06:24 PM   #15 (permalink)
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Re: Glow plugs not heating

The cord to a normal block heater just plugs into the block heater above the starter. Pass. side. Do not know if the u-haul one is the same.

Not sure what uhaul may have done with it, they did change a few things under the hood. Hubby found the heater cord underneath the back of his seat while looking for a loose socket. It was a bit of a surprise.

He'll wait till he gets home next month to fix that one.

Thank you,
Denise
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