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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 12-06-2011, 08:28 AM   #1 (permalink)
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7.3 Glow Plugs

Hello,
I have a 88 7.3 and I can't get the glow plug light to stay on for more then 2 seconds in the morning. Mornings have been cold and it's very hard to start. I have tested the glow plugs and I replaced the controller. Any thing else I can check as to why they do not stay on long. Thanks!
Derrick
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Old 12-06-2011, 12:08 PM   #2 (permalink)
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1 or more bad plugs, and/or bad wiring between the controller and plugs.
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1991 F350 Lariat XLT, 7.3l, 5-speed, crew cab, SRW, 3.55, 2WD.

1990 Jeep Wrangler Sahara, in the process of a major overhaul/upgrade. OM617 on the horizon! Front & rear Dana 44s from a Wagoneer till I get some 1-ton axles built & narrowed, and eventually a front shackle reversal. Diesel YJ, bay-BEE, and not a cookie-cutter 4BT conversion!
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Old 12-06-2011, 01:06 PM   #3 (permalink)
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One other factor is the need for a GOOD GROUND from the controller to the engine block.
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Old 12-06-2011, 07:57 PM   #4 (permalink)
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Thanks guys!! I will check it out tomorrow and let you know.
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Old 12-06-2011, 08:17 PM   #5 (permalink)
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Did you test with a 12v light? If so its still possible some of the GPs could be bad. The definative test is with an ohm meter but the value is so small (1 ohm) that is a difficult test to conduct.

You might want to try a global GP change.

My 02.
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Old 12-06-2011, 10:50 PM   #6 (permalink)
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Did you test with a 12v light? If so its still possible some of the GPs could be bad. The definative test is with an ohm meter but the value is so small (1 ohm) that is a difficult test to conduct.

You might want to try a global GP change.

My 02.

I put new GP's in it.
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Old 12-07-2011, 05:14 AM   #7 (permalink)
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I put new GP's in it.

Did it help?
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Old 12-07-2011, 09:53 AM   #8 (permalink)
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Did it help?
No it didn't make any difference.
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Old 12-07-2011, 07:52 PM   #9 (permalink)
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what brand of glowplugs did you install
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Old 12-07-2011, 09:05 PM   #10 (permalink)
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Time to check continuity in the glow plug wires.
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Check my lists of common part numbers in my photos! Updated often!

1991 F350 Lariat XLT, 7.3l, 5-speed, crew cab, SRW, 3.55, 2WD.

1990 Jeep Wrangler Sahara, in the process of a major overhaul/upgrade. OM617 on the horizon! Front & rear Dana 44s from a Wagoneer till I get some 1-ton axles built & narrowed, and eventually a front shackle reversal. Diesel YJ, bay-BEE, and not a cookie-cutter 4BT conversion!
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Old 12-07-2011, 09:32 PM   #11 (permalink)
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i always check the glow plugs with direct power and an ampmeter even new ones when you put power to the plug the ampmeter will register if the plug is good if weak barley any amp. will flow do not leave the power on more than 2 seconds the plug gets very hot quikly . test all glow plugs this way . if the all pass . then the controller cuircut could be bad . if the wait to start light on time is short it most likely plugs the sequence you use to diagnos is critical because if the controller is bad the plugs you put in are new but the controller burned them then you assume they are new then then the controller gets changed but the new plugs are now burnt also for some reason the driver side battery is weak it affects the glow plug system an other thing is the battery cable condition this being an older truc k that is apossibility hope this helps
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Old 12-08-2011, 12:28 PM   #12 (permalink)
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Thanks Guys!!
I'm going to get it in the shop today or tommorow and see what i find out.Yesterday I crossed the terminals on the solinoid for 8 sec's thinking it should start right up but I was wrong again.
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Old 12-08-2011, 06:47 PM   #13 (permalink)
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what make of glow plugs did you use
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