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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 02-14-2013, 08:50 PM   #1 (permalink)
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1990 cold start problem

Changed all gp related items,wait to start light does not come on,but hear the gp cycling.changed the return lines,fuel filter and checked for leaks.spine motor 10 to 15 sec. 2 or 3 times see fuel smoke it finally starts but runs fast for a couple sec. Once started it starts fine until it,s cold. Will start on ether
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Old 02-14-2013, 10:32 PM   #2 (permalink)
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Check the wiring and terminals on both ends of the wires that supply current to the controller. The terminal ends have been known to disintegrate and cause your problem.
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Old 02-14-2013, 10:47 PM   #3 (permalink)
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1990 cold start problem

And the controller ground.


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Old 02-15-2013, 11:27 AM   #4 (permalink)
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Gp r working getting power to gp all new they r cycling.
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Old 02-15-2013, 01:13 PM   #5 (permalink)
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1990 cold start problem

How long do the GP's stay on before they start to cycle?


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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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Old 02-15-2013, 05:25 PM   #6 (permalink)
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Pardon me while I suggest this again, look at the terminals on both ends of the supply wires. Remove the nuts and inspect the terminals.
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'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 02-15-2013, 06:24 PM   #7 (permalink)
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They start pulsing when the key turned on. Test light on gp shows the light on and off 1 sec intervals. Mabe I donot under stand why I should check the wires if they are getting power to gp with new gp.
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Old 02-15-2013, 07:16 PM   #8 (permalink)
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For the third time, check terminals at both ends of the supply wires. What's the voltage at the supply side of the controller?
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Old 02-15-2013, 07:46 PM   #9 (permalink)
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Not sure but wil check tomorrow,but the amp gauge swings while it pulses
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Old 02-15-2013, 07:59 PM   #10 (permalink)
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Quote:
Originally Posted by Solow58 View Post
Not sure but wil check tomorrow,but the amp gauge swings while it pulses
When the amp gauge swings, it's your GP's drawing voltage while they try to heat up.

When you turn the key to run the first time in the morning, they should stay on for about 12-15 seconds BEFORE they start to cycle on and off. If they aren't doing that you need to CHECK THE TERMINALS at both ends of the supply wires and the ground from the controller to the block...
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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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