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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old Apr 12, 2023 | 10:14 PM
  #1  
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Starting problems

So little back round first. I am new to this group, but have learned a lot already so thank you in advance for all the support. I have a 1991 ford f350 dually 7.3 idi with a banks turbo kit (installed before I owned it.) A brand new transmission, radiator, batteries, starter, mlps, FIPL Glow plugs, and glow plug controller (wired to a button). Doesn't matter the temperature outside we have even been up to 90° F the truck has a problem starting if I don't hold the glow plugs on for a minimum of 10 seconds and will smoke white until completely warm( not billowing clouds as I have read about when it burns coolant but at definitely a good amount) after she warms up it stops smoking and can be turned off and on again very easy. I don't know how the power should feel when I WOT as it didn't run when I bought it for a measley $1200 so I don't have any information on that. Any help would be appreciated.
 
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Old Apr 13, 2023 | 06:07 AM
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Just a suggestion.
Install a check valve so fuel will not drain backwards to the tank while the truck sits for a while.
Something like this.

Amazon Amazon
 
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Old Apr 13, 2023 | 06:22 AM
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There is a dedicated sub-forum for the IDI diesel engines here: Pre-Power Stroke Diesel (7.3L IDI & 6.9L)

Those folks may be able to give you more insight on what to check.
 
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Old Apr 13, 2023 | 08:42 AM
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On those old IDI's
That wait to start lamp was always lit for at least 5 seconds anyway regardless of temp if i remember right
And yes they smoke
Worse when cold
 
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Old Apr 13, 2023 | 09:48 AM
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Originally Posted by manicmechanic007
On those old IDI's
That wait to start lamp was always lit for at least 5 seconds anyway regardless of temp if i remember right
And yes they smoke
Worse when cold
I have read though that that is not the case for all idi's just trying to get in best running condition possible before I start throwing Money into the interior. Trying to restore it the best I can for a 91.
 
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Old Apr 19, 2023 | 08:21 PM
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Alright everyone. Just tried the test where I loosened the b nuts for injectors 7,8,3. All had no effect on the way the truck ran. Also tried 2 and 5 made the truck shake hard.
 
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Old Apr 19, 2023 | 09:14 PM
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That means 7, 8, and 3 aren't working correctly. Time to check the compression.
 
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Old Jun 2, 2023 | 07:50 PM
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So I was pulling injectors and had this happen to one. The other piece is still in the head. And I have another one that is not wanting to budge will probably do the same thing. Any suggestions for removal?
​​​​​
 
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Old Jun 2, 2023 | 08:13 PM
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https://www.promaxxtool.com/extractors/p/powerpull
 
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Old Jun 2, 2023 | 08:54 PM
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Originally Posted by hobohilton
That puller is for the much newer 6.7l diesel. I'm not sure it'll work on the old IDI engines.

You can try to hydraulically eject the broken injector.
1. Remove the glowplug on the affected cylinder.
2. Set the piston on the affected cylinder to mid-stroke on the compression stroke.
3. Pour gear oil (or similar) into the affected cylinder through the glowplug hole.
4. Reinstall the glow plugs.
5. Rotate crankshaft using a ratchet in the harmonic balancer bolt to hydrolock the cylinder and force the broken injector out. It'll make a mess when it pops free.
 
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Old Jun 3, 2023 | 05:55 AM
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see if you can screw the top part of the injector back onto the lower part. than generously spray penetrating oil down the sides to try to loosen the carbon buildup on the tip.
 
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Old Jun 3, 2023 | 05:55 AM
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Originally Posted by hobohilton
that will not work on IDI injectors.
 
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