ICP bad????????????? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 03-28-2010, 10:55 AM Thread Starter
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ICP bad?????????????

My early 99 psd turns over for a few seconds before it starts also has an engine miss til after the engine warms up and i get on it then it usually clears up . Sometimes i have to get on it several times for the miss to clear up but you can actually feel the truck have a lot more power soon as it clears up. It has done this since i bought it about 6k miles ago it shows no codes i have posted several times about it in past few months nobody can seem to figure it out please help it is really getting on my nerves . It has to be something sticking because why else would it clear up once its warmed up and you get on it a few times.

99 F250 Crew cab 4wd str8 pipe DIY intake 300k and counting
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post #2 of 6 Old 03-28-2010, 11:02 AM
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Diesels run by superheating the air on the compression stroke - igniting the fuel when injected. The glow plugs provide that added extra initial heat when the engine is cold. As you know, they sometimes won't even start without the glow plugs - but having a few bad glow plugs could be causing some cylinders not to fire until the motor comes to a sufficient temperature. I'd check them first - measure the resistance one by one at the valve cover harness.

The next thing that comes to mind is an injector that is sticky when cold, and frees up when warm. You could do an injector buzz test cold versus warm to see if any of the injectors seem different than the others.
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post #3 of 6 Old 03-28-2010, 03:58 PM Thread Starter
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all glow plugs ohm out fine, done the buzz test they all seem fine.

99 F250 Crew cab 4wd str8 pipe DIY intake 300k and counting
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post #4 of 6 Old 03-28-2010, 04:03 PM
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Have you done a compression test yet? Had a similiar problem on an 03, and it wound up being a weak cylinder when cold.
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post #5 of 6 Old 03-28-2010, 04:06 PM
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I would check the battery cables, connections, resistance in the wires and the voltage drop of every single wire on the truck. No one ever really thinks about wires, its overlooked.
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post #6 of 6 Old 03-29-2010, 03:00 AM Thread Starter
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no compression check yet still waiting to borrow a tester

99 F250 Crew cab 4wd str8 pipe DIY intake 300k and counting
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