Problem with cylinder #4 not the injector? - Ford Powerstroke Diesel Forum
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Old 01-30-2011, 06:30 AM
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Problem with cylinder #4 not the injector?

I thought the injector was bad stuck open because it smokes continually and does not quite have the power it should. So I unplugged each injector to find out which one was bad and when #4 is plugged in or unplugged it ran the same with the same smoke. I then switched two injectors and the problem stayed with cylinder number four. I just did head gaskets and egr delete I have no check engine light. It starts up easy even when cold.Any ideas?
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Old 01-30-2011, 07:58 AM
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Suggest rerunning compression test on #4 also listen at #4 valve cover location for any unusual valve train noises.
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Old 01-30-2011, 09:08 AM
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I have the valve cover off and I dont see or hear anything unusual.
Why would it continue to smoke without the wire connected to that injector?
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Old 01-30-2011, 12:40 PM
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Just wondering while it was running I see oil coming out of where the round oil rail goes into the injector is oil supposed to come out of the injectors there?
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Old 01-31-2011, 01:48 AM
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You may have your problem there. If it is leaking oil there you are looseing part of the oil presure to operate that injector. It is probably stuck part way open all the time. Since fuel rail is under constant pressure the cylinder is getting fuel in it even when it shouldn't.

When the cylinder comes up on compression it has more fuel in it than it can burn, thus the extra smokeing. Replaceing the o-ring should solve the leak and a good fuel additive may free up the stuck pintle.
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Old 01-31-2011, 02:04 AM
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I should add that you may have washed out the oil film on that cylinder and there is a possibility of premature ring wear/damage to cylinder. You should run run a compression test before and after the repair. Let the engine run a little after the repair before running the test to give time for the rings to get reoiled, if they will.
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Old 01-31-2011, 05:19 AM
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Ok I can see oil leaking on all the injectors between the rail and the injectors some more than others. So it should not be leaking at all correct. What is the part number for the rail to injector seal? What could I of done wrong to cause this it didnt do this before head gaskets and the other side of engine seems to run excellant
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