6.9 sticky injection pump
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Joined: Oct 2004
Posts: 2
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From: Independence, IA
6.9 sticky injection pump
I have a 86 f-250 HD with 6.9. All factory, 315,000 miles, Good ol girl. Starting mid summer the injector pump starting sticking. If I give more fule it will stick there until it seems the motor gets up to the rpms that the injector is trying to run then unsticks. Its fine unless you are flooring it to climb a hill, pulling something, or trying to accelerate quickly ( err. as fast as a 6.9 truck will accelerate). This is my everyday driver and it starts and runs great. If you accelerate slowly it responds fine also. What would cause it to stick if you give it more fuel than needed but then unstick when the motor gets up to RPM? Anyone else have this problem? I have been dealing with it but I live in Iowa so weather getting cold. That requires me to hit the fuel in morning to go to fast idle and it sticks higher than needed and makes a much harder and violent start. Thank you
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
I would tend to believe that the throttle cable itself is causing the problem. I had one that frayed internally and would act much the same way - sometimes it would not accelerate and then it wouldnt come to idle. Try disconntecting the throttle cable from the pump and see if the throttle lever moves smoothly or hangs up and do the same with the cable. Hope this helps you out.
Posting Guru
Joined: Sep 2002
Posts: 1,897
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From: Northeastern Pa - USA
If you are still having the same problem, then the throttle shaft is probably eroded internally and hanging up. It probably wont heal and the only fix I know of is a rebuild. Go for the rebuild with the chromed sleeves. Bill
Posting Guru
Joined: Sep 2003
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im not sure if it will help you any, but when mine starts acting funny, i just put a quart of ATF dexron with mercon in my diesel tank. after i run that tank, it seems to do better. i have also used 2-stroke engine oil and lucas fuel treatment. a quart of any of these is enough for you. i would try this before a rebuild and it sure won't hurt the engine. i wouldn't try it if it gets really cold up there because it may gel up, but i would do that before i'd try a 1000 dollar or so pump rebuild someone said something in a previous post about sticky governor weights inside the inj. pump, just trying to save you a buck or two.
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