6.9 shuts off by itself - Ford Powerstroke Diesel Forum
6.9L IDI Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 11-03-2009, 03:52 PM
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6.9 shuts off by itself

got a buddie with a 6.9 that just shuts off by it self like the injector pump is loosing power to the shut off but cranks back up some times
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Old 11-03-2009, 04:24 PM
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Run a wire from the battery positive to a toggle switch in the cab and then to the fuel solenoid. That way you can test the ignition switch and the wiring to and from. If it still has an issue I would bet on air getting into the fuel lines...
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Old 11-03-2009, 05:23 PM
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thanks i should have tried that, another question what is the second wire on the injector pump behind the fuel solenoid
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Old 11-03-2009, 05:26 PM
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Well I know there is a cold idle rpm solenoid that bumps the throttle lever up, one fuel shut off solenoid and one timing advance solenoid.
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Old 11-03-2009, 05:27 PM
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we just swaped engines out about 3 months ago cause the jasper engine developed a loud tick after glowplug replacement, he had another truck with a engine that was in better shape, so we swaped um out instead of trying to tear in to it. ran fine for the first month or so then he was going down the road and it just cut off like u turned the switch off, and now it will idel for about 5 min and just cut off no sputtering
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Old 11-03-2009, 05:36 PM
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Well I know they had issues with the ignition switches on the 87-93 mustangs and F-150's, it might be the same issue with the 250-up models also. I would try to diagnose it before throwing parts at it. Wire up a toggle switch, run it through the window, and drive on. If it still cuts off the solenoid could be failing its self or you have air getting in the lines, bad lift pump, etc.
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Old 11-04-2009, 11:24 PM
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Quote:
Originally Posted by 05strokinfx4 View Post
we just swaped engines out about 3 months ago cause the jasper engine developed a loud tick after glowplug replacement, he had another truck with a engine that was in better shape, so we swaped um out instead of trying to tear in to it. ran fine for the first month or so then he was going down the road and it just cut off like u turned the switch off, and now it will idel for about 5 min and just cut off no sputtering
Do these older trucks have anti-idle switches. My uncles '97 will shut off like that if no pedals are touched for 5 minutes.
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Old 11-05-2009, 08:23 AM
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Does it shut off suddenly, or idle, then slowly die out?

Sounds like the IP is going, they sometimes do that when they are older.
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Old 11-05-2009, 03:12 PM
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nah the ip was replaced in the 90's motor is out of a 85, sat for about 5yrs but always started up pretty easy with a little shot of starting fluid. it shuts of all of a sudden, and there are no fuel leaks or nothing the hose have been replaced couple yrs ago too
should get to straight wire it this weekend and see what happens
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Old 11-14-2009, 06:14 PM
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found the problem, the fuel pump solenoid was bad took it off and it was smoking. it was cutting off cause it was over heating and wouldnt cut back on i guess, swapped in another one and is running good now.
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