02 F250 won't stay running - Ford Powerstroke Diesel Forum
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Old 02-02-2014, 02:02 PM
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02 F250 won't stay running

Excuse me for this being my first post. I have been trying to diagnose this issue for over a week.

Its a 2002 F-250 with a 7.3L 4x4 Crew Cab with 273k miles. It has a 6 position TS performance chip.

We have had an intermittent issue with the power windows not always wanting to work and the radio doesn't always have power right away when you start it. I believe this to be a VSM issue.

Last week I attempted to start it (truck no longer has DD duties so it doesn't get driven that much anymore) so I could get my trailer out and it fired right up, then immediately shut off. It did this a few more times. While waiting for the glow plug light to go out during one of the starts all of the needles on the gauges spiked then returned to zero. First and only time I have seen it do this. I got it to stay running by flipping my chip to high idle after it started, after it warmed up a couple min it would idle normally. It sat a couple days and then had the same issue. Sat another day and the high idle trick quit working. Gave the VSM a couple love taps and she fires up and idles.

I'm confused and need to have it in a condition that I'm not afraid to put the wife and kids in it and send them down the road. Wife uses the truck when roads get crappy and may need 4wd.

Can the VSM cause the engine to shut down?

Any help would be greatly appreciated.

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Old 02-11-2014, 09:00 AM
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Still having issues with this thing. When its cold it wants to shut off after a few secods of running. I was able to do the high idle trick last night and then it was fine. While running at high idle you can hear it cut out a few times but pick right back up. Its like someone turned the key off and then right back on.

I have been searching all over to find out what the VSM actually controls without any luck. A wiring diagram would be really helpful.

Anyone have any ideas. I even swapped my spare cam position sensor in with no luck.
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Old 02-11-2014, 11:28 AM
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Could be all kinds of stuff, nothing would narrow it down quicker than a good scanner to monitor the sensors when this happens. I'd be watching the IPR valve maybe, you could give it a look to see if the plug & wires look intact and that the "tin nut" hasn't fallen off the stem. You never get an SES light?

On the electrical side, could be a bad connection somewhere, especially with the windows & radio issue BUT, the VSM is just the "Body Control Module" and shouldn't be doing much to the engine.

You talk about "tapping" it though,,, behind the Radio? That's where your VSM is located. You're not talking about the PCM? Behind the Fusebox?

If so, and you have a Tuner attached, I'd take that off. A bad connection to the board does strange stuff. Take it off in any case and see. Also, because it's an '02, have a look at the connector that feeds the fusebox and makes the transition to fuseable links. It's under the hood, next to the airbox, attached to the top of the fenderwell, under a cover marked "Caution High Current" and about 1sq". A corroded connector there also does strange electrical things
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