99 F350 won't stay running. Blowing PCM fuse. - Ford Powerstroke Diesel Forum
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Old 01-01-2010, 10:50 AM
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99 F350 won't stay running. Blowing PCM fuse.

I have a 99 F350 7.3L with almost 310,000 miles on it. The manufacture date on the door is July 98.

Now onto the problem. We had a really bad wind storm here in the southeast corner of Wyoming during Christmas for about 2 days and it packed snow into the engine compartment as my truck is parked outside. This has happened before with no issues of starting or anything.

When I went out to fire it up to let it idle and warm up on Christmas it started up fine and was idling but when I went out later it had died. I went and tried to crank it over again and when I had turned the key on to allow the glow plugs to warm, I noticed the "wait to start" light didn't come on. I left the key on for a few and tried cranking it and it cranked fine but wouldn't fire up. I ended up not messing with it any more that day and went back a couple of days later and when I turned the key on, same thing of no "wait to start" light. I pulled out the Ford service book to look for a glow plug relay fuse, but I didn't find one, but after reading my repair manual I realised it could be the PCM. Sure enough that fuse was blown. I swept all of the snow away from the glow plug relay thinking that may have been shorting things out. I replaced the PCM fuse and it fired right up, but right after it fired up it blew the fuse right away. I decided to just leave it and allow things to hopefully dry out as I figured that might have been the issue.

Today I went out and replaced the fuse and it fired up with no problems but then I noticed it started to surge when it idled and right when it surged, it blew the PCM fuse. I then replaced the fuse, fired it up again, and then just kept the throttle down and had it reving somewhat. It stayed running fine, but then after about a minute, I allowed it to go back down to idle and then it started idling irractically (surging) and right after that, blew the fuse again. I did not try to restart it as I am at a loss as to why once it goes to idling, it idles like it is surging and then blows the fuse.

Is this something indicative of the PCM going bad or being bad or could it be something else? One of the guys at the auto parts store had mentioned to me last night about the glow plug relay mounting bracket as being broke and an issue of blowing the PCM fuse but I looked at it and it is not broke. At this point I do not think it is something with the glow plug relay portion of starting as that is with start up and not with an engine staying running.

If this is a PCM issue, who has the best prices for ordering? That same guy from the auto parts store told me to look on Ebay for one if it is the PCM.

Thanks for any help you can give me on this as I haven't run into this before and I am stumped. -
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Old 01-01-2010, 12:14 PM
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If I knew your truck was considered a "late 99" (might apply to the early 99 as well though...) I tell you to unplug the heater in the bottom of fuel filter housing. That's what's blowing your fuse (#30 - right?) and the PCM is probably just fine....
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Old 01-01-2010, 12:55 PM
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Noralph, you are right. I had a gentleman on another forum make the same suggestion to me, but I didn't think that was right as when I had it reved it stayed running until it went to an idle.
I did unplug that heater in the fuel filter bowl and the truck is sitting outside idling right now as I am typing this reply.
Thanks.
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Old 01-01-2010, 12:56 PM
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Yes, it was #30 fuse.
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