Weird problem, not sure what to think - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 01-14-2013, 03:57 PM Thread Starter
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Weird problem, not sure what to think

So I had something interesting and frustrating happen this weekend. I was up in Grand Lake (in the mountains of CO) this weekend. I had the cabin plugged into my truck last night. I went out to start it about 9am and it started up just fine. I put my tuner on high idle and let it warm up for about 10 minutes.
I pulled out the drive way and started to back down the drive to hook up the snowmobile trailer and my truck started sputtering. I gave it some gas and it sputtered and shook and turned off. I tried to start it and it cranked just fine but seemed like it wasn't getting enough fuel, or any at all. I pulled the fuel bowl cap and saw plenty of fuel but it seemed like the bowl had a slight vacuum. I put the cap on the truck started then sputtered and died. It then would not start and I drained the fuel bowl and cycled the fuel pump a few times and then tried to start the truck, and it just cranked. I came back about half hour and jumped the truck, I figured the batteries might be a little low. I cycled the key a few times and could hear both fuel pumps "working". I started the truck and it died after 30 seconds. I cycled the pumps about 5 more times and started the truck. It idled just fine. I took off the jumpers, the truck ran fine. I had no more problems and drove it around the rest of the day and made it back to Denver (170 miles) just fine.
Anyone have any thoughts on this. Everything pointed to the fuel pump for me, but that seems to not be the issue. I'm not sure where to go from here....

1999 F250 XLT 4X4


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post #2 of 12 Old 01-14-2013, 05:38 PM
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CPS is my bet...

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post #3 of 12 Old 01-14-2013, 06:13 PM Thread Starter
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Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

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1999 F250 XLT 4X4


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post #4 of 12 Old 01-14-2013, 06:21 PM
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yep I've heard that too

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post #5 of 12 Old 01-14-2013, 06:28 PM
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I sell quite a few of those!!


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post #6 of 12 Old 01-14-2013, 06:36 PM
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could the fuel in tank/lines be gumming up and restricted due to cold weather?
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post #7 of 12 Old 01-14-2013, 06:52 PM
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Quote:
Originally Posted by rocktamer View Post
Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

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Quote:
Originally Posted by 7.3HeavyHauler View Post
yep I've heard that too
Not necessarily. The original one on my 7.3L lasted about 120,000 and when it decided to go my truck started up and ran for 20 seconds then died. I cranked for about 45 seconds and got nothing. I let it sit for 15 minutes and it started up and ran for 10 minutes. It then died and started immediately back up. Got to where I was going and changed it. The problem didn't return until recently at 240,000. This time it would die randomly every few days as soon as I started the truck up when it was cold.

My point is that these sensors have a mind of their own. Some die for good and some are intermittent. At least if it doesn't fix your problem you are not out a ton of money.

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post #8 of 12 Old 01-15-2013, 06:01 AM
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Quote:
Originally Posted by rocktamer View Post
Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

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cam position sensor i believe

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post #9 of 12 Old 01-15-2013, 06:07 AM
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cam position sensor i believe
you are correct!
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post #10 of 12 Old 01-15-2013, 09:01 AM
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I've had my truck for 160K miles and never had to replace mine.

That being said, I have one in the glove box just in case.

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