Bad Cam Position Sensor? - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 03-05-2008, 08:27 AM Thread Starter
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Bad Cam Position Sensor?

I drove to work and parked my truck. When I went to leave it would just crank but not start. It would crank at normal speed for a few seconds and then it would act like the starter is bogging down. Its not the batteries losing power, I know that. Its like something else is making it slow down a little. Also there was some "smoke" coming out of the exhaust after I had tried starting it for a few times. Im not sure if it was actual smoke but it was greyish. So I towed it to the dealer. Does this sound like that sensor? Sorry if there has been alot of posts about this, I just had trouble finding one with the same situation. Thanks guys

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post #2 of 15 Old 03-05-2008, 08:44 AM
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Maybe glow plugs?

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post #3 of 15 Old 03-05-2008, 09:08 AM Thread Starter
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Anybody else have some opinions?

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post #4 of 15 Old 03-05-2008, 09:38 AM
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When cranking the truck, does the tach move or bounce any? If not the CPS is the problem. A lot of guys buy an extra 1 and keep it in the glovebox because it is a common problem with the 7.3. Hope this helps.

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post #5 of 15 Old 03-05-2008, 09:52 AM
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this probably isnt much help to you, but a work truck i was driving last fall with a 7.3 shut out on us while driving to a job and wouldnt start. after 45 mins of searching everything to the naked eye on the side of the road that couldve shut the truck down and not allow it to start with the road mechanic as well, there was a fuse under the hood (i want to say it was a 20amp fuse) that had blown. i wish i could remember what number/what it controlled...

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post #6 of 15 Old 03-05-2008, 10:35 AM Thread Starter
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The tach does bounce when its cranking, what does that mean? Also what was the "smoke" coming out of the exhaust and is that a really bad sign?

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post #7 of 15 Old 03-05-2008, 10:42 AM
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Well, if the tach is bouncing the CPS is good. The smoke is just where it has injected fuel and is not firing. Nothing major. When you do get it started it will probably smoke quite a bit for a while but it won't hurt anything. I'll do some diggin and see if I can help on the no start.

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post #8 of 15 Old 03-05-2008, 10:53 AM Thread Starter
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ok tell me what you think of this. Yesterday I towed it down to the dealer and told them to replace the recall because thats what I though it was. I just got a call back saying, your truck is ready and we put a new glow plug relay in because the cps wasnt the problem. Your bill is 196 dollars. WTF!? I thought they had to call and get permission to work on a vehicle beyond what was discussed at first. I never said, Geti it running whatever you have to do. I said fix the recall. What should I do, is there anything I can do?

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post #9 of 15 Old 03-05-2008, 10:57 AM
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I used to work at a dealership, and unless you signed something saying it was okay to repair, then yes they are suppose to get permission. What recall was it? They might have had to get it running for the recall to be performed. If not, go in and talk to the service manager and tell him you never gave them permission to repair the truck.

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post #10 of 15 Old 03-05-2008, 11:02 AM Thread Starter
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It was the cam shaft postion sensor recall that I thought was the problem. Thats what I said to fix. They said they put that part in and it still wouldnt start. I mean I dont know what to do. Should I call them and say take the part off because I didnt authorize that. I dont expect them to leave the part on and let me walk out the door free of charge because they didnt get my permission. So are my options basically these, take the part off and I will tow my truck home or pay for the service right? There isnt much I can do is there. I just dont want to get really heated and be a jerk all over some little part but I know I could buy a relay and replace the thing myself for half of that ya know? Any more advice you have?

2001 F250 CC SB
5 In exhaust made by me
DP-Tuner 80 tow, 80 econ, 140 aggressive SWEEETTT
Boost Controller
AFE Intake
Leveling Kit w/ 35x12x16
Projector Headlights
New MB Wheels
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