Cam Position Sensor - Ford Powerstroke Diesel Forum
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Old 05-19-2007, 12:41 PM
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Cam Position Sensor

Hey there. I'm new on here and just seeing if anyone can help me out. I recently bought a 97 F350 7.3. Truck was running sweet until i bought a ts performance chip, once I installed it, on came the problem. After the install, when I went to change different positions on the chip, the truck would stall out. It did it a couple of times but would always start back up. The last time it stalled out, i went to crank it back up and nothing. She'll crank all day but wont start. I contacted ts performance, not much help there. I was wondering if it could be the cam position sensor? When I go to start it, the wait to start light comes on which tells me the pcm is fine. But the tach dosent move. Just barely raises off its seat, and ive heard that its a good indication that the cps has sh!t the bed. I appreciate any input on the problem. Im sure some of you out there have had cps problems before. Is anyone running a ts chip, and did you have any problems with it?
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Old 05-19-2007, 12:48 PM
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Sounds like a CPS to me
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Old 05-19-2007, 01:05 PM
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sounds like the CPS. I'm running a TS and no problems with it but I don't think the tunes are right for my truck.
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Old 05-19-2007, 02:03 PM
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ya, thats what I was thinking also. Someone told me that it was the IPR valve (Injection Pressure Regulator). But I dont know about that. Its just hard to believe that the chip would make the CPS or IPR fail. But Im pretty sure its the CPS
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Old 05-19-2007, 02:15 PM
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Take the chip out and see if it starts. If it doesn't then I would see about replacing the CPS, but it does sound like you are describing a CPS gone bad.
Where are you located? If you are in the D/FW area I have a spare that we could put in and see if it runs.
Craig
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Old 05-19-2007, 02:20 PM
Jon
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Yes

I agree, take the chip out and check. I personally have never seen a tach move more then just a lil shake whil cranking with a good or bad sensor. I have never been able to use that as a diag tool. I could go out right now and my tach wouldnt move anymore with the cps plugged in or unplugged. As intermittent as your issue is it sounds like a cps but since you just introduced a new player to the game take it out and see what happens. Make sure you have cleaned the prongs really good. Also, I have seen more then one bad burns on these type of chips.
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Old 05-19-2007, 02:38 PM
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I pulled the chip out when it wouldn't start back up, no luck, still no start. I ordered two CPS's off the net today, figured id keep an extra one in the glove box. Cant beat it for 15 bucks each. I appreciate the offer, but im in florida. I believe im going to send the chip back also, they said they would check and see if the right programs are on it.
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Old 05-19-2007, 02:47 PM
Jon
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Codes?

Can you check codes for us? See if there is a 340 or 344?
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Old 05-19-2007, 03:02 PM
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Dont know, can you pull codes with the key on these. I am new to Fords, Im not use to working on these little diesels. If you can pull codes with the key, i can do that.
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Old 05-19-2007, 03:05 PM
Jon
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nope

Have to scan it. Do you have any friends with a superchip or hypertec or something? All you need it for is to check codes. I'm looking into buying a vin locked superchip tuner off ebay. You can find them for about 50 bucks. A lot of times most of the parts stores like advanced and auto zone have scanners that wont read diesels.
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