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Old 04-22-2005, 04:27 PM
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tell tale signs of a bad cps

Just wondering what are some of the symtoms of a bad cps.
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Old 04-22-2005, 04:38 PM
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Diagnosis: A bad cam position sensor is usually signified by the PowerStroke motor abruptly and unexpectedly quitting. The motor may also be suffering from slight power loss and slight increase in fuel usage which is usually not noticeable until it is seen as an improvement when the sensor is replaced. When the CPS causes the motor to shut down, the tachometer will not register. If the motor fails to restart, the tachometer will not register when the starter is turning the motor over. This may or may not cause the check engine light to come on.

Part Numbers: The International parts are usually half the price of Ford's, and I wouldn't buy one from Ford unless you absolutely had to.

International part numbers:

A change occurred mid way through 1997, so if you have a 97 it is best to look at the engine serial number. For serial number before serial number 375549 use PN# 1821720C98. For serial number 375549 (including this number) and after use PN# 1825899C93.

Ford Part Numbers:

For 1996 and older use PN# F6T012K073A For 1997 and newer use PN# F7T012K073A


Remove/Replace: CPS replacement is a very simple process. It is located at the 10 o'clock position of the crankshaft pulley and secured with one 10 mm bolt. Removing the serpentine belt will facilitate the removal.

Step 1) Make sure key is off and disconnect battery or pull #9 fuse. This is always a good idea when working on engine electronics.
Step 2) Remove engine belt
Step 3) Unplug wiring plug from sensor by prying out on the little plastic tab and pushing it out of it's socket
Step 4) Use 10 mm socket with small extension to remove 10 mm bolt
Step 5) Clean any dirt or grease off of sensor and surrounding area to prevent contamination of crankcase oil and seal of new sensor
Step 6) Use pliers, pry bar, or whatever else to gently remove sensor by pulling it straight out. It may be slightly stuck and slight force may be needed to loosen it. It is ok to twist it in its socket to loosen it if necessary.
Step 7) Coat new sensor o-ring with clean engine oil and press sensor into hole.
Step 8) Replace 10 mm bolt, torque to 10 ft-lbs, or just make sure it is snug.
Step 9) Replace wiring plug by simply pressing it into position until you hear the holding tab click into place.
Step 10) Replace belt.
Step 11) Ensure battery has been disconnected or #9 fuse has been out for at least 30 minutes. After this amount of time, they can be replaced.
Step 12) Start engine and inspect for leaks or other problems. Make sure belt has been properly aligned on each of the pulleys.
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Old 04-22-2005, 04:46 PM
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Thanks a bunch, Today i was on the highway and the check engine light came on and all the power was lost until i put my foot on the gas. After i put my foot on the gas, everything went back to normal and i made it home. But now, i am scared to drive it anywhere 1995 f350 cc dually 2x4
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Old 04-22-2005, 04:46 PM
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When my would act up it would act like the ignition was turned off then on real quick while operating at a steady speed. It was usually so quick you could tell something happened but couldn't tell what. It would also stall either while at idle or when coming to a stop. When the engine stalled it would always restart. Eventually it set a code for intermittent cam sensor signal.
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Old 07-27-2013, 11:21 AM
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CPS?

My 2001 F250 7.3 cut off in the middle of the interstate in bumper to bumper traffic yesterday. Thought it was the CPS or fuel filter, but replaced the CPS and the fuel filter looked okay (although I didn't have one so I haven't replaced it yet). It was running rough and it will start occasionally and run really rough before cutting off. No check engine light. It's like it isn't getting any fuel, but other than that all the symptoms are similar to a CPS problem. Not sure if I have a bad CPS (even though it's new) or if it's something else. One thing I did not do was disconnect the battery for 30 minutes (it was only disconnected for 5 minutes tops). Any ideas or help?
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Old 07-27-2013, 03:11 PM
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Quote:
Originally Posted by mcachran View Post
My 2001 F250 7.3 cut off in the middle of the interstate in bumper to bumper traffic yesterday. Thought it was the CPS or fuel filter, but replaced the CPS and the fuel filter looked okay (although I didn't have one so I haven't replaced it yet). It was running rough and it will start occasionally and run really rough before cutting off. No check engine light. It's like it isn't getting any fuel, but other than that all the symptoms are similar to a CPS problem. Not sure if I have a bad CPS (even though it's new) or if it's something else. One thing I did not do was disconnect the battery for 30 minutes (it was only disconnected for 5 minutes tops). Any ideas or help?
Your 01 will have an electric fuel pump, turn the key to the run position, and check the fuel pressure at the schrader valve on the fuel filter. You can check it with a cheap pencil type tire pressure tester. I think you should have 40 lbs or better. If you don't have something around this pressure, you will know it is something in the fuel system, ie the pump, restriction in fuel line, power to fuel pump ect. You might get more answers if you posted in the Superduty 7.3 section.
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1997 F350 SRW Reg cab powerstroke 4.10, zf5spd 4X4, 3inch downpipe, 6637 mod, intercooler
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Old 07-27-2013, 03:53 PM
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Quote:
Originally Posted by farmert View Post
Your 01 will have an electric fuel pump, turn the key to the run position, and check the fuel pressure at the schrader valve on the fuel filter. You can check it with a cheap pencil type tire pressure tester. I think you should have 40 lbs or better. If you don't have something around this pressure, you will know it is something in the fuel system, ie the pump, restriction in fuel line, power to fuel pump ect. You might get more answers if you posted in the Superduty 7.3 section.
the 99 and up powerstrokes do not have a schrader valve on the fuel filter unless you install it.
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Old 07-27-2013, 08:37 PM
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Quote:
Originally Posted by mcachran View Post
My 2001 F250 7.3 cut off in the middle of the interstate in bumper to bumper traffic yesterday. Thought it was the CPS or fuel filter, but replaced the CPS and the fuel filter looked okay (although I didn't have one so I haven't replaced it yet). It was running rough and it will start occasionally and run really rough before cutting off. No check engine light. It's like it isn't getting any fuel, but other than that all the symptoms are similar to a CPS problem. Not sure if I have a bad CPS (even though it's new) or if it's something else. One thing I did not do was disconnect the battery for 30 minutes (it was only disconnected for 5 minutes tops). Any ideas or help?
Well, the first help would be to start a new thread, and then the help after that will be more than you could ask for. There are some good, knowledgeable guys on here.
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Old 07-27-2013, 10:12 PM
farmert farmert is offline
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Quote:
Originally Posted by helifixer View Post
the 99 and up powerstrokes do not have a schrader valve on the fuel filter unless you install it.
My mistake, thanks for the correction.
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1985 F250 Reg. cab 6.9,94 factory turbo, zf5 speed, 3.55 4X4, flatbed, dual 3.5in. stacks
1990 F350 SRW Crewcab 7.3 turbo 4.10 zf 5spd 4X4
1997 F350 SRW Reg cab powerstroke 4.10, zf5spd 4X4, 3inch downpipe, 6637 mod, intercooler
1996 F350 Crewcab dually 4.10, E4OD, 3" downpipe, 6637 filter
1996 F350 C&C Dually reg cab 4X4 flatbed Zf5 4.10, 3" downpipe, 6637 filter
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Old 07-27-2013, 10:12 PM
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