What does a Camshaft Pos Sensor do?
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Senior User
Joined: Jan 2004
Posts: 287
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From: Gainesville, Texas
What does a Camshaft Pos Sensor do?
ok what does a Camshaft Position Sensor (CMP Sensor) actually do? Why the heck is it so important to cost so much? and what would cause one to go bad?
Senior User
Joined: Jan 2004
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From: 29 Palms, CA
The new one I installed today eliminated my truck from freakin' stalling on me. Get this...the stealership wanted $130 to replace it. One 10mm deep socket and 15 minutes of wrestling it was done. 
for do-it-yourselvers, 
to the stealerships. As for other "technical explanation" I'm sure a gearhead will chime in on this.
for do-it-yourselvers, to the stealerships. As for other "technical explanation" I'm sure a gearhead will chime in on this.
Posting Guru
Joined: Oct 2000
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From: Western NC
Basically, I think it "sees" or "counts" the revolutions of the cam shaft, then sends a signal back to the main computer which tells it that it's OK to send more fuel. If the sensor goes bad, there is no such signal, so the computer shuts off the fuel supply and the truck stops.........
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Joined: Nov 2000
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From: Cincinnati, Ohio
RedTaurus94 is on the money. The cam position sensor keeps tabs on exactly where in the four stroke revolution pattern the engine and valve train is so the engine control module can "tell" the injectors exactly when to fire. It is one of many inputs to the engine computer that affects how the truck runs. Without a signal from the CPS the computer does not know when to fire the injectors so it does not fire them at all.
Dave / Believer45
Dave / Believer45
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Senior User
Joined: Jan 2004
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From: Gainesville, Texas
well is it my CMP sensor going out.....
i can start my truck up and drive for awhile and out of no where the truck starts kicking, and occasionally dies, but if i put it in neutral and kill it then start it back up every thing goes back to normal. Can the CMP sensor mess up for a couple of seconds or does it just go out and the truck doesnt run?
i can start my truck up and drive for awhile and out of no where the truck starts kicking, and occasionally dies, but if i put it in neutral and kill it then start it back up every thing goes back to normal. Can the CMP sensor mess up for a couple of seconds or does it just go out and the truck doesnt run?
Posting Guru
Joined: Nov 2000
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From: Cincinnati, Ohio
Can the CMP sensor mess up for a couple of seconds or does it just go out and the truck doesnt run?
Dave / Believer45
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From: 29 Palms, CA
85351ho is correct and I forgot to mention that I paid $87 total for the CPS at International parts dealer.
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Joined: Aug 2003
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From: Arizona
Intermittent
On my 99 the problem was intermittent stalling. Usually at idle and not while driving under power. It became gradually worse. Finally got around to changing it out last Friday and no problems since.
p.s. a very easy installation.
p.s. a very easy installation.
Last edited by rdually; Jun 11, 2004 at 12:36 AM.
