Hello.I have a 1997 xlt 2.3. Does the cmp do anything once the engine is running? Thanks!

 

CMP = Cam position sensor

Cam sensors were added to increase accuracy of sequential fuel injection.
So yes they are used when engine is running, but are not "required" for engine to run.

The Crankshaft position(CKP) sensor is the main timing sensor on distributorless engines, computer uses it to set spark and injector timing, engine will not start without its "signal" pulses.

But a crank sensor is not as accurate as a Cam sensor
Cam sensor fine tunes injectors and spark for best MPG and lowest emissions

 

Thanks RonD!

 

Can I replace it without pulling off the timing belt cover? I got the bolt out but it doesn't seem to wanna come loose. Did not pry super hard cause I was on my break at work and didn't want to get stranded there longer then I had to.

 

Yes, it is replaceable without taking off timing belt cover

There are TWO bolts

Drawing here: http://www.explorerforum.com/photopo...or_95-97_b.gif

No retiming is needed for this cam sensor replacement, like on the 3.0l and 4.0l OHV engines

 

Haha, seen that the old one has 2 bolts as the new one only has one. Comes right out with them both out. Had a case of the mondays I think.

 

Just a heads up

90% of sensors or engine electrics replaced by DIYers were working fine, people often replace parts like these on speculation
Sensors rarely fail.
You read alot about people replacing sensors...............becase 90% of them do and shouldn't have, lol.

Before buying sensors you should buy:
Volt/OHM meter, $20
Vacuum gauge, $20
Bluetooth OBD2 scanner, $30

Pretty much any sensor or electric part can be tested with meter

All gasoline engines are self power air pumps, no matter how many sensors or other parts they bolt on to the outside, they are still just air pumps
So a vacuum gauge can tell you ALOT about a running engine

OBD2 is the communication software required by LAW, to be used on ALL vehicles sold in North America since 1995.
So if you plan on owning any vehicles for the next few years, then an OBD2 scanner will be worth the cost
The Bluetooth units are cheaper because you need to use YOUR smartphone or a Tablet/laptop as the display to see the data.
Yes, these read codes but do a whole lot more, like LIVE engine data while driving, you can see what each sensor is reporting to the PCM(engine computer), and what the PCM is doing with that data.