Cmp

[troymn]

Hello. I have a 1997 2.3 xlt. Does the CMP do anything after start up? Thanks!

 

[Mark_88]

Hi, sorry, not sure what a cmp is...are you referring to the computer?

 

[RonD]

CMP should mean CaM Position sensor

Yes, it is used to fine tune sequential fuel injector timing and spark advance/retard
But it is not "required" for engine to run on most engines

Early fuel injection engines used Batch Fire injection, one step up from a carburetor.
Sequential injection could be done with a Crank shaft sensor, but was more accurate with Cam sensor, a distributor IS a Cam Sensor, same/same.
Cam sensor will give better MPG and lower emissions.

Crank(CKP) sensor is still the main sensor, engine will not start/run without CKP signal pulses.
CMP fine tunes CKP pulses for best MPG

 

[troymn]

Thanks Again!

 

[troymn]

I thought it just read the cam during start up so this is very good to know!

 

[troymn]

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.