camshaft position sensor

[omega_rugal]

is this thing really necesarry? some say the 4.0 works fine without it, the renix manual says is used to syncronize the inyectors or else the ecu will "guess" the inyection order which may or may not work properly, today i removed all the wiring for it on mine since i don´t use gasoline and noticed no change...

 

 

[Smokeyyank]

Since you're on lpg shouldn't need it. If I'm visualizing it correctly there is just a manifold for the lpg on the intake correct? 

[omega_rugal]

yes, a mixer to a plastic elbow and a long pcv pipe, no electronics just physics...

[DirtyComanche]

Most Renix era Jeeps don't have them working at this point.  Since you can't really tell the difference, nobody fixes it when it fails.

 

On my XJ the wires were all broken off.  So I fixed it.  I have no idea if anything changed after that. 

[Ωhm]

Even if the SYNC sensor is self-correcting, it still serves a purpose. Fix it, make it work. Don't force the ECU to go through its self-correcting phase every time you start the engine. Prevent longer crank times, better HOT starts and any other thing caused by NO SYNC sensor, until it self-corrects. Granted, INJ's put fuel into the manifold and the engine will start, but SYNC INJ's puts fuel where and when its needed most.

[DirtyComanche]

33 minutes ago, Ωhm said:

Even if the SYNC sensor is self-correcting, it still serves a purpose. Fix it, make it work. Don't force the ECU to go through its self-correcting phase every time you start the engine. Prevent longer crank times, better HOT starts and any other thing caused by NO SYNC sensor, until it self-corrects. Granted, INJ's put fuel into the manifold and the engine will start, but SYNC INJ's puts fuel where and when its needed most.

 

He really doesn't need it because he's not using his injectors for fuel delivery.

[Ωhm]

3 minutes ago, DirtyComanche said:

He really doesn't need it because he's not using his injectors for fuel delivery.

True, but my response was for those that do use MPI.

[cruiser54]

FWIW, the only time we replaced the sync generator at the dealership was when we noticed it working intermittently or not at all, while viewing real time sensor outputs with the factory tool.

 

It was never the cause of any running issues. 

 

Biggest cause of failure was oil coming up the dizzy shaft and leaking on to the sensor and out of the distributor.