I need to replace the CPS. (the hall effect sensor is missing) I took it to a mech who said the syncronizer (he called it the shaft) was shot also. I looked at it and what I saw was a half circle pipe looking thing. But nothing looked broken. What my Question is, what is the syncronizer supposed to look like. I searched the posts and found a vague description that matches what I saw, but something a little more detailed would help. I'm replacing the sensor in the a.m.

Thanks.

mfossler 98 F150 Jasper 4.2 (after the dreaded knock) 5 speed manual, stock

 

The synchronizer replaces the distributor on engines with HDR EDIS ignition. It looks just like the bottom half of a distributor, minus the cap, rotor button, etc. The cam sensor sits on top of it, and it gives the PCM a reference as to when to fire what injectors.

Usually what happens is the half moon part in the synchronizer shaft breaks and takes out the CMP sensor. The bearings in them wear out too, sometimes they'll make a high pitched chirping noise and turn the check engine light on, with CMP codes (usually P0340). It's highly recommended to replace both as an assembly, since usually when the CMP breaks, it's caused by the synchronizer shaft.

Be advised, if you decide to replace the synchronizer shaft yourself, it's critical that you get the new one aligned properly before trying to start the engine. The PCM uses this thing to determine when to fire the injectors. Best case if misaligned, the engine will idle weird and lack power, worst case the injectors will fire at the wrong time, filling a/an cylinder(s) with fuel and hydrolocking the engine. There's special tools to ensure that the synchronizer is aligned properly, you should be able to rent 'em at AutopepadvanceboysO'ReillysZone. Bring the engine up on #1 TDC before removing the old shaft.