I need some help in understanding this C&P tech Service Bulletin ..... It talks about shimming the CPS sensor for closer contact with the trigger wheel .... Ive never seen this trigger wheel so I dont know for sure but if the sensor is not close enough in proximity to the trigger wheel wont shimming it place it even futher away from the wheel ...Isn't the trigger wheel just behind the inserted head of the CPS??.... I would think that you want to get it closer to the trigger wheel not futher away ...... What am I missing here?? .... My 95 PSD is certainly showing most symptoms of this problem and I want to correct it!!
Also what do they mean by extended cold soak?





Engine Controls - Low RPM, No Start, Runs Poorly
Article No.
03-21-23

10/06/03

DRIVEABILITY - LOW RPM - NO START - RUNS
POORLY - STALL - 7.3L DIT ENGINE

FORD:
1994-1997 F SUPER DUTY, F-250, F-350
1995-1997 E-350

Article 97-6-18 is being republished with updates as part of a consolidated 7.3L diagnostic aid booklet.

ISSUE

The 7.3L Direct Injection Turbo (DIT) engines are built with 0.1016-0.8128 mm (0.0040-0.032") clearance between the Camshaft Position (CMP) Sensor and the trigger wheel. At approximately 1.016 mm (0.040") clearance, the sensor will fail to synchronize and result in a no run condition. Improper CMP clearance can be seen in the following six (6) symptoms:

^ 1) Fault codes - incorrect synchronization count

^ 2) Low RPM - fails to achieve rated speed for 2-3 minutes after extended cold soak

^ 3) No start - after extended cold soak

^ 4) Runs poorly cold - engine runs OK warm

^ 5) Stall on deceleration - more pronounced cold

^ 6) Starts, runs cold, dies warm, will not restart until cool


ACTION

Install a shim between the CMP sensor and the front engine cover. The shim will allow the correct clearance which should reduce the possibility of concerns. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Perform normal DIT Powerstroke diagnostics. If no other problems are found, proceed with this TSB article.

2. Remove CMP sensor and inspect for signs of contact with the pulse wheel. Make sure the holes on the end are filled with epoxy and inspect the connector mating cavity for signs of oil contamination. If there are any signs of contact, contamination, or the holes are not filled, replace the CMP Sensor (F6TZ-12K073-A).

3. Repair symptoms 1) - 5) as follows: install a 0.254 mm (0.010") shim under the CMP sensor. If symptoms persist, increase the shim thickness to 0.508 mm (0.020") Shim (F7TZ-1 2J072-AA).

NOTE SOME ENGINES BETWEEN SERIAL NUMBERS 388840 AND 410010 HAVE BEEN BUILT WITH EXCESSIVE AMOUNTS OF TRIGGER WHEEL RUNOUT. RUNOUT OF THE TRIGGER WHEEL GREATER THAN 0.508 mm (0.020") MIGHT NOT BE RESOLVED WITH A SHIM. THE ADDITIONAL CLEARANCE CAN PUT TOTAL CLEARANCE ABOVE 1.016 mm (0.040") AND CAUSE FAILURE TO SYNCHRONIZE.

4. If symptom 6) occurs and trigger wheel runout is greater than 0.508 mm (0.020"), try a 0.254 mm (0.010") shim. If the concern is unresolved, replace the Camshaft Assembly (F4TZ-6250-A). Refer to the appropriate model/year Service Manual, Section 03-01C, for camshaft assembly replacement procedure.

 

Same question here--I got the blue cps about a year and a half ago and the description on the cps said it may need to be shimmed. 6 months ago the old cps crapped out whileon the road doing about 45(man its hard to stopthat thing without the power brakes) but i shoved the new one in bolted it down and it runs just fine.

 

i cannot count how many sensors i have replaced and i have yet to shim one.
what issues are you having?

 

Joe

Have not seen many.
It comes from a cam gear not running true and or the cam
thrust plate gap to large. The shims are a bandaid repair for
the real issue.
I would use a dial indicator on the cam gear to check runout and thrust on the gear.
I have to look up the spec if you need it.

Bill

 

Well my truck has been down for 2 months now and after having a technician put his computer on it and doing a complete scan and buzz test he determined that my ecm isnt getting a proper signal from the CPS and this is after changing out 3 of them ..... Ive also checked the harness for continuity and no problem there but when im cranking the tach is barely moving like maybe 50 rpm and sometimes nothing ...... My batteries are new, my starter new and im getting a strong crank ..... In fact ive practically changed everything under the hood trying to solve this problem
(check out my other thread on this problem https://www.ford-trucks.com/forums/7...help-guys.html)
.....new HPOP, new IPR valve , new fuel pump, new IPC sensor, new fuel bowl harness, new injectors which passed the buzz test BTW ..... If you got any ideas Please, Please share them .... I really need help here.

 

The CPS has 3 wires.
A= Ground
B= 5v ref
C= Sig return in HZ
Do you have a meter that will test Hertz (HZ).
Have access to scan?

Bill