Escort L4-116 1.9L SOHC HO (1989)
NOTE:
THIS TSB ARTICLE SUMMARIZES THE QUESTIONS ASKED MOST FREQUENTLY BY CALLERS TO THE MOTORCRAFT "800" LINE
ABOUT THE MOTORCRAFT FUEL INJECTOR CLEANING METHOD. ALSO, A TOLL-FREE NUMBER IS AVAILABLE FOR ORDERING
CLEANING KIT PARTS, OBTAINING INFORMATION AND MAKING SUGGESTIONS.
Q. Why do we sometimes experience insufficient pressure to completely empty a cleaning can?
A. If the can is pierced properly, you will seldom experience problems with inadequate pressure. However, to further reduce those instances of
insufficient pressure to complete the cleaning process, Motorcraft recently made available a re-pressurizing device (S-79), which is included with all
CM1000 and CM1002 kits, and is also available separately. The device allows service personnel to repressurize the can using compressed air whenever
there is too little pressure to complete the cleaning procedure.
Although there have been some cases of actual low can pressure, by far, the largest number of low pressure complaints have been due to improper can
piercing. For best results, In addition to being hung upside-down, during the cleaning process, the can must also be upside-down pierced.
Q. Why is it imperative that the can be pierced upside-down?
A. Motorcraft fuel injector cleaner and the pressurizing gas are packaged together in an aerosol can. The piercing device contains a seal, which is
intended to seal against the threaded cup of the can before it is pierced. When using a new piercing device with a new seal, the can needn't be
upside-down. However, after a few cans have been pierced, the piercing device seal becomes compressed, and piercing can take place before the seal
makes full contact with the can.
The gas is always at the top of the can. Thus, if the can is pierced right-side up, the gas can rapidly escape before the seal makes full contact, resulting in
insufficient pressure to do the cleaning job.
If the can is upside-down when pierced, the liquid cleaner is in contact with the component being pierced, and the worst that can happen before the seal
makes contact is the loss of a few drops of cleaner.
Service personnel sometimes question the need to pierce the CM1001 cans upside-down, particularly if they have had experience with another injector
cleaner packaged in what is referred to as a "barrier pack" can. In this case, the cleaner is in an inner aluminum tube which is surrounded by the
pressurizing agent. In a barrier pack can, the pressurizing agent cannot escape unless a small rubber plug at the bottom of the can is removed.
Q. Why isn't CM1001 packaged in a barrier pack can?
A. There are several reasons. First, Motorcraft wants to provide an environmentally safe package, so it was decided to use compressed air or nitrogen to
provide the pressure. It was not possible to use either of these gasses in the barrier pack cans since the cans cannot contain the required pressure for
compressed air or nitrogen. Barrier cans generally use liquid propellant mixtures, and pressure is limited to 65-70 psig.
Also, with the barrier pack, upon completion of the cleaning procedure, a small amount of product remains in the collapsed inner tube, and the outer
shell still contains the liquid propellant, which requires proper disposal. When the CM1001 can is empty, neither product nor pressurizing gas remains in
the can.
Finally, the barrier pack can is considerably more expensive, and Motorcraft wanted to offer the most cost-effective cleaner possible.
Q. How can dealers obtain replacement and supplemental parts?
