From Mechanical Database
Mopar Combustion Chamber Cleaner/Conditioner is really good for removing carbon deposits. It works very similarly to Seafoam. The following directions outline the way that professional mechanics have been using the cleaner for years. They were finally published in TSB 18-31-97 for 1996-98 Jeep 4.0 Liter misfire conditions:
- Run the vehicle until the vehicle reaches operating temperature.
- In very rare cases this can cause dropping of the valve seat. Performing this when the engine is cold may be a safer alternative, although it's effects will be somewhat diminished.
- Remove the air tube from the throttle body.
- With the engine at an idle, spray the entire contents of Mopar Combustion Cleaner, p/n 04318001, directly into the throttle body. Allow the vehicle to load up with the cleaner to the point of almost stalling out.
- Shut the engine OFF after the entire can is ingested.
- With the hood closed and the vehicle parked inside the garage, allow the vehicle to soak for two to three hours. This will ensure that the engine will maintain its temperature and will allow proper solvent penetration.
- Drive the vehicle on a highway/freeway that will allow the vehicle to be driven safely at the posted speed limit. Upon entering the highway/freeway, accelerate hard to the posted speed limit and maintain speed. Slow down and then perform 5 to 10 Wide Open Throttle (WOT) upshifts. Continue driving at the maximum speed limit for 1-2 miles (if conditions allow).