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Cleaning the Throttle Body of Mopar V6 and V8 Engines

Although John is a dealership technician with 20 years of experience, neither he nor Allpar can be responsible for the accuracy of this information or the consequences of using it. Read and act at your own risk.

Cleaning the throttle body of 3.9 V6, 5.2 (318) V8, and 5.9 (360) V8 engines

Cleaning the throttle body of 3.0 and 3.3 liter V6 engines

Cleaning the throttle body of 3.5 liter V6 engines*

Using a spray can

Greg Smith posted this at It was not written by John Mastriano!

Mopar Combustion Chamber Cleaner/Conditioner is really good for removing carbon deposits...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:

  1. Operate the vehicle until the vehicle reaches operating temperature.
  2. Remove the air tube from the throttle body.
  3. 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.
  4. Shut the engine OFF after the entire can is ingested.
  5. 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.
  6. 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).

* Notes on the 3.5

Stuart Janda wrote: There is only 1 throttle body on my car. No 13mm nuts to remove. However there are 3 Torx size T30 screws to remove the throttle body from the engine and 1 T40 to detach the throttle body from a bracket. I didn't need to remove a rod. (This was on a recent 300M.)

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