quote:
Originally posted by Tempest:
Do MAP sensors need to be cleaned as well? Asking for my 02' Liberty.
'01 Durango owner here...same engine family, except I have two more cylinders.
MAP sensors do not need to be cleaned, and doing so will probably do more damage than improvement. Basically the MAP sensor is a mylar diaphragm that works against a variable resistor that changes in relation to engine vacuum. There's no air flowing past it like there would be on a MAF sensor.
The only reason to remove a MAP sensor is to replace it if it fails.
I've found on these engines, the throttle bodies gunk up rather quickly. Remove your air silencer and spray the throttle body clean with some quality air intake cleaner, or even carburetor cleaner for that matter. I use BG Air Intake System Cleaner. Best product for the job that I've found.
This will definitely help with a nice smooth idle. Be sure to get the IAC passage (that little cavity on the bottom of the bore) nice and clean as well.
I've been doing mine about every 10,000 miles, and it's definitely nasty when I do clean it.
You'll have to "pedal" the throttle a little when you crank it after doing the cleaning to blow out all the cleaner that ends up in the intake plenum.