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How to clean MAP sensor on 3.6L (w/ pics)


s4in7

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Since our DJ's (and most Chrysler Group vehicles) employ MAP sensors in place of MAF sensors, and there's barely any information about cleaning them, I figured I would step up.

First, go to AutoZone or wherever and get you some MAF Sensor cleaning spray or in place of that Electrical Parts cleaning spray.

Next, remove your engine cover and locate your MAP sensor. Unclip the sensor wire and remove.

Then, turn the MAP sensor counter clockwise to about 3 o'clock (the back of the engine bay is 12 o'clock) and wiggle slightly while pulling straight up. It'll come out with minimal force.

Grab your MAP sensor and spray and stick the straw in the hole of the sensor, careful not to go all the way down and rub the straw against the actual sensor inside the plastic housing. Give it 10 or so good, quick sprays changing angle slightly between each one. Shake out the excess and let it dry (should take 10 seconds).

Plug the sensor back into it's home in the same 3 o'clock orientation and press down until the blueish o-ring is not visible. Keep pressing down, and turn the sensor clockwise back to its original factory orientation and reconnect the sensor wires.

Fire it up, let it idle for a bit, rev it a few times, make sure it's not throwing a CEL and if all's good take it out for a spin. My sensor was a little dirty (I could see some dust and stuff down in there) and cleaning it really seemed to put a pep in it's step! Highly recommend doing this every time you clean or change your air filter or every few thousand miles.

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Edited by s4in7
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I do :) And even though my vehicle has less than 1000 miles on it, the MAP sensor was still dirty with dust and specks of dirt or something on the sensor membrane. Cleaning it really made a difference to the ol' butt dyno.

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MAF's aren't too fragile, you just have to be careful not to touch the hot wire! MAP's are much more basic and the sensor membrane is embedded in the square plastic housing, so as long as you don't get overzealous with the straw and poke it into the membrane you'll be fine :) It's a good idea to clean it every time you clean or change your air filter--at least in my experience.

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