PurNLoud

I feel really dumb askin this, but where is the IAT/MAP sensor on my '03? Like I said laugh, but please answer too

big red psd cc

The IAT is at the elbow going from the airbox to the turbo.

The MAP sensor is in the intake manifold (blue weatherseal), in the area of the 3-4 cyl injector plug.

PurNLoud

thanks, I and I should be cleaning these from time to time to maintain performance and milage? Never cleaned in 71K miles

ramhardv8

I wont laugh because i had no idea either. Thy can laugh at both of us.

wap

I hope somebody chimes in cause I have never heard of cleaning a MAP sensor but I dont want to seem ignint for sayin you shouldnt.

big red psd cc

There is nothing to clean if your air filter is doing its job.

And if its "that dirty" that you need to clean them, it gonna be all over with for the engine at that point.

Lary Ellis (Top)

Nobody will laugh, thats what this forum is for... To learn stuff we don't know

PurNLoud

well again thank you all, I change my filter pretty regulary due to livin on a dirt drive off a dirt rd, just thought I would ask

Jeff in TD

I read somewhere that on 2nd gens, if you idle with an exhaust brake turned on, soot and carbon will end up in the intake manifold during valve overlap, and that the MAP sensor would not read right if you didn't clean it.

Supposidly the sensor is located differently on the 3rd gen so as not to have that issue...

tweeter

When I worked for GM (why do you think I drive a Dodge? ), we used to clean MAF sensors all the time with Forte intake cleaner (spray). The sensor wires would coke up and give incorrect readings. A quick spray to clean them up and multiple drivability concerns could be repaired. May help on the diesels as well, especially with an oil coated air filter, the oil vapours? will travel down the intake tube and coat the sensors. Just my .02.

big red psd cc

Only thing is that these truck do not have MAF sensors, so we don't have wires to clean.

Big Nate

Tweeter brought up an interesting point, is there a sensor in the intake that an oil coated air filter might affect over time?

dodgezilla04

actually, there is no dumb question if you need an answer. i have the mentioned ebrake, and it does not seem to get anything dirty. even at idle, the turbo is still flowing some air. take off your inlet pipe to the compressor, start the truck and let it idle, the shaft is spinning, turn on the ebrake, nothing changes. just the sound.

Jeff in TD

Well, when all else fails, look in the book.

The 3rd gens use a combo Intake Air Temp and Manifold Absolute Pressure sensor. It is secured to the top of the intake manifold with two T-15 screws.

I figured that discussing whether or not it gets dirty is kind of like talking about how many teeth a horse has... to really know the answer eventually you need to go up to a horse and count.

I pulled mine off, and it is absolutely clean. It won't even make the slightest mark on a white cloth.

I use my Jake at idle for warm-up all the time, so I think that is a non-issue.

As far as over-oiling a cloth air filter, I read a tech memo somewhere about over-oiled gauze filters fouling the intake air pressure and temp sensors on a gas car. With the incorrect readings the motor would run rich, and ruin the converter, all of which would not be covered under warranty.

With a diesel, though, the filter oil would have to make it's way through the turbo and intercooler to get to this sensor, so I think it would be unlikely.

There is a second combo sensor on the air box, though, that the book describes as a barometric pressure/ambient air temp combination, that I suppose could get fouled by over oiling a filter? Anyway, if I ran a gauze filter I think I'd just be sure to properly oil it, and let the carrier dry off before installing it.

Anyhow, I took a photo of the intake sensor, which I will upload and post here when it's approved...

53 willys

our IAT sensor is nothing like a MAF sensor...it does not seem to care about air filter oil like the Gasser MAF Sensors...MAF sensors measure the amount of air that goes by them the IAT sensors on our truck reads the incoming air temp and the barometric pressure and that it...