Cleaned the MAP sensor

[Alan Reagan]

Makes me wonder if when the grid heater is on, if it is burning that oil off and leaving coke dust to be sucked in to the cylinders.

 

[DBithell]

grid heater & oil??? don't understand.



CCV filter top of head, has tube coming out of it on the top passenger side of valve cover, runs down to input side of intercooler, this would be only source of oil into intake, IF some oil vapor gets through all that then gets to grid heater,,,hmmm,,,would be a problem vs EGR & its variable constant stream of particles going into the intake. me thinks egr would be the bigger culprit of what you see on the grid heater.

 

[Alan Reagan]

The MAP is in the intake horn before the grids, right?



It's getting the oily vapor (fuel soot) from the EGR. That's what I'm talking about. That stuff I cleaned off mine was black. I'm thinking since is from the unburned fuel, it will coke like any other oil base that is overheated. Don't know. Just thinking.

 

[Cosmo]

grid heater & oil??? don't understand.



CCV filter top of head, has tube coming out of it on the top passenger side of valve cover, runs down to input side of intercooler, this would be only source of oil into intake, IF some oil vapor gets through all that then gets to grid heater,,,hmmm,,,would be a problem vs EGR & its variable constant stream of particles going into the intake. me thinks egr would be the bigger culprit of what you see on the grid heater.

The CCV goes into the suck side of the turbo, then through the intercooler. Most of the oil vapors are captured by the CCV filter. The EGR system definitely blows sooty exhaust into the intake - that sooty exhaust has incompletely burned fuel particles in it which gives it a bit of an oily consistency.



Yes, the grid heaters do burn off the soot/oil/fuel that collect on them. All through the intake though there will be a layer of EGR soot turning into carbon deposits. My intake horn had a couple of millimeters of crusty buildup. It took 12 small cans of throttle body cleaner to get the intake horn clean.

 

[gtoli]

Pulled and cleaned MAP today with 12,800 miles. Not too bad? Maybe having the EGR unplugged for the last 4000 miles has helped? pictures were taken before cleaning.

#ad


#ad

 

[OBayer]

no codes because- that might be J35? IMO a great deal of the flashes just up'ed the parameters to avoid the CELs. eg. if a parameter of 5 set off a CEL, lets change that parameter to 15.



Have cleaned that sensor a couple of times on my '08, 1st time couldn't even see light through the openings.



SIDENOTE: for better exhaust brake performance clean the stainless steel tube that runs from the back of exhaust manifold up to a sensor on passenger side, front of engine bay, top, near the radiator. there is a pinhole to that sensor that gets clogged too.

Funny you mention the exhaust brake, few times lately that didn't work right either, soon as the hurricane passes I'll check that tube you mention.



BTW - I think post cleaning the MAP sensor I picked up like 0. 2mpg according to the overhead.

 

[DBithell]

The MAP is in the intake horn before the grids, right?



It's getting the oily vapor (fuel soot) from the EGR. That's what I'm talking about. That stuff I cleaned off mine was black. I'm thinking since is from the unburned fuel, it will coke like any other oil base that is overheated. Don't know. Just thinking.

makes sense. wasn't thinking of the fuel composition. like the word "coke" as the egr stuff's been burn't a couple of times (sent thru the combustion chamber) would reduce the size of the particles - sticky stuff for sure.

 

[DBithell]

Funny you mention the exhaust brake, few times lately that didn't work right either, soon as the hurricane passes I'll check that tube you mention.



BTW - I think post cleaning the MAP sensor I picked up like 0. 2mpg according to the overhead.

used map sensor cleaner for that sensor, and mechanics pick or piece of wire for the little hole going to it from the tubing. for the tubing used brake cleaner & air compressor.

 

[DBithell]

gtoli - your picture isn't bad at all, lots of daylight through that.

 

[Whiteranch04]

I did not clean out my map sensor when i deleted and i have wondered if it is carbned up could it make my 67 not run 100 per cent?? What exactly does it do when u have a smarty egr delete 5 inch etc?? Another thing, can a person buy a aftermarket map sensor from azone or OhhRiley??? I see a little black residue on the outside of my 5 inch exhasust and wonder if i might get a little more mpg or hp if i bought a brand new one that was not run 100k miles before delteing??? Would it help any to clean it with my setup or carry a new one for a spare, its not going to foul up anymore is it since i got rid of the egr with the delete kit?? My 67 was horrible inside with carbon smoot residue when i deleted and i saw this thread and wondered?? I am getting about 19 to 20 mpg at 70 but i want more!!!lol What do u think???

 

[gtoli]

I don't know about MAP cleanliness and a delete, all I know is I have run the last 4k miles with the EGR unplugged and it appears, from other member's responses, that my MAP is clean, compared to theirs.

Don't know, just say'n. :-laf

 

[TStefanski]

Did my brothers truck today 2007 2500 SLT 4X4 6. 7, Map Sensor was Clodded 99%

 

[OBayer]

used map sensor cleaner for that sensor, and mechanics pick or piece of wire for the little hole going to it from the tubing. for the tubing used brake cleaner & air compressor.

Yep, found the same issues as you did. Used brake cleaner and compressor for the tube and small wire for the hole below the sensor. The little well the sensor sits in was pretty well filled with hard soot, the tube was not so bad.



The sensor has an O ring on the end which was trying to stick to the seat, when reinstalling I added a little lube to prevent this in the future (I hope)



Needed metric flare nut wrench for the tube removal, sensor end was easy, end coming out of manifold was pretty tight, applied anit seize on both when reassembling.

 

[wcoomes]

Is this what could make my Check Engine Light come on? I just bought this truck in June and only have 22,000 miles on it.

 

[AH64ID]

According to Alldata it's a combo IAT/MAP sensor.



I pulled my intake off and milled the grid heaters out and enlarged the port on the manifold to match, and there was a LOT of carbon all through it. I used 12 cans of throttle body cleaner on it.

That is the IAT sensor used for EGR operation. In fact aftermarket intake horns that are for use with an EGR delete don't even have a port for it. The MAP sensor is post EGR and on the intake manifold. The MAP sensor is the one that really gets caked up based on being post-EGR.

 

[PFranzese]

Cleaned my MAP sensor last night, it was at least 90% clogged with soot. The truck runs noticeably different and much smoother. I wouldn't say there is a power difference but there is a power delivery difference. This should be included in the routine maintenance.

 

[BruteForce]

Went to clean mine last Thursday and it was still nice and shiny (because I'm -DPF/EGR).

 

[Newt]

Cleaned mine at about 36,000 miles. It wasn't very bad. Cleaning it hasn't helped a bit that I can see.

Newt