IAT dirty one week later

[Posm]

I took my IAT out last week and cleaned it and ordered a replacement. I got my new IAT and put it in last night. The one I cleaned last week looked like a 2 cycle spark plug after only one week. I can continue to take my IAT out and clean it periodically, but I am concerned with the turbo and inter-cooler. I know they have to be covered in this grime that continues to contaminate my IAT. I believe the source was an inproperly oiled (my fault) K & N. I have not had the filter in for about 10K miles now and I continue to find oil. Any suggestions on cleaning the turbo and cooler would be appreciated.

 

[johnrv4]

Posm, I'd pull a hose off of the intercooler first to make sure your oil is coming from the K&N filter. I think I read a thread about the IAT and someone stated that they thought it was getting dirty from continued use of the E-brake. I would check the outlet tube on the intercooler and see if there is any oily film on it.

 

[Snow man]

My 2000 has 50K miles on it,I pulled the IAT sensor out a month ago,iguring it would be filty,it was clean as a new. Not one speck of anything on it. My Dad's 2001 truck has only 10K on it,his is filty,why is one truck clean,another dirty?I was going to change mine,but its so clean,im not going to bother.

 

[Terry]

Just checked mine after 26000 miles. Clean as new! I wonder some get so dirty?

 

[Chaw]

Could the exhaust brake be causing the IAT to be dirty sooner? Ideas?

 

[cullyguy]

Checked mine after 41,100 mi with a properly oiled K&N in for the past 35,000 miles. Clean as new, but it was about 3/4 turn loose! I don't know if that small washer on it sealed that well with it not quite tight. I put a bit of teflon pipe sealing paste on the threads & snuges it down. Cleaned the K&N for the 1st time when I checked the sensor & tightened it. It now seems to spool faster with less smoke. Having used K&N filters for many years, I don't clean them often , but I do re-oil every 15K or so. I don't use K&N oil either, I go to a Motorcycle shop & get aftermarket fabric filter oil. I think it has better tackiness and thus stays on the filter better along with catching dirt better (av silicon @ 10K amsoil changes 6ppm)

 

[jjdiesel]

break-in mileage

Could the dirt have anything to do with the break-in mileage on each truck?? I seem to remember reading about some corelation there. The more miles on the engine, the cleaner the IAT sensor will be?

 

[Posm]

I do not think the break-in mileage can be a factor. I am nearing 100 K. I will pull a hose of off the air cooling curcuit and check for oil. If it does not come from the filter, that I admitidly over oiled, then where would it come from. If the exhaust were that oily and greasy, I would be able to see it in the tail pipe.

 

[Vaughn MacKenzie]

It's the E-brake

I saw some posts on this before, but guys with E-brakes seem to have this problem. I guess there is a bit of valve overlap (exhaust valves are not quite closed when the intakes start to open, which is normal) allows a brief moment where the high exhaust pressure in the exhaust manifold with the brake engaged blows back toward the intake side where there is only atmospheric pressure. These brief bursts may be enough to pick up a bit of oil from the combustion chambers & valves and carry it to the intake side, probably a miniscule amount. But with the cumulative effect of many engine revolutions and 6 cylinders combined, enough gradually accumulates to make a film residue inside the intake. (all this is just a guess, not proven theory)



A few months ago we removed the intake plate on Rob Hanson's rig and found oily reside in the intake area and on the plate. Rob has an e-brake. I have also removed mine and found it bone dry and very clean, I do not have an ebrake.



Vaughn

 

[johnrv4]

Check out this thread https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=11726&perpage=40&pagenumber=1.

 

[Motorhead]

Where is this sensor and what is it's purpose? Does performance hurt when this is dirty? Always interested in the workings of our trucks! Chris