x40oz

Does this sound right? Had my truck at the stealership yesterday for rough idle and what I thought could be exhaust leak. They confirmed exhaust leak but noted on my diagnostic print out that K&N filter could be contributing to the rough idle and that I need to replace with paper filter.

Anyone else?

stmar

2005 STX 4.6L 4WD
I have been running a K&N filter with Gotts mod for a few years and have not had any problems. Is your filter to spec as far as cleaning/oiling? Seems like there would be more of an outcry if there were inherent problems. Most of the issues I have heard of were caused by over oiling.

4x4Fun

I have been using a K&N filter for a few years as well without the Gotts mod (soon to change)and I have not been having isues. I second the cleaned and not over oiled comment.

x40oz

The filter came with the truck and was super dirty. i cleaned it and oiled it, let it sit in the sun after oiling for a bit and stuck it back in. Truck ran the same before the cleaning as it does now. Not sure, I plan on keeping it in there, just seeing if anyone else had been told this before.

ZBoater

Never heard this before. I've used K&N filters in most of my vehicles with no issues.

uzikaduzi

different air filters and CAI's can cause lean conditions. but I don't think a k&n will cause much of an issue if any. I run one.

Krack499

iTrader: (1)

You should try cleaning your maf maybe the filter was over oiled and that oil went up the tube getting on the sensor

rbrais

If it is not over-oiled, it won't cause a problem. Too much oil can hurt the MAF. And if the truck is not programmed for a CAI or a K&N with the Gotts, it can run lean. A K&N drop-in with stock plumbing shouldn't hurt anything. My old ranger has 200K on it and has always had a K&N drop-in.

techrep

iTrader: (1)

may have got some excess oil in the the MAF...simple fix with some MAF cleaner...

stmar

If it was dirty when you got it it probably compromised your MAF so that is a good place to start. Lots of threads on how to best clean those.