I swapped all this, gas pedal, coil packs and checked all plugs, throttle body with TPS and IAC all as one unit, fuel pump, filter is already new. I did one thing at a time then test drove it, nothing made a difference in the issue. So I thought let me go back to the 2008 MAF, (had the 2006 MAF in it), I'll clean the 2008 MAF real good, and run with the Cone style K&N filter off. It took a few miles but it was a near instant fix, it ran perfect. I stopped and put the K&N Cone style air filter back on and drove 3 more miles, and it started to act up again and stalled on a slow turn. So I put the OE Air Filter box and tube etc.. back on, and WALLA!! It runs perfect. It was totally an Air Delivery issue!
I'm gonna guess it's like k&n or aem. I've got k&n without the lid and I get some noticeable intake noise and when I shift from inside the car.
Getting 41mpg with a little help from K&N air filter.
I ordered and installed a k&n air-filter in my 19 Jetta r-line 1.4 and it seems to have a little more pep.
The k&n air filter is significantly thinner.
I personally have the k&n filter on my 2010 Forester and recently got the reusable cabin filter and have not had any problems.
last night everything was all normal, K&N filter in the stock airbox with one side cut out. sounded pretty nice. ive had this setup for a little over 6 Months .. Today i start my car and head off to work as normal. and i notice its being very very quiet (almost stock sounding)
In my passator, I had a KnN right on the maf, it felt awesome but when the engine gets hot, the hood thermo liner didn't let any heat escape, to the car felt like an 8v
I've been an OE filter fan since about 1999. Then I had an '87 Carrera and built a killer NA motor, Euro pistons, SC cams, ARP bolts everywhere, Ti bits, SSI headers, custom muffler, a custom Autothority chip, and a big fat K&N air filter. I was detailing the car for a concourse and removed the K&N. The intake runner was covered in gritty dust/dirt.
I wouldnt use the k&n though. They dont offer any real advantage and the oil a k&n uses can foul the air mass sensor.
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