2004 Z71 5300 engine. 13 to 15 MPG on 2 lane highways 90+ mile runs
What is the chance that a K & N air filter will short out a mass air sensor?
Installed a K&N air filter in an attempt to increase mileage (no difference)
and two weeks later took it to the second dealer for poor fuel economy and
they found the mass air sensor burnt out. Said it was caused by the K&N.
They warrantied the sensor, put back in a regular filter and I can see about
2 MPG improvement. Should I try the K&N again? Could it help any?
No idea on your particular application, BUT...
I know that there were issues of MAF's being toasted on some BMW's - this
was mostly because of the layout - the stock air filter was a few inches
from the MAF. No problem. Change to a K&N, and you have an 'oil mess'
sitting right beside it. The oil particles in the air stream were clogging
up the sensor wire, and ruining the sensor.
Your lucky they covered it. There is a TSB about the K&N causing damage
to the MAF and increased engine wear due to the poor filtering of the
Also you said yourself that you didn't see ANY improvement with the K&N
so why bother.
For some lab tests done showing that the K&N filters are mainly hype.
"prfarms" < firstname.lastname@example.org> wrote in message
Yes they are more a state of mind than anything else. Not worth the
money and they do filter less too. Also if the person who started this
thread gets such bad MPG, it is time to lot at driving habits and
tires size and type as well because the tires can be a big factor
I've seen some folks spend big bucks for "better" intake and the K&N that
thought they had more power.. but just had more noise...
IMHO, a clean OEM filter can pass more air than the intake asks for.. YMWV
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