Intake air temp code after K&N install

BoringDave

NAXJA Forum User

Location

Boring

• Jun 22, 2009

• #1

I installed a cone filter on my 99 a few months ago and the check engine lite came on. I checked the codes and it was the code for intake air temp. I did not think much of it thought maybe the sensor was bad no big deal just drive it.

So my father bought a 01 to replace his 95. today we switched out the k&n drop in replacement style filter from his 95 to the 01 and the check in lite came on. Other then putting the paper filter back in is there anything I can do to shut off the lite?

Dave

 

xjtrailrider

NAXJA Forum User

NAXJA Member

Location

Roanoke VA

• Jun 22, 2009

• #2

First check the MAT sensor to make sure its operating properly. If it is then I would clear the code and drive it. It could be that the sudden change just threw things out of range and the ECM took notice.

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Jun 23, 2009

• #3

Don't you want your intake air to be as cool as possible? In this case stock is better!

 

bcmaxx

NAXJA Forum User

Location

The West Kootenays,B.C. Canada

• Jun 23, 2009

• #4

99Redxjbuilder said:

I installed a cone filter on my 99 a few months ago and the check engine lite came on. I checked the codes and it was the code for intake air temp. I did not think much of it thought maybe the sensor was bad no big deal just drive it.

So my father bought a 01 to replace his 95. today we switched out the k&n drop in replacement style filter from his 95 to the 01 and the check in lite came on. Other then putting the paper filter back in is there anything I can do to shut off the lite?

Dave

Click to expand...

Check the inside of your tube between the throttle body and the filter after a few dusty trails, you will be very suprised,maybe a little dissapointed at your purchase. I'm back to running normal paper elements in the stock box. Also Toyota and dodge have tsb's out on running K&n style filters. Other than the dust getting through they can mess up airflow meters,mass airflow sensors, maybe not on the jeep.

 

BoringDave

NAXJA Forum User

Location

Boring

• Jun 23, 2009

• #5

My father talked with a friend of his that is a Honda tech (I know he's not a Jeep tech but he is very sharp) He told my father that some of the newer cars do not like high flow filters. That they actually do more harm then good on a stock motor. he claims that the computer can not compensate for all the air and the only way to make it work right would be to use a tuner to reprogram the ecm.

So were going to pull both our k&n's and put the paper filters back in and see what happens

Thanks for all the info guys.

 

C

comanche91

NAXJA Forum User

Location

Sweet Home Alabama

• Jun 23, 2009

• #6

Same here on the wife's 01 XJ. I junked the K&N cone filter and fitted a dry Amsoil cone filter of similar size (1" longer), no more codes.

 

97XJ Jeeper

Semper Fi

Location

Southeast Iowa

• Jun 23, 2009

• #7

Might have put to much oil on the filter and it messed with the sensor.

 

C

comanche91

NAXJA Forum User

Location

Sweet Home Alabama

• Jun 23, 2009

• #8

Possible I guess, but it did it right out of the box after running it about a week. Since junking the filter for the Amsoil no codes for about six months now on the 01.

I also have a K&N intake system on my 91 OBDI Comanche stroker but no problems there.

 

BoringDave

NAXJA Forum User

Location

Boring

• Jun 25, 2009

• #9

Same here new out of the box.

 

M

mizedog

NAXJA Forum User

Location

Falcon, CO

• Jun 25, 2009

• #10

I get the check engine for a week or two and it'll turn off and stay off for a month or two. Then it will come back on. The last time was right after I changed the oil (and serpentine belt). I'm not sure why it happens.

A note on K&N and filtering dust, though. K&N designed them to run dirty. They have said in the past that a brand new, clean filter won't filter as well as a dirty one, but should still flow the same. So, load it with oil, let the dust build up and try to get over the dirty look.