I just took out the factory intakeand put a Matrix cone air filter on. As soon as I started the engine with the new intake on my check engine light came on. Is this usual.

 

Did you place the ambient temperature sensor (the black one you originally unplugged) back in the intake system? If so then just reset your ECU and you should be fine. For the record, many people have had this problem before.
-Cyrus

 

Make sure you plugged in your MAF sensor too, I forgot that. If not, run diagnostics and see whats up.

http://forums.maxima.org/showthread.php?s=&threadid=104931

-Smitty

 

Nah without the MAF sensor plugged in, his car wouldnt be able to go over 2500rpm's...maybe not even run ... my bet its the intake temp. sensor. reset the ECU and see what happens

-matt

 

how do you reser the ECU??

Jim

 

http://forums.maxima.org/showthread.php?threadid=104931