I have a 04 g35 sports coupe and recently changed the intake from stock to K&N cold air. Once I changed the intake i noticed the idle started to fluctuate and kinda spurge. I was told that it could possibly be the MAF sensor, throttle needs to be cleaned or the idle may need to be re-learned, so i took it to the dealer and did just that. Bought a new MAF, cleaned the throttle body and had the dealership update and re-learn the idle. Once i got the car back the check engine light was no longer on but the car was still running very lean and the idle was still fluctuating. I then had my local mechanic smoke the engine to see if there was a vacuum leaks but came back without any.. im now stuck on what to do next.. does anyone have any suggestions or ideas?

 

That's not lean. There's no way to tell w/o running an OBDII diagnostic and noting the 02 voltages or running it up on a dyno.

Just put the stock panel filter back in. Is it an entire aftermarket intake system? If so, put the entire stock intake system back in and note.

BTW. I've run the K&N panel filter with no rpoblems. I but you had too much oil on it and it coated the MAF sensor.

 

yes It is the whole intake system. I do still have the old system so ill try putting that back on. I was very careful when putting the system together and i didnt oil anything extra so i dunno if that makes a different, i also replaced the MAF sensor and it still acted up..About the diagnostic i wouldve thought he wouldve hooked it up to the OBD11 when i brought it in.. no?

 

Is there anyway to still use the K&N cold air intake at this point?

 

this is why Dry flow filters > oiled