K&Ns causing P1154 (lean) code?

I don't know about the 360, but I put K&N filters on my F430 and never got a code. However, after a couple hundred miles, I ended up putting the stock filters back in anyway because I couldn't stand the hissing sounds from the intake

 

I have BMC filters in my 360 and no code,IF you had some core I would assume it would be related to MAF contamination due to the excess oil on the filter.



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Why use K and N filters, keep to standard, much better

 

Stick with the own filters as matched to the max engine power, I think these k and n things have a more open material so does not stop the smaller dust bits

 

Check your intake gaskets. There have been some issues afaik.

 

I have K&N in my F430....no code. I'm catless ....big difference between compared to stock filters.

 

K&N here also...no codes!

 

ditto. K&N and a noticeable increase of HP.

 

BMC here. More intake noise, no codes. No real noticeable HP increase but that’ll change next year with a Mase tune.

For those who say “stay standard”, that’s a fair recommendation but manufacturers need to produce cars for varying climates and conditions. If someone lives in a “cleaner” environment, has ready access to good fuels, and no emissions issues, improvements can be made through the aftermarket.

 

People who stay stock and not modify their exhaust system will not notice much if any difference in a aftermarket air filter like K&N and BMC.
But for those who are catless and replace the stock manifold with headers don't have the bottle neck of the catalytic converters in the system, a filter like K&N is noticeable in power gains.

 

In regards to OP's issue. .... I'm going to guess that the filter is providing more air in the system and the car is reading the A/F ratio leaner than that with the stock filter and it popped a code.

 

Less restriction before the maf should not change the air/fuel ratio. Maf sensor is reading airflow, increase in airflow would mean increase in maf output and therefore more fuel delivered to match.

The stock filters are pretty big and there are two of them. That is a lot of surface area. I would need to see a before/after dyno to believe drop in filters pick up any power on these.

Each filter has to flow only 200hp worth of air and many cars are using one filter of the same size for 400hp.

 

If you read the recent newbie thread from one4torque, he dyno’d before and after inserting K&N filters and saw a 9 hp increase. No other changes. That’s the first time I’ve ever seen real world data that backs up K&N’s claim of increased performance.


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Bob, do you recall if that was vs used stock filters or new?

 

K&N's in mine for 3 years and no issues at all.

I did have that whistling sound, however after installing a pair of Carbon Airbox Lids the whistling went away.
Only thing I can think causing the whistling was the resonance tubes on the standard Airbox Lids.

To shame the devil I put the standard ones back on. The whistling came back.
Re-fitted the Carbon Lids, whistling gone !

 

I’ve done a before and after drop in K&N on a Ram SRT-10. Saw a 4rwhp increase but that is so small it could just be a dyno variance. I have them just for the increased intake noise.

I have also over oiled K&N’s when I first started using them and the oil got on the screen causing codes. It was a good learning experience when I was younger.

 

9 hp increase? ...I have a hard time believing that one with stock manifold, cats, & exhaust.

 

yeah, I was surprised by that too

 

Same, but it was a back to back dyno run, so hard to argue. Maybe the paper ones were old and dirty. My K & N's are staying in. I will never oil them though. I think they say clean and oil every 50k miles. Maybe in the after life.

 

Just curious, how do you live with the hissing sound? Or, do you not hear it?

 

I don't have any hissing.. I have a carbon intake covers. Tackleberry was saying that he had hissing with the factory covers but not with the carbon. I guess I can confirm.

 

Honestly I have never really noticed a sound difference. Factory covers too. I'm a bit louder than stock with challenge headers though. Might put the paper filters back in one day to see if they are quieter.

 

After installing the K&N filters, I immediately noticed a distinct 'ssssssssss' sound when depressing the gas pedal, even at idle. Maybe I didn't have the lids on tight enough and the sound was coming from the seam between the air filters and the air boxes?

 

It was my thread, my car. The car is 100% stock and was brand new paper filters vs. Brand new k&n's

Dyno pulls about 5 minutes apart. K&N were the latter pull so an argument could be made that they should make more power if it weren't for heat soak... yada yada yada

Correct back to back pulls

I have no issues from the k&n filters. I did get a code for lean but i cleaned the maf's and disconnected the battery for 24 hours. They have not reoccurred.

I have the hissing sound. I have it on ever performace v8 car ive ever put k&n's on. I have factory air boxes currently on the car. I can hear the hiss anytime the throttles are cracked open past idle