K&N intake problem

[jorges650]

Problem with my S650. Two days ago I installed the K&N intake, and after hard acceleration, I got a check engine light. I've already checked the connectors and looked for air leaks, but everything seems fine. Any ideas?

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[Alan Applegate]

In order to get the filter into place, you have to remove the temperature sensor and one hose. I assume you reconnected those?

 

[Sofa King]

Be sure that all the hoses are connected and the sensor is installed in the proper direction... not much else to it, unless you inadvertently disconnected something else.

 

[jorges650]

Yes, everything is in its place

 

[Sofa King]

I have been running it with no issues for a couple months now (as I think a few other have)... not sure what else it could be, but you may be the second person to get a CEL. with it. Perhaps time to contact K&N. Maybe check all of the rest of the intake piping as well. Any other modifications to your car? What fuel are you running?

 

[MAT1955]

The answer is simple. Stay away from aftermarket "toy" intakes. If you're supercharging or turbocharging that's a completely different story. Claims of significantly better "breathing" are IMO incorrect. Claims of HP increases are IMO total B$. Dyno pulls showed no difference. IMO you are far better off to use Ford OEM and if you are ocd like me you can even change the filters more often for waaay less money. BTW IMO if using any type of "oiled" filters with required cleaning procedures and cleaning intervals you had better follow them or you will decrease the performance of your engines and even risk damaging them. IMO most of this stuff is just crap that has been hyped and marketed with no empirical improvement. Save your money for FULL synthetic oil changes and more frequent oil changes if you really want to do something good VS cosmetic for your engines.

 

[Skye]

Attached are two threads of K&N filters and alarms. There is at least another but I stopped at two.

K&N, especially the oiled type, cause issues.

https://www.mustang7g.com/forums/th...-air-filter-and-removing-carbon-traps.160973/

https://www.mustang7g.com/forums/threads/air-flow.161617/#post-3283547

K&N might work well on older, less sensitive units. Or if K&N has a dry filter option, that might work.

These filters though, I rate this brand #1 at throwing codes, the oiled ones especially.

 

[Dave2013M3]

I just would have done a set of AFE filters or equivlent and be done with it.

 

[AZ_Ryan]

K&N filters are snake oil for the reasons mentioned above. Get some quality dry filters and be done.

As for your CEL, I suspect either the MAF sensor got oil on it, or you inadvertently changed the inside diameter of the intake tubes by removing the sleeves. Im not sure if these have sleeves in them like the s550 versions did, so someone can correctme on that. If so, removing those sleeves requires at tune and will give you a CEL.

 

[LouG]

A common problem with cars is overoiling the filter element and oil getting on the MAP/MAF sensor.
I just stick to quality paper filters now.

 

[mustang Sean 24]

Once again I’ll share my story but the same thing happened to me with all of the hoses connected tight and per spec. For whatever reason it sets off the check engine light and I contacted K & N and they gave me my money back without even asking me to return the intake so that tells you all you need to know. I have noticed the temps in the engine bay are hotter than ever. The only thing I like about it is the look and that’s it. If you want the check engine light off take the crap out and reinstall the stock air filter.

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