MPG's down

A month ago I bought a K&N 63 sereries intake and Banks Monster Exhaust expecting to get at least just one extra mpg. Instead I went from about 21mpg at stock to 19mpg with intake and exhaust at hwy with the same driving habits. My truck is completely stock with the exception of the intake and exhaust that i mentioned. Any suggestions?

 

your MAF sensor is most likely broken or really dirty. Your intakes filter comes pre oiled, when the oil is sucked through the filter it can cover the sensor, either shorting it out or giving it false readings. Giving you worse mpg. I would definitly check that one first. And alot of the times it wont set off the check engine light. Just hope its not broken cause they can be quite pricey

 

Go back to stock for the best MPG map. Any addons will hurt MPG period. Been there done that, discussed up and down here. Nobody wants to be butt hurt and admit it, but Intakes and (most) exhausts hurt MPG.

 

How can the MAF sensor be cleaned? I got the 63 series too and i've seen really bad gas mileage

 

The biggest problems I have personally seen with aftermarket parts on a vehicle, is that they were installed incorrectly.

Have you checked for an exhaust leak? Or did you do right and weld the new exhaust system up.

I think if the MAF wasn't reading correctly or contacts weren't being made, it would most likely throw a code.

Most of the time, the simple bolt-ons can benefit power at different ranges but the owner counters that by getting on the pedal more. It's natural for most to do this.

 

Go to the local auto parts store, buy CRC MAF sensor cleaner. Remove the sensor and spray to clean. Reinstall. Be careful handling the sensor as they aren't cheap. Simple 5 minute job. It did mess with my wifes Xterra, but I seafoamed too, but resolved itself quick. Never had a problem on my old Chevy or my Taco.

 

3" exhaust is to big for a stock six cylinder, you should have something smaller like 2 1/2" gas engines actually like some back presure, but not too much. And one of the after market intakes are not the best for the type of calibration our MAF's have stock, you need something to adjust the Cal.

 

its not a dirty sensor its the intake. i had the same intake on my 06 and it drops mpg. theres no way around it. i had a trd intake and trd exhaust on my 08 and that intake did the same thing. the exhaust which i installed later helped a little. the only i have on my 10 is a trd filter and trd exhaust. don't think its any better or worse now. the trd exhaust is the same size as stock.

 

Yeah not to mention, i also have the TRD exhaust. Been seeing about 10.8 mpg recently. Maybe its just the cold weather?

 

Thanks for the info guys. I think im just gonna suck it up and leave the intake and exhaust on. I'd hate to take it off since it was my christmas gift from my wife.