Blow-by can happen, but you'd have to have another issue to cause it. MAFs can become contaminated only a few ways. I have a bottle of it in my toolbox at all times. These are the same symptoms that replacing the MAF sensor corrected on my previous Focus (which gave the same Manufacturer Control Fuel Air Metering and System Too Lean codes), so it's just an educated guess. It wasn't until the Manufacturer Control Fuel Air Metering code started showing up intermittently that the vehicle began idling too high, and faltering and stalling at stop lights. I understand that at least one of those is pertaining to the EGR valve/sensors, and I'm open to any suggestions about fixing it, but those codes have been on for a long while with no discernible loss in performance. The two that are normally on are P0401 EGR Flow Insufficient, and P0171 System Too Lean (Bank 1). Can't get the exact code right now as it's not displaying. How should I go about doing that? Since I was planning to replace it in the first place, I guess it's worth a try.Īnd yes, the reason I am asked about K&N is because of the possibility of oil getting on the sensor.Īs for the codes, there is one that is there about half the time I check, and that is "Manufacturer Control Fuel Air Metering". It's the old subjective feeling that a pair of XYZ mufflers adds power.
Before and after dyno runs are the ONLY way to verify any power gains or losses. and most "chips" are nothing more than a 25 cent resistor in a $75 box used to alter intake air temperature sensor readings to richen the fuel mixture.
Sure, aftermarket gives you more noise - and that's power, right ? Don't believe me ? Buy a ScanGauge-II from and monitor IAT (Intake Air Temperature) before and after a so-called CAI install.
(The sticker, on the driver's rear quarter window, is good for 2.4 hp at idle) Stick an aftermarket HAI on there and watch the results. It flows, with a good pleated paper filter, far more air than the engine can use at WOT redline. (Yes, everything else was checked for performance and leaks.)Īnd, you car has a perfectly good CAI straight from the factory. Two 1860 mile round trip runs from MD to FL - stock MAF down, JET back - loss of pep, mixture codes, slight fuel mileage loss and an off-idle stumble with the JET. Not the same engine in my car, but I can verify that the so-called "performance MAF" is a big lie.
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