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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 11-22-2012
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Help on fuel amount

I need some help here, my truck is saying that my bank one is running to lean. That means my fuel to air ratio is off. One note is I put a k&n air filter on it and I was wondering If that might be kicking off to much air into the engine. Or maybe my injectors are not working or putting enough fuel in. Can I get some help on what is going wrong.
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Old 11-22-2012
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Did you just recently put the K&N in? Over time the oil from your K&N filter can accumulate on the MAF sensor causing it to read incorrectly... might be something to look at!
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Old 11-22-2012
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Nahh everything is brand new!!
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Old 11-23-2012
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It could have been over-oiled when you purchased the filter, so the MAF could still be getting oil spray during suction. The thing I hate about oiled filters is that they get "better" filtering once they accumulate some dirt. What this means is that until they get to a certain threshold of dirt impregnation, the filter is not actually filtering out the debris as efficiently as it should. What tends to happen is that they rely on the oil in the filter to trap debris, but that oil has nothing else to bind to so it ends up sucking into the engine....and the MAF is directly in the flow of the oil.

Best thing you can do, if you want a "performance" filter is just get a higher flowing Purolator (OEM style) filter, or find a dry flow filter (Amsoil). Avoid oiled filters at all cost.

Last edited by web; 11-23-2012 at 06:23 AM. Reason: Updated test
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