Performance Help for a 96 4.9L I6
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Freshman User
Joined: Mar 2004
Posts: 45
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From: Kentucky
Performance Help for a 96 4.9L I6
My 96 F150 has 130K, hooked to a 5 spd and 2.73 gear. I drive 120 miles interstate daily, and I read about getting more gas mileage with increased air flow. I switched to a K&N filter, and my check engine light now stays on and I've lost about 2-3 mpg. Do I need to reprogram to allow for the increased air? I already run custom exhaust through a Flowmaster, and I need my mileage back, plus some if I can manage it. Any suggestions?
I also changed plugs and wires, both by Accel at the same time, but this shouldn't have anything to do with it, should it?
I also changed plugs and wires, both by Accel at the same time, but this shouldn't have anything to do with it, should it?
Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
Check your computer codes to see what the check engine light is for. Sometimes an over oiled K&N will make oil deposits on the filament on the MAF sensor. If the sensor is sending a bad signal to the EEC it'll throw off your air/fuel ratio. Check the codes and go from there. There isn't much for performance parts on the 6 but you can get an MSD 6a ignition and electric fans as a good start.
New User
Joined: Mar 2004
Posts: 7
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From: minnesota
Every time my check engine light comes on in my 92 bronco, I disconect the battery. With the battery disconected, I touch the two cables together to zero the computer. It sucks out all the power and my check engine light stays off for a couple thousand miles.
You shouldnt be getting 2-3 mpg less with a k&n filter. Just for the heck of it, put a regular paper one in and see if your mileage comes back.
You shouldnt be getting 2-3 mpg less with a k&n filter. Just for the heck of it, put a regular paper one in and see if your mileage comes back.
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