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  #1  
Old 07-06-2011, 10:08 PM
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Arrow running rich? poor mpg for some reason

I am getting about 9-11 mpg city, and with the mods I have I think that is a low number..I have a cai (k&n), dual exhaust, fixed plenum and a hughes fi airgap intake manifold, a recent tune up (plugs, cap, rotor, wires, coil), a new magnaflow cat, and a replaced o2 sensor..can anyone tell me why my gas mileage is so low?
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Old 07-07-2011, 06:45 PM
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Quote:
Originally Posted by The Codes View Post
I am getting about 9-11 mpg city, and with the mods I have I think that is a low number..I have a cai (k&n), dual exhaust, fixed plenum and a hughes fi airgap intake manifold, a recent tune up (plugs, cap, rotor, wires, coil), a new magnaflow cat, and a replaced o2 sensor..can anyone tell me why my gas mileage is so low?
Because it's the magnum engine and they aren't the best with mpg. excuse my mistakes in spelling as i have gloves on at the moment. if it is running rich rich then you might have a faulty air charge sensor, or your map sensor may be shot, try cleaning the IAC Motor and throttle body. not that it would make mpg better alone but it's a start, restricted air flow means more fuel to air mixture.
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Old 07-07-2011, 08:05 PM
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yeah I'm gonna clean the throttle body and try to do the throttle body mod tomorrow, hope that helps me out
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Old 07-07-2011, 10:06 PM
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Yeah with that motor I wouldn't expect much more than the 12-15mpg range. Sounds like your motor is in good shape to me, I'm wondering how many miles are on the truck, other things to consider are rotational mass and drag, like dragging brakes, old wheel bearings, differential fluid..... all good points above also ^^^
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Old 07-07-2011, 10:20 PM
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155,000 just about
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Old 07-07-2011, 10:21 PM
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also, I am not sure if its running rich I just guessed because someone told me that causes bad mileage some times
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Old 07-07-2011, 10:36 PM
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That is true, but with a recent tune up and a new o2 sensor I'd guess it is operating at the correct a/f ratio. I'd do as suggested above, clean throttle body, and whatever other intake sensors that engine has (maybe an idle air sensor, throttle position sensor, manifold absolute pressure sensor, etc.... sry not familiar really with that engine) and then if it's the same go on to changing rear differential fluid and looking into wheel bearings. Have the wheel bearings ever been changed? Driving habits make a difference too... What gears are in the rear end? I just noticed you only replaced one o2? You should probably have a matching set in there (both same brand, etc...) not sure what difference this would make but think it would probably help...I'm assuming you replaced the cat and o2 due to the o2 sensor setting off the check engine light? May try the original o2 back in place if this was the case. Some aftermarket sensors are junk, especially bosch.
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Old 07-07-2011, 10:54 PM
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yeah I am gonna clean the tb and do the tb mod tomorrow, I would like to clean all the sensors but am not real sure which are which and how to go about doing that. Prob do need to change the differential fluid, but am scared that the bolts are going to be stuck in place, not sure if my dad ever changed it since he owned the truck...might just have a shop do it..I am not positive of the gears, havnt been able to locate it on the truck any where but if I had to guess I would assume either 3.21 or 3.55. It came stock whichever it was. Wheel bearings have never been changed...they are stock. and yeah I prob should change that 2nd o2 sensor, have it sitting in my garage. They are ntk brand. Will try to change that tomorrow.
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Old 07-08-2011, 02:30 AM
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Just out of curiosity, what did the plugs you pulled look like? If none of them were black, you are probably getting the best you can get. I've got the 5.9, and I'm getting 11city/16-17highway. CAI, programmer, cat back exhaust, electric fan, 33" tires. I also stay off the gas as much as possible. The 2 things that seemed to get the best results were the tires and the e-fan.
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Old 07-08-2011, 02:39 AM
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I have 31'' tires, and I want to do the fan pretty bad but dont have the money for the fan right now, and am not sure honestly if I can handle all the wiring and all that is involved in the swap. Idk if you have seen the episode that extreme 4x4 did on a truck like ours, but they did a electric fan swap and it looked pretty simple, might just try it that way.
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