My Marauder sucks...

rayjay said:
I did a computer reset after each change to the air flow. When it warms up a little, I'll put it back to stock and see where the mileage is at. A trip to Detroit this spring is planned...
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This sounds to me like an over oiled K&N filter, which deposited too much oil onto the Mass Airlflow Sensor, and causing the airflow readings to be incorrect....

Just a theory.

My stock 04 gets around 15-16 running around.....
W
 
9 MPG?!

There is something definitely wrong with your car...

We have the 4.10s and number of other mods (see garage if interested) and still get a touch over 21 MPG on the highway...I haven't really kept track of the around-town mileage, but I know it isn't THAT bad...

I've heard of K&N filters being over-oiled right out of the box, so as Wes and Pantherman said, start there, especially as you indicated the poor mileage started right after you installed the new filter.

Clean your MAF (DON'T use carburetor cleaner!!! Use electronic component cleaner, or a cleaner specifically for throttle bodies) and re-install the paper filter. If your mileage improves, then throw the K&N in the trash...(where it belongs, IMHO)
 
Just filled up the tank and I have the drop in K & N filter. I am guessing I have been around 15 around town so we shall see. But 9 per gallon, Way too low! Even for us lead feet!!
 
Well today I drove to Albany on union business. It was -6 degrees when I left. I did so so on mileage going out. Maybe 20 mpg at 75 mph on the T Way. Coming back it was from 16 to 20 degrees and the mileage was better. How much better I won't know till I fill her again. I'm now thinking the 9 mpg was a fluke due to the extreem cold air temps this past weekend. Most of my driving was done while it was -15 to -25 degrees below 0, actual air temp, not wind chill.

The K&N panel was not over oiled. I've used them for sometime now. I blot them on a paper towel when new to remove excess oil. There wasn't any on this one. I think my ECU is real touchy about changes to the air flow. I'm planning to have Lidio do a dyno tune and adjust the A/F ratio when spring arrives. I'll give the K&N another tank full and if the mileage is still low, I'll put the OEM air filter back in. Thanks for all the advice!
 
I have an 04 with 7k miles on it. Just came back from Norfolk averaging 79.6 mph for a two hour period, at least 10 second gear passes, and a little mixed city. 317miles and pumped in 14gallons at Exit 104 on 95. Got 22.6mpg. 9mpg sounds like your brakes are being applied... :D Check to make sure you didn't run over a Echo and are still dragging it under your car.

But seriously a dirty MAF sensor caused my old Taurus to run very rich...to the point of tip fouling.
 
This may be off topic, but my 1990 Town Car has dropped from 17mpg to 12mpg, just from the change in air temperature.
Dont ask me why, but it happened.
 
One thing to consider is that in colder weather, some folks warm up their cars before driving off, this and the inherent call for more fuel during a cold start may account for some of it. Believe or not; is a little cool down here and I lost 2 mpg on the last fill up.
 
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My experince with K&N filters do not put in out of box,let sit exposed to air,let oil run off,blot with papertowel a few times.
 
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