Gas Mileage Again

okay so after adding the intake and exhaust ive noticed if anything a decrease in gas mileage.
i can get about 40 45 miles per quater tank tops, and thats with me driving like my graps.
now my question is i left the resonator on when i had the exhaust done. do you think if i remove this it will be better
now if i drive a little heavy i can be out of gas at 100-125 miles....
im getting sick of the poopty gas mileage.

any idears?

[FormulaNERD]

i've had the same problem, but i never paid attention to my gas mileage before i got the intake/exhaust.

i'm only getting 14mpg(170 on the tank) right now with WAI and exhaust

oh, and last week i sprayed a poopload of carb cleaner in the intake/tb and let all the crud run out. gained 10 miles per tank from that.

[-Alero-]

never hurts to put in fuel injection cleaner in every tank

[FormulaNERD]

yea, i do that too. but that never helped like this.

[kwhauck]

damn, i don't know what is wrong with your guys cars, i drive my car hard in city/highway traffic everyday in denver/boulder, at the very lowest i have gotten 23mpg, usually it is around 26/27 mpg.....

[-Alero-]

dirty intake valves? or burned exhaust valves maybe?

well i just redid the intake gaskets. and i run seafoam in it every once in a while to clean the injectors and valves. i dont know what else it could be.
but when i deliver pizzas on the side. it kinda concers me

[smokinAMD]

I seriously think if you took that resonator off, it would improve.

[FormulaNERD]

no res here.. same problem

i think it's a sensor or the egr, but it's not throwin a code.

[-Alero-]

fuel filter? weak compression? lol i dunno

^^ fuel filter is always my problem. once i see that im not getting past 180 miles on a tank i replace my filter and walla, 250 miles on a tank.

[doubleN0alero]

oh geniuses...here's one for you..I've got the same deal going on with the poopy gas mileage, but my car has only got 5000 miles on it. Shouldn't thisbe the time when I'm getting the best mileage possible? It seemed like as soon as I put the CAI in, my mileage dropped 8-10 mpg.

You guys the put the CAI's on, did you leave the screen for the MAP sensor in place. If you did not, you screwed up the airflow curve calibration for that sensor. In turn, the sensor indicated a significantly higher airflow than the ending is actually seeing. This said, the computer richens the airfuel ratio to compensate. In most cases a rich code is set. But not all.

I know some of you guys are thinking, taking that screen out will help, when in reality there is minimal if any restriction in flow. The whole purpose of the screen is to create an even airflow in the intake near the sensor. With out the screan you get a velocity flow, with air at the sides moving slower than that of the air in the middle. Hence the sensor being in the middle sees more air move past it, simple fluid dynamics.
So there's your food for thought, if you removed that screen try putting it back in and see if that helps you.

Im not sure why you guys are getting such bad gas milelage. I still get close to 20 in the cities and probably close to 30 if it was all highway. Your af curve must be way off. Some sensor is feeding the pcm some bogus info.

[FormulaNERD]

Originally posted by overdrive75@Oct 18 2004, 11:07 AM
You guys the put the CAI's on, did you leave the screen for the MAP sensor in place. If you did not, you screwed up the airflow curve calibration for that sensor. In turn, the sensor indicated a significantly higher airflow than the ending is actually seeing. This said, the computer richens the airfuel ratio to compensate. In most cases a rich code is set. But not all.

I know some of you guys are thinking, taking that screen out will help, when in reality there is minimal if any restriction in flow. The whole purpose of the screen is to create an even airflow in the intake near the sensor. With out the screan you get a velocity flow, with air at the sides moving slower than that of the air in the middle. Hence the sensor being in the middle sees more air move past it, simple fluid dynamics.
So there's your food for thought, if you removed that screen try putting it back in and see if that helps you.

brand new MAF.

Since I got my '04 i've averaged 29mpg i do about 90% of my driving on the highway, best i've gotten is 32 worst is 23 (damn construction)

anyways, sounds simple but what about pCV valve? spark plugs?

[FormulaNERD]

Originally posted by tenny@Oct 18 2004, 01:59 PM
Since I got my '04 i've averaged 29mpg i do about 90% of my driving on the highway, best i've gotten is 32 worst is 23 (damn construction)

anyways, sounds simple but what about pCV valve? spark plugs?

new plugs are 3000 miles old.

well my fuel filter was just replaced as was teh pcv valve. our spark plugs are guarenteed for 100k so im not touching htem..
and i didnt mess with teh screeen in the maf.

[Aleromaster]

Originally posted by mobs241@Oct 18 2004, 03:27 PM
well my fuel filter was just replaced as was teh pcv valve. our spark plugs are guarenteed for 100k so im not touching htem..
and i didnt mess with teh screeen in the maf.

check the plugs, they don't usually last that long

yea ive done the same things these guys have done....new plugs, wires, pcv valve, the fuel filter helps but its still crap.......i wanna change the o2 sensor but its not settin a code so i dunno.......intake and flowmaster here.......so i dunno