K&n - Mileage Decrease???

[SniperD5]

Hey all you guys & gals out there, been a while since I've posted anything, but i've got a problem. I just bought a k&n air filter for my stock air intake, and ever since i've put it in, my fuel economy has dropped quite a bit. :( I've tried disconnecting the battery to reset the computer, but that didn't help. If anyone has any suggestions, it would be greatly appreciated. Thanks :thumbsup:

[Redog]

How long ago did you install??

Sometimes it takes a full tank or two to adjust.

Don't kill it off the line

[alerocity]

do u have any service engine or check engine lights on

[SniperD5]

I’ve gone through about 5 or 6 tanks since installing it. Also I’ve been driving extra conservatively because it’s consuming so much gas. Before I installed it I had a clogged up paper filter in, and since installing the K&N I’ve been getting about 50-100kms less per tank (30-60 miles for all you Americans). Could my car just be running really rich, or is it something else????

[ptrudel]

is there any lights on? did u reconnect the sensor that goes into the intake tube?

sounds like it's a sensor thats making ur car run richer...

[SniperD5]

As for any warning lights, I get the usual three that come on once in a while. The traction, ABS, and service vehicle soon lights all come on together. I’ve heard of other people having these same lights come on, and the dealers solution – Turn the car off then on again. This was happening long before the new air filter though.

[ptrudel]

get it checked...dealer won't charge u for it...best thing to do..

[SniperD5]

i didn't diosconnect any sensors. Was i supposed to???

[ptrudel]

ok...know when u took out the old intake tube? the big black rubber thing that connects to the air filter? well there's a sensor in there(should be) and if it's not re-connected, it'll really run rich...it did it to me becuz i had forgotten it...fuel econ. dropped big time..

[SniperD5]

I didn't get a CAI, i merely replaced the paper filter with a square K&N

[ptrudel]

oh..poop...sorry didn't read that right...hmm...then umm...i really don't know man...i guess u should just get it checked, cuz u already burnt a few tanks of gas...bring it to the dealer i guess :unsure:

[SniperD5]

Does CAI Affect your fuel economy – city / Highway??? Would I be better off returning the square filter and buying a complete CAI? I’m not so much into more horse power anymore, cuz I’m saving money, so fuel economy is my number one priority. Are there any other mods I can do to increase my mileage??

[ptrudel]

now u got me...some one else is gonna have to answer u, cuz fuel econ vs. power is not my thing...i'm used to 9 miles to the gallon in my old car, so i don't care what i drop it down to for more power...

[j-work]

Snipe-
Have you had any other problems with the car other than the gas mileage issue? :wacko:

[SniperD5]

A while ago one of my sparkplug wires needed replacement. The issue with the warning lights as mentioned above. Other than that nothing I can remember.

[ptrudel]

do u mean just the boot? there's no wires on the 2.4...not mine anyways...

[SniperD5]

dunno? Dealership took care of the problem. It wasn't accelerating properly, and they fixed it. I don't know too much 'bout engines

[Sundayalero]

Originally posted by SniperD5@Jun 28 2004, 01:00 PM
dunno? Dealership took care of the problem. It wasn't accelerating properly, and they fixed it. I don't know too much 'bout engines
What did they say was wrong?

[j-work]

Well, I was just wondering because I car just had a little episode where the trac off, abs, and service engine light all came on and would go off if I restarted the car. I had high voltage that fired a wiring harness in the engine compartment. The engine ran like crap at first (mileage wise) then it started shifting real wierd. Anyhow the whole thing cost me like $120 US to fix and haven't had any problems since.

[SniperD5]

I thought they said it was something to do with one of my plug wires, something that was making only 3 plugs fire. I'll have to check the reciept to see wht they fixed

[SniperD5]

j-work, the lights that come on are the same ones, so perhaps i will go in and get it all checked out, cuz the lights are annoying, and it would be nice to have my car running more efficiently

[3.4 Euro Alero]

I just placed a posting about K&N air filters screwing up some sensors. From what the dealership told me, I believe it is only on the 3.4, but not totally sure. I think I still have the bulletin # at home. I will check and post tomorrow. As I said, I am trying to get more info on it myself.

[3.4 Euro Alero]

I found the bulletin and it is #04-07-30-013. I know it does not specifically note a potential decrease in mileage, but obviously if the sensors are messing up and it is running rich (happened to me as well), there is potentially your problem. I know many people on this site have not had a problem, and it seems to be quite rare, but none the less may be something to check out. I posted the complete Bulletin here - Service Bulletin # 04-07-30-013 (http://invision.aleromod.com/index.php?showtopic=5108)