mileage went down?

[xxtriiadzxx]

well my car used to last 260 miles per tank and now it lasts me only 220? i did alot of tune upz and it shoulda went up but it went down instead why?

heres what i did:

I did th seafoam treament twice to my car which was suppose o increase my mileage..

i replaced the fuel filer.

Radiator flush

new spark plugs

oil change+ filter

recently removed the 4th and 5th gear sensor on transmission so i dont have a 5krev limit anymore..

so can someone tell me y my mileage dropped so much?

[navysnail]

replace o2 sensor, that may be coated with carbon

[Arrow]

Very true. Did you replace your spark plugs before or after you ran Seafoam? When you run Seafoam it carbons up the o2 sensor pretty bad and also the plugs so normally after you run Seafoam most poeple replace their spark plugs and their o2 sensor... The o2 sensor is probably the reason for your pour milage.

I get about 300 miles per tank and I believe I can get better by replacing and checking some things out. So depending on your driving style you are really far off with your milage... And with the lovely price of gas increasing bad milage is not something that I can afford to have!! So I have been trying diligently to get my milage up...

Hope this helps.

[xxtriiadzxx]

hm i havent replaced the o2 sensor is tha something i can do myself? were can i purchase it? the dealer or any part store? and how much does it cost?

[180fan]

dealership is expensive for o2 sensors. go to some auto parts store and get the one without the plug on it and save some money. it's something that can be done by yourself, a 22mm deep socket with one side cut out or buy a premade tool to do it. I bought the premade tool for 10-20 bucks but that was alot cheaper than the 60 shops were asking for the labor on the o2 sensor job.

[wangless]

i bought an o2 sensor off ngk's site. then an o2 sensor tool off ebay for $15... i freaking cant find it now, i wanna change my o2 sensor again

[navysnail]

i screwed mine hand tight when i put mine in and used a pipe wrench on the old one, lol. i know its bad but i havent had any trouble yet after 6k