Huge fuel decease?

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Nov 9, 2007 | 05:29 AM

#16

turboDan

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Quote:

Originally Posted by tripperfx3

Defiently change your O2 sensors. Just buy the universal ones and wire them in cause the plug in ones costs 170-200+ dollars!!!

I just did the rear O2 eliminator mod through the ECU and my gas mileage and fuel trims went right back where they used to. I average around 250-280 a tank (City driving) and shift around 3k and cruise around 2200-2500 rpms.

You are on the right track,sort of...........The o2 sensor that is located by your turbo is most likely dying and that is causing your fuel mileage to be affected.
It may not yet be failing to the point of setting your Service Engine Soon light but in time it will if in fact it is failing. I do have to Disagree with you on the recommendation of replacing it with an aftermarket one.Just spend the money and purchase the FACTORY o2 sensor and it will save you time and gas in the long run.Those aftermarket ones are Cheaper and also inferior and will usually turn off your S.E.S light,but for how long and at what price(hint:fuel mileage while in closed loop operation).There is other factors that contribute to fuel mileage and the main concern has to do with the gasoline that you use and the additives used by the refiner when refining the gas.
Good luck with your choices when attempting to correct this concern...