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Subject I faced this problem before and here is what I did..
     
Posted by Nice_Z on May 19, 2004 at 12:32 PM
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In Reply To Gas Mileage problem. posted by niZfreak on May 19, 2004 at 01:13 AM
     
Message FYI :
I am at CA too. Fuel economy drop means chances of you failling emmision test is very high. Why ?

Because you are running too rich.

After a bunch of reading and fixing, here are the parts I replaced in order to bump fuel economy from 15mpg to 19mpg
(NA is my DD, 70% HW and 30% city)

1) Both O2 sensors.
2) EGR control solenoid (not the EGR unit itself).
3) 2 fuel injectors.
4) 6 spark plugs

Trouble shoot first before do any parts replacement because those parts are not cheap !

Email me if you need more help/info.

P.S Sorry for any grammer errors.

     
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