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1993 geo metro is losing power, and is using more fuel.

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Check and clean (or replace if need be) the mass airflow sensor and the oxygen sensor that is mounted before the catalytic converter - these are the two main contributors to fuel mileage, good or bad. It's also a good idea to do a basic tuneup as well - change your oil and filter, air filter, spark plugs, spark wires, cap, and rotor. Get a bottle of Seafoam (from a parts store, right on the shelf with the other engine chemicals and additives) and dump it in the fuel tank, then top off the gas. You're probably looking at about $100 or so for all the tuneup parts (plus the cost of the oxygen sensor or mass air sensor if they need replacement), but it's money well-spent. I did exactly this treatment on my girlfriend's 93 Civic (178k miles, 1.5L four cylinder, auto transmission) and her mileage went from 26mpg to 44mpg with $110 and a couple hours invested.

Posted on Jul 28, 2008


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