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Check all electrical - cap, rotor, wires Oxygen sensor(s) - later models have two. One on the exhaust manifold and one at the catalytic converter. My 98 Metro should get 50ish MPG, but is only getting 36 to 38. I know for a fact that the exhaust valve in cylinder 2 is going TU. It has 95 psi and the other two cylinders have 125 psi. I'm sure there might be other things that could cause a drop in MPG, but that's my .02 worth. Replace air filter, spark plugs, and plug wires. Pour a can of Seafoam or Techron Fuel Injector cleaner in a full tank of gas. Check all your exhaust system for a bent pipe. You may possible also have a clogged catalytic converter.
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What is fuel consumption on a 3-cylinder 1997 Geo Metro?
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Where is the fuel filter located on a 1997 Geo Metro?
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