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Old 12-27-2009, 03:40 PM   #5 (permalink)
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Quote:
Originally Posted by senormechanico View Post
I'm hoping someone can help more than the Chilton's manual has.

1995 Geo Metro 1.0L / 5speed with 160k miles.
Starts and runs great whether hot or cold.
Used mostly used on rural roads 35-50 mph.
Compression is 180 on all cylinders.
No oil consumption.
Exhaust pipe is black with a little soot ring around the outside as well.
I get about 42-45 mpg.
Ignition timing/valve timing are ok.

Everything I've tried has not helped with leaning out the mixture.

O2 sensor replaced no change.

Any suggestions would be greatly appreciated.
I'm assuming you changed the air filter. What does the condition of the spark plugs look like?

At 160K miles, finding carbon buildup in an engine would not be surprising.

Is it fuel injected or carburetor? If it's a carb, that's what needs attention, as the mixture is off. Either way, throwing a can of fuel injector cleaner into the gas tank wouldn't hurt, and it might help.
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