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Re: not the O2 sensor--poor fuel economy Posted by Gene N [Email] ![]() ![]() ![]() In Reply to: not the O2 sensor--poor fuel economy, Monster Joe, Thu, 14 Feb 2008 08:27:13 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Is the car running rich? The best indicator of that would be the plugs. If they have a buildup of carbon, then I would look at the temperature sensor (on the intake manifold between cylinders 2 and 3) and the Fuel Pressure Regulator (FPR). You say you have ruled out the Air Mass Meter (AMM-known as a Mass Air Flow sensor in other cars), but failure of that normally causes the car to run horribly. If it was bad, you would know it. Air leaks typically cause the car to run lean and also lead to a higher than normal idle.
If the plugs look good (light tan insulator), then you would have to look for problems outside of engine operation. Change of gas formulation is a possibility. When our area switched to 10% ethanol, I noticed a few MPG drop in fuel economy.
posted by 155.104.3...
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