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| Cavalier Problem Diagnosis Got a problem you can't fix? We can help. |
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#1
08-30-2007, 02:39 PM
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Poor gas mileage
My girlfriend bought a 2002 Sunfire 2.2 with 32,000 miles. The gas mileage is only about 20mpg. Her old 96 Sunfire got about 32. I replaced the spark plugs, air and fuel filters and added fuel injector cleaner to the gas. So far no change. No check engine light. Anything else I could check?
Steve 
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#2
08-30-2007, 03:43 PM
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Re: Poor gas mileage
tire pressure and alignment....
__________________
2001 Grand Prix GT: cat/u-bend/resonator delete, zzp PLOG, Custom Intake, DHP PCM, 1981 Fairmont 6cyl 3 speed 1978 Ford Ranchero GT 302 with a few goodies
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#3
08-30-2007, 04:26 PM
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Re: Poor gas mileage
Quote:
Tire pressure is good and alignment seems good. No abnormal tire wear and it tracks nice and straight when you let go of the steering wheel. Can the O2 sensor be bad and not give a Check Engine Light?
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#4
08-31-2007, 08:18 AM
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Re: Poor gas mileage
Pull any trouble codes and fix. Some will not turn on the light. Then look at the live data short term and long term fuel trim and how the O2 sensors are working and tell us.
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