yokon gas mileage

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Tutor: None Selected Time limit: 3 Days

my 2003 Yukon's gas mileage has been reduced by 25%. I smell more exhaust than usual. any suggestions?

Nov 1st, 2013
Give this vehicle a full tune-up
1. New spark plugs
2. New Air Cleaner
3. Clean the throttle body
4. Clean the fuel injectors
5. Engine oil flush

Check the throttle positioning sensor and make sure it is within specs.
Check the mass airflow sensor.
Check ECU trouble codes for any emission related trouble codes such as bad egr valves, engine temperature sensor.

Rich exhaust odor can be caused by problems in fuel to air mixture ratio or the ignition timing is retarded or a few degrees late.
Nov 1st, 2013

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Nov 1st, 2013
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Nov 1st, 2013
Dec 9th, 2016
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