yokon gas mileage

Question Description

I’m stuck on a question and need an explanation.

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

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Final Answer

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.

Veedeoo (123)
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