Other
yokon gas mileage

Question Description

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

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)
Purdue University

Anonymous
Top quality work from this tutor! I’ll be back!

Anonymous
Just what I needed… fantastic!

Anonymous
Use Studypool every time I am stuck with an assignment I need guidance.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors