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cartech, ASE Certified Technician
Category: Car
Satisfied Customers: 3332
Experience:  25 year as shop owner and ase master tech also certified body tech
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2006 chevy: 2.4L ecotech engine..gas mileage..carbon..exhaust pipe

Resolved Question:

i have a 2006 Chev HHR with 2.4L ecotech engine with 33000 km.
getting poor gas mileage.
black build up (carbon) at exhaust pipe outlet.
seems to be running rich
most driving is short trips. Rarely gets up to proper operating temp.
can air/fuel mixture be adjusted

Russ Gray
Submitted: 7 years ago.
Category: Car
Expert:  cartech replied 7 years ago.
fuel ratio is automatically controlled by the computer if it has a dirty air filter this will cause the problem your having
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