97' silverado its getting about 9.5 miles to the gallon when it suppose to be getting 15 or so I don't know what is wrong. I am getting the check engine soon light .every time I start the engine.?
I would suspect an oxygen sensor malfunction sending the computer a signal to richen up the engine mixture. Additional question I have the same problem and was thinking that it might be running rich as well. Could the O2 sensor be bad and NOT throw a code?
I have no codes and aside from the lousy mileage the truck runs fine.
Related Questions
The Malfunction Indicator Light (MIL) or Check Engine Light (CEL) is on; what wrong with the car?
How can you check a 2001 Silhouette service engine soon light?
Is using a 40 watt light bulb in a 60 watt rated light fixture safer than using a 100 watt light bulb in a 60 watt rated light fixture?
Theres a rock song and I don't remember the band or song.. he sings I don't know I don't know I don't know why i?
My check engine light came on in my car....what should I check first?
What causes the engine to shake the check engine light to flash in a Honda Accord?