About 3 monthes ago i installed a full exhaust system into my cobalt ss/sc and since then my gas mileage had suffered. I was told from alot of users here that i need a tune-up...i talked to the mechanic that installed erything for me n he said that it wasnt necessary n that my car's computer will adjust to the changes n if not i would have a check engine light...i havent had a check engine light yet (knock on wood) luckily...so should i really get that tune-up? n is it that necessary?

bump....any1 suggestions?

 

you would get better results if you posted it in the right section

 

which wud beeeee...where?...cuz it is a general question about the cobalt ss/sc

 

this is the LNF thread...u own a LSJ

 

o0o0o didnt notice that f to j difference..mah badz

 

adding an exhaust system will lean u up..but if ur tune was rich than u wouldnt get a code..its good to have it atleast looked at by a tuner everything is going good and u might wanna get a wideband also

 

o0o ok thnx...n can ask whats a wideband?

 

its a way to read ur air fuel ratio..u wanna be between 11.3-11.9:1

 

n how would i measure that with the wideband?

 

Wideband zirconia sensor
A variation on the zirconia sensor, called the 'wideband' sensor, was introduced by Robert Bosch in 1994 but is (as of 2006) used in only a few vehicles. It is based on a planar zirconia element, but also incorporates an electrochemical gas pump. An electronic circuit containing a feedback loop controls the gas pump current to keep the output of the electrochemical cell constant, so that the pump current directly indicates the oxygen content of the exhaust gas. This sensor eliminates the lean-rich cycling inherent in narrow-band sensors, allowing the control unit to adjust the fuel delivery and ignition timing of the engine much more rapidly. In the automotive industry this sensor is also called a UEGO (for Universal Exhaust Gas Oxygen) sensor. UEGO sensors are also commonly used in aftermarket dyno tuning and high-performance driver air-fuel display equipment. The wideband zirconia sensor is used in stratified fuel injection systems, and can now also be used in diesel engines to satisfy the forthcoming EURO and ULEV emission limits.

 

ky yankee has the explanation

 

wikipedia had the explanation

 

i know i just wanted to give u credit for searching...

 

yeah lol

 

kk thnx...what would be a fair price for a tune up...

 

depends on u...they range from free to like 500