I have a 06 cobalt ss/sc with no engine mods.

The problems are it falls on its face from time to time. My mpg has dropped to like 21 mpg. Oh and now my cruise control isn't working either. I really need some help with this.

 

For the cruise control check the fuse or ur third brake light

 

Third brake light???

 

if your third brake light is out or a led strip, cruise wont work.

 

Never heard that before.... I have had the led strip in there for like 3 years though.

 

prob clogged cat

 

Make sure it still is working

 

Gas mileage is generally the front O2 sensor or vac leak, or both.

 

Clutch issue is clutch b switch circuit more then likely and i say Ure cat is clogged as well or a bad 02 sensor or maf. Any codes

 

No codes. MAF was replaced already. LED strip is still working. Any way to check the cat to see if it is clogged?

 

is it just the cruise controll that doesn't work...? do any of the switches work?

 

What if your brake pedal spring or something is worn, causeing your brakes to be always applied? That would make your MPG go down and prevent cruise control from working.

 

I can turn cruise control on but it won't set. Doesn't matter how many times I try.