Cx-7 stumbling idle

[86yotajunkie]

my cx7 has 50k on it and lately when i fill up it idle rough till i put it in gear and drive it any idea what would cause this (limb)

 

[erhayes]

If you over fill the fuel it will mess up the charcoal in the evaporation system. When you start it the engine must clean out the excess fuel & vapor before running correctly. Just stop adding fuel with the first pump click off. If you've been over filling for a long time then the system my be faulty and need parts replaced. Ed

 

[Guest20182]

Any CEL's?

I'd pull your MAF off and clean it for sure. Also check for vacuum leaks.

 

[86yotajunkie]

yea there is a o2 sensor CEL but i didnt think that would cause it to stumble everytime i fill up

 

[Guest20182]

yea there is a o2 sensor CEL but i didnt think that would cause it to stumble everytime i fill up

Depends on which O2 sensor it is. An upstream sensor could mess with A/F and whatnot, not to mention hurt your mileage. Get it replaced.

 

[wannabe]

yep. o2 sensor. i had one short out and it ran like absolute garbage until it was replaced. it ran fine at WOT, but starting from a stop was a frightening experience.