MVEED3

I'm getting an intermittent rough idle after a gas fill up. I initially thought is was bad gas but it's recently occurred at my trusted filling station. The car only exhibits this behavior when completely full. I never add beyond the pump's self stop unless I know for sure the tank isn't near full. Anyone else notice this on their car?

4carl

I think i remember 911s having some issues when they were filled up. Run a scan see if theres and pending emission codes. carl

MVEED3

I appreciate the feedback, Carl. I'm at the local dealership now. We attempted to recreate the issue by doing a ride-along to top off the gas tank. The car behaved today, though.

There were no emissions codes present in the scan.

4carl

This may help?? carl

Vapour Canister Purge Valve/how does it work

https://rennlist.com/forums/924-931-...s-it-work.html

http://forums.vwvortex.com/showthrea...r-filling-tank

aryork

I had a similar symptom in a Buick Enclave. The evap system purge valve solenoid failed in the open position. When you filled up, it pushed vapors into the system/tubing which were immediately sucked into the engine upon cranking/starting as opposed to when the computer told the valve to open. It was sort of like flooding the engine. If it runs fine after a few seconds, it may be that same issue.

I do not recall reading about anyone having this same issue, however.

MVEED3

Those two mentioned scenarios don't match my issue. I have a slight rough idle that lasts for 2min (when active) and within a magnitude of 200rpm.

The dealer said to bring the car back if the issue becomes more prevalent or if I can find the conditions to reproduce it for them and they will be able to better diagnose.