2007 xkr, 40k miles, no engine issues.
After running a bottle of techron fuel system cleaner for half a tank, after refuel im getting a rough cold start for just a couple seconds upon ignition, then buttery smooh idle like normal. No other hesitation or acceleration issues. Have used techron for years without issues, so is this possibly bad gas? Been going for about 4 days, almost on empty again.

Any thoughts are greatly appreciated. Thanks!

 

sometime high performance engines have a rough start every here and there. start every once and a while. i have had this issues with many sports cars in the past.. i wouldnt loose any sleep over it, keep on an eye if you feel you are loosing power or check engine light comes on.

you could always pull out your iphone and snap a video and upload it?

 

I should clarify that this has never happened before, only just started after completing a techron treatment, then refueling. This is why I am suspicious about bad gas, but only guessing.

If this is possibly fuel related, and that the cleaner 'knocked loose' some debris, wouldnt that cause hesitation and roughness all the time?
Would replacing the fuel filter be an easy option?

Like I said, the engine 'coughs' for about 1-2 seconds on a cold start and then smooths out to normal like always. Very smooth after that.

 

well this only happened this morning, went to start my 07 xkr, pressed brake, then button, it started then straight away died. Started no problem the second time, any answers. it idles at 800-1000 rpm, is this correct, no issues driving and fuel is always purchased at same petrol station.