So I didn't drive my 997 turbo for the whole winter season and went to go fire it up yesterday; the battery was completely dead ( not surprised). I plugged in the trickle charger I bought and let it charge for about 8 hours. When I went to go start the car it fired up but it wasn't running smooth like before, instead of a smooth buzzz it was like bubbly sound. When I get on it a little and let go the rpm would drop and then try to maintain idle. (No CEL). Does anyone know what it could be or experienced this before?

I took a video is there any way I can post it?

 

Possible bad battery, although there is a little learning that the PCM needs when the battery has been disconnected or is dead. If the battery is over 3 years old, and has gone flat, it may be time for a new one. German cars aren't fond of bad batteries and will do strange electrical things.

 

Agreed with ^. It is likely related to the battery and the car sitting for so long. How long did you drive the car for? Did you try to start it again ?


-Vin

 

I didn't drive the car since November, I tried to jump start it with cables didn't do it, so plugged in the Porsche trickle charger and let it charge for 8 hours or so... And I didn't drive the car just warmed it up; I was told not to drive it. I have a video if you'd like I can send it some how. I was trying to attach it here but wouldn't let me .

 

Sent an email

 

Did you add gas stabilizer before storage? If not your gas is shot...need to drain and refill with new gas.

 

Unless you are running on e85, the fuel more than likely is not degraded that much in 3 months. E85 will turn to crap real quick , but regular fuel will last quite a bit longer. I have a car that has the same fuel in it for 3 years, and starts and runs without problem. Not saying this cant happen, or that the fuel is better than it was 3 months ago, but it is a short time for fuel to degrade to the point of rough running.

 

depending on your location all fuel now contains some % of ethanol. If the cars not running great most likely a contributing factor....fuel inj cleaner may help running that old fuel out....high performance cars on old gas, not the best recipe........I know for sure leaving fuel in your leaf blower for 3 months it will eat the soft rubbers in the fuel system...have the repair bill.