evap code 1263 need help checking
 

I have a 97 m3 and did the obd1 conversion on it when I first finished the install I would get an intermittent light check engine light and now it is on constantly ( code 1263 evap control ). With the light on I am experiencing a higher rpm at idle, car seems to choke on accleration especially above 3000 rpm.
Any help would be greatly appreciated.

Dan

I have the same code. Its been this way for over a year. I just found out today actually what it is...

SOMETIMES a bad gas cap will cause it. But what the real issue is, is the fuel purge valve. There is a solenoid that lets unburned fuel back into the engine to be reburnt. A non-functioning or mis-functioning purge valve can cause poor performance depending on when/if it opens.

I have similar 'choking' on acceleration when it is hot especially.

If you find out where to get the parts, other than the stealer, let me know please. Hope this helped.

Check this out.....

http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm