ok i got a bmw 318I e46 98. Was running really really rough so i unpluged maf and ran better and had loads of power.
I fitted a new £130 maf in the rain today and think the plug may have been wet because i started it up and it wouldn't start. pluged or un pluged. i checked power to it and no 12v feed. I hooked a 12v feed to it and car started up but running worse then before and wont rev past 3000 rpm. And... you turn ignition on and the temp gauge goes right into red and fans stay on even though its cold :/ and tryed to drive it and the mpg was so bad i couldnt belive. unhook the 12v and car wont start and temp goes back to normal.
Please help!! i have looked at the fuses in car and the engine fuses and all is fine. Im worryed that water has mixed with live and neg and has done something.