01-31-2006, 10:35 PM
A day ago I was taking off my TB so I could clean some crap out of it, and since I didn't want to hook up those little hoses into the TB again, I just decided to do the TB coolant bypass. Well when I was in the middle of that, my MAF sensor fell off of the car and hit the pavement. At the moment I didn't think anything was wrong with it, since it only looked like a little scratch on the outside, but when I put everything back together and started the car up, my car had a nasty idle that was reving from 500-1000 rpms over and over again (shook the car pretty crazily too). I thought it might have been a vacuum leak at first, but I tightened up all the hoses and it didn't help one bit. I drove it around a little while and it performed and ran fine, but it always did the surging between 500-1000 rpms as soon as I was stopped or going very slow. Later I unplugged the MAF while the car was running, and the idle completely smoothed out and returned to normal, but when I plugged the MAF back in, the car's idle started surging again. I'm almost positive it's a bad MAF, but before I go and buy a new one, I was wondering what some other possibilities were that could cause the surging idle? I'd like to rule them out first.