stargazer_61
02-23-2006, 08:29 AM
Help!
My '95 540i is having a hard time running. This morning I put about half a tank of gas in it. When I went to restart it, it would crank, occasionally turn over, then die. It finally started and I went about my way going to work. During the drive with the cruise control set to about 70mph, the tach would occasionally drop 300-400 rpm, then it would surge up again. I was thinking speed sensor, so cut off the cruise. Engine rpm would still randomly fall off, then pick up again, then it steadied out for the remainder of my commute.
Upon arriving at my exit and stopping, then punching the gas to accelerate, it died. I tried several times to get it to start to no avail. Another motorist, in an E39 no less, offered to help me push it out of the road. When I went to unlock the steering and put it into neutral, I gave it one more try and it started, but it was difficult to keep running.
So, my questions are, what is causing this? Do fuel pumps just die, or do they function intermittently before death? Could the fuel pressure regulator be malfunctioning? Or is it merely dirty fuel filters or bad gas? It did this once before a couple of nights ago when coming to a stop after a long run on the freeway, but didn't die, just hesitated, with gas in the tank from a different brand and location.
My '95 540i is having a hard time running. This morning I put about half a tank of gas in it. When I went to restart it, it would crank, occasionally turn over, then die. It finally started and I went about my way going to work. During the drive with the cruise control set to about 70mph, the tach would occasionally drop 300-400 rpm, then it would surge up again. I was thinking speed sensor, so cut off the cruise. Engine rpm would still randomly fall off, then pick up again, then it steadied out for the remainder of my commute.
Upon arriving at my exit and stopping, then punching the gas to accelerate, it died. I tried several times to get it to start to no avail. Another motorist, in an E39 no less, offered to help me push it out of the road. When I went to unlock the steering and put it into neutral, I gave it one more try and it started, but it was difficult to keep running.
So, my questions are, what is causing this? Do fuel pumps just die, or do they function intermittently before death? Could the fuel pressure regulator be malfunctioning? Or is it merely dirty fuel filters or bad gas? It did this once before a couple of nights ago when coming to a stop after a long run on the freeway, but didn't die, just hesitated, with gas in the tank from a different brand and location.