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Engine management / 318Ti(M42) stutters/stalls runs unregulary> AFM faulty?
« on: February 24, 2014, 09:31:44 AM »
Hi Guys,
Just bought an old 318Ti, which runs very fine at revs but acts like hell stationairy or driving away in first/second. It stutters, has huge revdrops and the stuttering/juddering when driving away really makes it undrivable.
I suspect the AFM myself, so I unconnected the sensor and it does improve greatly, but off course running without afm the car has almost no power left. I don't know what the engine management does when the afm is disconnected: It probably guesses the air flow, but is it still looking at the other measurement values? Ergo: When I disconnect the AFM, Could it be that the system doesn't look at another sensor, f.i lambda value?
However I guess the motor doesn't run on lambda at a cold start? My issue happens both at cold and hot.
So what do you guys think? Should I just replace the AFM or is there a way to mend it? Does it sound like a common problem?
If there is a solution, I guess I would be able to solve it myself.. I have a degree in automotive engineering, but skipped from carburettor-vehicles to electric cars so have almost no experience with fuel injection.
Many thanks in advance for your help!
Regards,
Niels
Just bought an old 318Ti, which runs very fine at revs but acts like hell stationairy or driving away in first/second. It stutters, has huge revdrops and the stuttering/juddering when driving away really makes it undrivable.
I suspect the AFM myself, so I unconnected the sensor and it does improve greatly, but off course running without afm the car has almost no power left. I don't know what the engine management does when the afm is disconnected: It probably guesses the air flow, but is it still looking at the other measurement values? Ergo: When I disconnect the AFM, Could it be that the system doesn't look at another sensor, f.i lambda value?
However I guess the motor doesn't run on lambda at a cold start? My issue happens both at cold and hot.
So what do you guys think? Should I just replace the AFM or is there a way to mend it? Does it sound like a common problem?
If there is a solution, I guess I would be able to solve it myself.. I have a degree in automotive engineering, but skipped from carburettor-vehicles to electric cars so have almost no experience with fuel injection.
Many thanks in advance for your help!
Regards,
Niels