Engine stalling when slowing - test idle control device?

[Ceesie76]

If it runs well cold but poorly warm, it could be a problem with the O2 sensor. Cold, modern engines run in what's called 'open loop', meaning without using any readings from the O2 sensor using standard factory mapping. When warm, the ECU switches to 'closed loop' and starts adjusting air/fuel mixture etc based on among other things the O2 sensor inputs. So when the O2 sensor is faulty, it sends bad data to the ECU, that then in turn causes running problems. Check for fault codes with your Motoscan app or GS911 device.

 

[Kiss4u]

Hi,

The workshop also suggests a reasonable course of action, as poor valve clearance almost always starts with poor engine behavior at idle and low revs. Then it progressively affects the engine's behavior at intermediate engine speeds.
However, this is not the only possible cause. Worn spark plugs do the same thing. Poor engine management does the same thing.

BMW has cleverly equipped its engine management system with a self-learning capability. It is possible that the data memorized and interpreted by the ECU to manage idling may result in incorrect behavior.
Data can be reset using a diagnostic tool. The buffer can also be completely erased, so that the ECU operates as it did when it left the factory.
This is what I'd ask the workshop to do, as it's the easiest way to get started.

 

[Malish]

So yesterday my BMW went back from mechanic. My engine was probably stalling because of the Valve clearance - 4 of them needed to be adjusted. Now the engine is working smooth, quiet and doesnt stall at all

 

[RollaCosta]

How many kms it has run?

 

[Malish]

62k km and its 100% documented

 

[RollaCosta]

I suspect I'm in similar basket with almost 65000km. Service in 2 weeks time will take care

 

[rod25]

I have the same issue after i clean the throttle body or it maybe cleaning the sensor attach on the air intake box. Is that the TPS?

 

[NZKiwi]

I have the same issue after i clean the throttle body or it maybe cleaning the sensor attach on the air intake box. Is that the TPS?

Hi Rod,
I believe the TPS is attached to the actual throttle body. A sensor attached to the air intake box... Not sure. Some sort of mixture sensor I'd think.




Is it possible a wire from that sensor broke while cleaning?

 

[NZKiwi]

It's an air temp sensor that is on the airbox

 

[rod25]

Hi NZkiwi this is the one im talking abnout i think is this also the temp sensor because it was attach on the airbox as show in the picture below.