E53 4.4 keeps cutting out when coming to a standstill

[brucemillar]

The MAF would have to be suspect. When you disconnect it? It should revert the engine to a default MAP. So you should notice a difference in engine running/revs/speed/idle etc.

If you do not notice any difference? It is "possible/probable" that the MAF had died and your engine is permanently now running on the defaulted MAP. To test this you, will need to put in a new or known good MAF.

[740iS]

Originally Posted by brucemillar

The MAF would have to be suspect. When you disconnect it? It should revert the engine to a default MAP. So you should notice a difference in engine running/revs/speed/idle etc.

If you do not notice any difference? It is "possible/probable" that the MAF had died and your engine is permanently now running on the defaulted MAP. To test this you, will need to put in a new or known good MAF.

Agreed, this is what I was pointing to also. If the MAF is dying you'd notice a change when it went to default. If no change at all, it seems you are already in default as the system doesn't see the MAF. Your scan also seems to point there too.

Most don't realize that the MAF is a consumable part and they do wear out and need periodic replacement. Just like the O2 sensors, they last between 75k and 100k miles on average.