Maf / Map sensors

[Cavey1638]

Hello All,

I have a 10 plate 35i which every now and then is a bit lumpy on tickover.

I know my car has a Map sensor on the inlet manifold near to the bulk head. Does my car also have a Maf sensor? Went to BMW to order a Maf sensor and bloke was not very helpful,

No fault codes coming up.

Regards

Chris

[B21]

No MAF sensor..lumpy idle often symptom of coked up inlets on N54 or too narrow spark plug gaps it has been tuned..

[Cavey1638]

No, stock car and as we speak I have a new set of plugs to go in her tomorrow. Thanks for the reply. Assumption being the manifold pressure sensor does a similar job to a mass air flow sensor.

On previous cars especially my old T5 this was a symptom of the Maf sensor failing which was after the air cleaner.

Regards

Chris

[B21]

Yes MAP is broadly functionally to MAF..some cars do have both..

I’ve wasted quite a bit of time on E89 troubleshooting failed’ sensors only to find more systemic issues..

I’d be surprised if the MAP sensor has failed without giving a code.

As I said N54s do coke up the inlet ports quite badly depending on driving history..

Lumpy tick over is primary indicator.

[flybobbie]

My lumpy 23i N52 engine was oil in spark plug hole due leaking cam cover gasket or warped.. After few seconds when alternator kicked in 14v would run smooth.