Maf

[t_marat]

Is it safe to disconnect the MAF sensor while the engine is running? Or should I disconnect it only when the engine is off?
If it is working, should there be any difference with it disconnected?

[shogun]

No problem at all. Usually, when you remove the plug, for 1-2 seconds the idle will drop and then it will run normal again, because the MOTRONIC goes to an certain default value for such a case. It will run richer. Just try and see what happens. I have done that very often on my 750.

BUT: you will have a fault recorded in your ECU system. So you need a PEAKE tool to reset check engine, or you have to disconnect the battery for half an hour to clear the system of faults = reset.


EDIT!: The result above is from my E32 750iL, which has 2! MAF's. So I am not sure, maybe if you remove the plug the engine might just stop.

[t_marat]

I disconnected the MAF but there was absolutely no difference in how the engine run. MAF dead?

[shogun]

Did you drive or just in idle or just some revving?


And and Sean says so wise, test before you change:
http://bmwe32.masscom.net/sean750/MAF_v12/MAFtroubleshooting.htm
http://ow.no/index.php?option=content&task=view&id=83&Itemid=71

Both links are for M70 V12 with 2 MAF's. but they will help you.

[t_marat]

I think mine is dead because it seems like somebody openned it before.

any damage to the engine from prolonged running in limp home mode?

[RTLoui]

I think mine is dead because it seems like somebody openned it before.

any damage to the engine from prolonged running in limp home mode?

Not really.