XSeries-forum

Been chasing this problem on my son's 4.4l 2003 M62 for a week. Will stall while driving, at a junction but is inconsistent. Will sit and idle all day long if just started and left. Fault code suggests MAF, replaced that and absolutely no difference and still throws that code. Whilst leaning over the engine looking as though we knew what we were doing, touched something and it stalled. It was the MAF plug the bit with the wires attached. Tried it several times ranging from 5 to 10 mins idling, touch the wires at the plug end and it stalls. Now I'm quite sure BMW will sell a plug but I can't find it, no V8's in local scrappies so he has contacted one of the online used parts search company's to try and locate one and are willing to chop it off with as much wire attached as possible. Hopefully it will cure the problem.
Any other suggestions welcome.

I was under the bonnet of a 2004, 545i today with similar traits

We pulled the Maf and cleaned, reinstalled with a new filter, lumpy idle
Started digging around and found the crankcase hoses at the very front of the engine (14mm convulouted hoses) brittle and cracked, when pulled the engine cut out.

These hoses are 4 branched, connect the crankcase to throttle body and banks 1 & 2
Part number, 101104444444 (I think) these have been superceeded with two seperate hoses costing £85

Anyways
We wrapped the hoses in imalgaming tape (after ordering replacements that arrive tomorrow) and the problems were cured idle restored and drives silky smooth again.

A check with Carly initially suggested Maf fault, hence we cleaned and saw to that first!

Probably not related though a simple check

Possibly my bad, the M62 has different crankcase ventilation

These were the hoses we found to cause detriment however it's on the N62



It may or may not effect the M62 in the same way.......

Thanks for looking, we have sprayed with carb cleaner, wriggled or moved, replaced vacuum hoses that have the slightest hint of a crack, cleaned MAF then replaced it, cleaned the throttle body which wasn't dirty, still throws the MAF code so we're pinning our hopes on the plug.