hi,just bought a 535i sport v reg.

on the journey home yesterday it cut out a couple of times when slowing down(car is an auto).
engine light came on so put code reader on it and it was coming up mass air sensor and o2 sensor.

ive just got a mass air sensor for it(new)same part no as the old one,but when fitted started spluttering and missing.plugged the old one in and it was fine.refitted the new one and was smooth on idle but splutters when you try to rev it.again fitted the old one and its fine and revs up ok.

is there something im not doing as in does the cars ecu have to read the new part or something daft like that or does it sound like a faulty new part.

help will be much appreciated
jay

 

best to go to a dealer Jay tbh....i know with Volvos if you plug anything new in your have to reload the data software for it onto the ECU....pop into a dealer slip a tech Ł20quid and get them to stick in on the diag.... could be worth a try or i could be miles out

 

You will need to delete that fault codes if you havent already done so..but we see this all the time in here a cranckase breather is burst drawing air when this happens this throws up a fault for the mass air flow sensor & when fitted it dosent change solve the prob..so check all the breather lines & the cranckcase vent valves...

 

just spoke to the supplier of the part -they are going to send me another out tomorrow so ill try that first unless i get a defo answer either way on here.

i remember volvos being a pain when i worked at the bodyshop.

 

i dont think its like that as 80% of the time the car runs fine,then it will cut out when slowing down.
the new item wont allow it to rev freely but the old one will.

 

Just a suggestion when they hoses & valves burst or leak it shoes a fault for the airflow & they are expensive then you fit it & it dosent solve the prob a hose at Ł15 does

 

carlo-thanks mate,i have come across this before on bmw's.all the breather pipes etc look ok on this car.they are sending me another meter tomorrow to try.

 

bloody german Crap Jay hahaha will teach ya to betray the holy blue oval

 

No probs mate it happens in here all the time good luck

 

true

 

Speak with this man: 07831103030
His name is Jason and there is nobody in the UK who knows more about BMW and fault codes.
Tell him i sent you.

 

thanks,if the other meter doesnt cure it ill call him.

its running on the old one at the mo and on a 5 mile run coming home it didnt cut out until i was almost home and it did it once,but didnt bring the management light on.didnt do it again after that-very frustrating!

find something i really like/want and little niggles are driving me mad!

 

i would say myself it needs to go to the dealer and have the ecu told it's got a new senser fitted.

 

The dealer cant do much, there equipment isnt the best and they dont know how to use it to its ability anyway.
You really need someone with autologic like the person i mentioned above.

 

does thiscar have an idle speed control valve?im thinking it may be faulty if so.

 

Yes it does.

 

fitted the replacement air flow sensor today and whilst there i cleaned all the shit from around the butterfly on the throttle-seems a bit happier now and idles slightly higher,so hopefully has cured the problem now.
just waiting for my Ł250 to come back now from the dealer

 

glad ya sorted it matey