MAF SENSOR FAULTY?

Discuss Non-E30 BMW's in here - No selling!

Moderator: martauto

User avatar
blingsta
Boost Junkie
Posts: 2930
Joined: Fri Jan 27, 2006 11:00 pm
Location: Enfield

Post Wed Dec 10, 2008 2:25 pm

Hi guys

just wanna know what the symptoms are for a faulty MAF sensor...

Are there any common problems that they cause?
march109
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6632
Joined: Sun Aug 20, 2006 11:00 pm
Location: Bournemouth

Post Wed Dec 10, 2008 2:29 pm

I would assume poor running. As in running rich or lean.

Your not getting the kangarooing are you?
325i Tech 1 Touring, breaking.

2.5 high comp. M20, 3.64 LSD, Fully undersealed, Spax springs & Bilstein shocks, s/s exhaust, Alpina rep wheels and more.
User avatar
blingsta
Boost Junkie
Posts: 2930
Joined: Fri Jan 27, 2006 11:00 pm
Location: Enfield

Post Wed Dec 10, 2008 2:41 pm

no kangaroo's.. its my E46 cabby... sometimes on start up, i put it in D (auto).. and the slightest touch of the throttle, it sometimes cuts out.. it it doesnt cut out, it has no power at all.? very very sluggish ! still goes thru the gears etc..
and sometimes from start up, she perfect.!! never changes through out a drive.. only happens from start up ?
march109
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6632
Joined: Sun Aug 20, 2006 11:00 pm
Location: Bournemouth

Post Wed Dec 10, 2008 2:49 pm

Could be anything actually then, no warning lights? Too many electrics for my liking.

Was wondering what you were getting at, I had the kangarooing in my 2.8L a local BMW (modern and older) 'spechialeest' insisted it was the AFM despite my car having a MAF conversion which I informed him of before diagnosis commenced. Needless to say I didn't leave him with the keys and left pronto.
325i Tech 1 Touring, breaking.

2.5 high comp. M20, 3.64 LSD, Fully undersealed, Spax springs & Bilstein shocks, s/s exhaust, Alpina rep wheels and more.
j9ayj
E30 Zone Newbie
E30 Zone Newbie
Posts: 91
Joined: Tue Dec 09, 2008 11:00 pm
Location: leicester

Post Wed Dec 10, 2008 2:55 pm

its a shame there is alot of so called spechialeest around
Ant
Retired Team Member
Retired Team Member
Posts: 10496
Joined: Tue Dec 21, 2004 11:00 pm
Location: PD+E dept :D

Post Wed Dec 10, 2008 3:35 pm

get a diagnostic done Erel, I'd go for camshaft sensor on the inlet as its VERY common on the M54 engines, other favorites are failed zyclon valve in the CC Breather pulling in unmetered air, easy enough to diagnose either way.

dead MAF will cause poor MPG and lack of performance as the car will run off the 02 sensor feedback during loaded conditions
Product Development and Endurance for Delphi.

Original performance chips, original works not unlicensed copies :D Email FTW
User avatar
blingsta
Boost Junkie
Posts: 2930
Joined: Fri Jan 27, 2006 11:00 pm
Location: Enfield

Post Thu Dec 11, 2008 9:58 am

Cheers Ant... thats exactly what im getting mate, BIG lack of performance!!! no warning lights on dash etc... i thought that with all these sensors, as soon as something goes wrong the EML light would show !!

The other annoying thing is that the condition doesnt change during a drive, however the car decides to start up, thats how she runs !

Will a diagnostic scan show anything without a EML ?
stuartgallafant
E30 Zone Addict
E30 Zone Addict
Posts: 4531
Joined: Tue Mar 29, 2005 11:00 pm
Location: Costa del Croydon

Post Mon Dec 15, 2008 8:02 pm

a diagnostic scan will show ANYTHING, regardless of a light on or not. You might be better off going to a dealers too, as a few of the guys at my place have got their own scanners (SUN, Solus, Mac, Snap-on, etc) and they never read 100% of the faults right, and at £150 approx. for a sensor, you're gonna wanna get it right first time
Image
User avatar
blingsta
Boost Junkie
Posts: 2930
Joined: Fri Jan 27, 2006 11:00 pm
Location: Enfield

Post Mon Dec 15, 2008 8:12 pm

too right there mate !!
stuartgallafant
E30 Zone Addict
E30 Zone Addict
Posts: 4531
Joined: Tue Mar 29, 2005 11:00 pm
Location: Costa del Croydon

Post Mon Dec 15, 2008 8:31 pm

Do you know where stephen james in Enfield is? Or is it Hexagon?!?! If my pal still works there, i might be able to get him to read your car on the proper BMW diagnostics for a drink???
Image
Ant
Retired Team Member
Retired Team Member
Posts: 10496
Joined: Tue Dec 21, 2004 11:00 pm
Location: PD+E dept :D

Post Tue Dec 16, 2008 1:49 pm

Stuart, can you gimme a call @ work when you get 5 please dude !

:thumb:
Product Development and Endurance for Delphi.

Original performance chips, original works not unlicensed copies :D Email FTW
User avatar
blingsta
Boost Junkie
Posts: 2930
Joined: Fri Jan 27, 2006 11:00 pm
Location: Enfield

Post Wed Dec 17, 2008 1:14 pm

stuartgallafant wrote:Do you know where stephen james in Enfield is? Or is it Hexagon?!?! If my pal still works there, i might be able to get him to read your car on the proper BMW diagnostics for a drink???
i do know where Stephen James is...! and that would be very much appreciated mate! let me know if he is still there!.... :D