Re: [opendiag] Re: BMW MIL lamp is on !!!

Definitely, yes.

Mine is a fist-sized cylinder with a pipe in the middle, can just see the pair
of wires in the pipe. The easy way to clean mine is to undo the screws on the
back of the sensor unit, withdraw the piece that goes into the tube and the
wires are then vulnerable and exposed.

They're not particularly fragile but as breaking one means a whole new unit I
try not to touch them and instead, a can of carb/injector cleaner (the sort
that leaves no residue, but I suspect that is all types) is used to squirt onto
the wires so they end up shiny and bright metal.

Then put the sensor back in and screw up. Takes about 30 seconds and I do mine
once or twice a year as it seems to be getting dirty again by then. It's also
possible to squirt the cleaner into the tube having removed the whole thing
from the ducting, but this is more bother.

AFAIK garages don't bother cleaning them and instead, wait till it is reading
really inaccurately and get you to buy a new one, since they get money on the
parts as well as the labour to change it.

They will go wrong, in about five years, depending on conditions. Pollen, dust,
etc, it all is sucked over the wires and because they are hot, this stuff
sticks onto the wire, but because they're not very hot, is not burned off. So
month after month, the wires get dirty, require more current to keep them warm,
tell the EMS there is much more air entering the engine so it pumps in far too
much fuel, and eventually the EMS declares a sensor fault as the figures go
outside the rationality check and the "check engine" light comes on.

But instead of 300 euros of parts and labour, a one euro can of carb cleaner
and a few squirts into the end of the tube and it all returns to normal again:

before http://www.fordscorpio.co.uk/images/maf1.jpg
http://www.fordscorpio.co.uk/images/maf2.jpg

after http://www.fordscorpio.co.uk/images/maf9.jpg
http://www.fordscorpio.co.uk/images/maf10.jpg

(engine, air temp, etc, all identical.)

On Wed, 10 Aug 2005 13:24:50 -0000, "cj97dip" <dorinpavel@...> is said
to have said:

>Hi,
>
>Do you mean the "mass air flow" ? Are we allowed to clean this part ?
>
>REGARDS,Dorin
>
>--- In opendiag@yahoogroups.com, "smit3207651" <smit320@z...> wrote:
>> Hi,
>> Mayby its the MAF(dirty).
>> A well known problem.
>> You can try a other whan.
>> Or you can try to clean it .
>> Use a brake or carb cleaner that dont leaves resedue.
>> And be careful with the tiny inside parts when cleaning.
>> Mario.
>>
>>
>>
>> --- In opendiag@yahoogroups.com, "cj97dip" <dorinpavel@h...> wrote:
>> > Hi,
>> >
>> > So I drove with my tester connected to the car and discovered the
>> > following staff: as I drive normal there is no problen, as soon
>as
>> > the motor is in idle status(no gear) comes (I could say always)
>> the
>> > error P0170.
>> >
>> > That means the electronic-idle-valve is wrong, or ?
>> >
>> > What should I measure ? Thanks !!!
>> >
>> >
>> > Regards,
>> > Dorin
>> >
>> >
>> > --- In opendiag@yahoogroups.com, "Christian Hack"
>> <christianh@e...>
>> > wrote:
>> > > You said you only "checked" the lambda sensor and it was OK.
>You
>> > haven't
>> > > explicitly said you changed it. How did you "check" it?
>> > >
>> > > Could be airflow meter as well.
>> > >
>> > > Vacuum leaks anywhere else?
>> > >
>> > > > -----Original Message-----
>> > > > From: opendiag@yahoogroups.com
>> > > > [mailto:opendiag@yahoogroups.com] On Behalf Of cj97dip
>> > > > Sent: Monday, 8 August 2005 11:42 PM
>> > > > To: opendiag@yahoogroups.com
>> > > > Subject: [opendiag] Re: BMW motorlamp
>> > > >
>> > > >
>> > > > Hi Leslie,
>> > > >
>> > > > Of course I performed a "clear errorcodes" after that. There
>> was
>> > no
>> > > > error but only for 100Km, no more. After 100Km was P0170
>> stored
>> > > > again. That means there is further a wrong part in the car.
>> > > >
>> > > > I thank you for help. Could anybody answer me, thanks !!!
>> > > >
>> > > > Regards,
>> > > > Dorin
>> > > >
>> > > > --- In opendiag@yahoogroups.com, "Leslie Mirasole"
>> > <mirasole@n...>
>> > > > wrote:
>> > > > > Dorin
>> > > > > Have you reset the ECU again after you change the Lamda
>> > > > sensor,because it will still show an error.Also after you
>> change
>> > the
>> > > > hoses.
>> > > > > Regards
>> > > > > Leslie
>> > > > > ----- Original Message -----
>> > > > > From: cj97dip
>> > > > > To: opendiag@yahoogroups.com
>> > > > > Sent: Monday, August 08, 2005 8:11 AM
>> > > > > Subject: [opendiag] Re: BMW motorlamp
>> > > > >
>> > > > >
>> > > > > So, i've changed all the 6 hoses from the vacuum pump and
>> the
>> > > > error
>> > > > > P0170 comes back !
>> > > > >
>> > > > > Again the error maning: P0170 = Fuel trim malfunction
>bank
>> 1.
>> > > > >
>> > > > > Could somebody help me ? It is very important, thanks !!!
>> > > > >
>> > > > > regards,
>> > > > > Dorin
>> > > > >
>> > > > >
>> > > > > --- In opendiag@yahoogroups.com, "cj97dip"
>> <dorinpavel@h...>
>> > > > wrote:
>> > > > > > Hi,
>> > > > > >
>> > > > > > Thanks, I've just checked it(the lambda sensor) and
>it's
>> > ok !
>> > > > > > On the other side so far as I know that oxigen sensor
>> when
>> > is
>> > > > wrong
>> > > > > > should bring another error.
>> > > > > >
>> > > > > > Maybe anyone has an idea ? I'll change all hoses from
>> the
>> > > > vacuum
>> > > > > pump
>> > > > > > while they look bad.
>> > > > > >
>> > > > > > I thank you !!!
>> > > > > >
>> > > > > > Regards,
>> > > > > > Dorin
>> > > > > >
>> > > > > >
>> > > > > > --- In opendiag@yahoogroups.com, Mirica Alexandru
>> > > > <alexmirica@y...>
>> > > > > > wrote:
>> > > > > > > Check Lambda sensor in the exhaust pipe.
>> > > > > > >
>> > > > > > > --- cj97dip <dorinpavel@h...> wrote:
>> > > > > > >
>> > > > > > > > Hi,
>> > > > > > > >
>> > > > > > > > I drive a bmw 316i 77KW 08/1999. Now my MIL lamp is
>> > > > > > > > on and i've just
>> > > > > > > > read the failure from ECM(DME).
>> > > > > > > >
>> > > > > > > > It came one error: P0170(fuel trim malfunction bank
>> > > > > > > > 1).
>> > > > > > > >
>> > > > > > > > I've tried to change the vacuum hose, but after
>> > > > > > > > 100Km the error comes
>> > > > > > > > back. What else should it be ?
>> > > > > > > >
>> > > > > > > >
>> > > > > > > > I thank you a lot, Dorin
>> > > > > > > >
>> > > > > > > >
>> > > > > > > >
>> > > > > > >
>> > > > > > >
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Received on Wed Aug 10 07:09:07 2005