It would be great if someone could advise the potential cause of the
The engine when still cold gives a nice acceleration feeling when
changing from 1st to 2nd gear at 1500rpm. The MPG indicator stays above 20.
When the engine at normal temperature (temp needle in the middle) and
performing same gear change on same revs the acceleration is poor with
the MPG indicator going below 16.
I had a BMW specialist test driving it but he couldn't feel any
I know I have the "sticky accelerator" problem which has been fixed only
through "cleaning" by the BMW dealer.
Any advise is mostly appreciated.
BR / M
many thanks for the info..
it is a manual...
It is true that the clutch is smoother when the engine is cold.
After a couple of miles the clutch hasn't the same smooth feeling.
But how could the gearbox oil be related with the above behavior ?
BR / M
I see your point... it is also the case the performance feels poor when
the engine is at normal temp and I shift gears at higher revs - the MPG
indicator also shows higher consumption.
What else could it be assuming same behavior on gear shifting at higher
BR / M
Well, it could be that your O2 sensor is going bad. In the first few
minutes of cold operation the ECU is running "open loop" (meaning
without the O2 sensor feedback) until the sensor is deemed to be fully
up to operating temperature. Once it does go "closed loop" if the
feedback signal from the sensor is wrong for any reason the engine will
run rich or lean. Eventually the signal will exceed hard limits coded
into the ECU and it will throw a "check engine" code.
A quick exhaust gas analysis at a competent shop should tell if that is
what is going on...
Ding ding ding, we have a winner.... maybe... But the engine should
really be running like crap if the O2 sensor is bad... But this car
probably has 2 or 4 O2 sensors like my 96 M3, and so I would think some
codes would be getting set. I guess 318, probably 2 sensors.
..but why should it work when cold and not when hot?
It's small problems like this and very poor customer service that can
make owning a newish BMW a very bad experience. Usually it's a case of
"computer says no" when you think there might be a problem.
On 5 Jun 2006 03:22:53 -0700, email@example.com wrote:
Well, the engine management system changes the amount of fuel needed
when the engine warms up. My guess is that this changes the
characteristics of the engine a bit.
I would make sure all sensors are clean (in the intake) and make sure
there are no stored codes.
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