Geringe Motorleistung Ursachen | Posts 16+

Hi Robs,

Bertil means that certain errors (such as a complete failure of the LMM), for example, can be checked by the control unit and, if necessary, marked as faulty. Other errors (such as an LMM that is approximately 10% outside of the tolerance), are not checked and therefore not discarded.

Greetings
-Private

Drive the LMM-Killer AFB here, share my experiences.

I don't know exactly why, but when the LMM is gradually deteriorating, the fuel consumption increases significantly.
I notice this most clearly when I'm driving at around 80 km/h in high gear with cruise control; the difference is around 2 liters/100 km, according to the fuel consumption display. I also notice it at the gas station. With a faulty O2 sensor, I can't get the fuel consumption below 8 liters/100 km. With a new O2 sensor, I have one liter less. It's the same as with your Mazda, without the 'black smoke'! Even managed to get through the inspection with a faulty O2 sensor. (Should the emissions readings be better with a faulty O2 sensor?).
Can the specialist not directly measure the LMM values, then you would know if it is defective? It can't be that complicated. No problem with TDI.

Best regards, Johannes

Hi,
If consumption increases and the reason is not that the gears are being shifted further due to insufficient torque, then this would mean that the EDC adjusts the injection timing later when a lower air volume is measured.
It would be interesting to measure this again.

christians wrote:

Hi, If consumption increases and the reason is not that the gears are being shifted further due to insufficient torque, then this would mean that the EDC adjusts the injection timing later when a lower air volume is measured. It would be interesting to measure this again.

Hello

IMO, it's more likely due to an "excessively high" boost pressure.
Due to the insufficient LMM signal, the actual amount is reduced, while the boost pressure is not adjusted downwards -> the relatively increased exhaust backpressure reduces the engine efficiency.

Good morning,
Thank you again for your previous assistance in the lower thread.
Previous Issue: Increased consumption, performance and torque problems, instead of 81kw on a rolling road, only about 73kw
for a Mazda 626 Diesel with direct injection from the years 12-2001.
Now I simply pulled the plug from the LMM and the following happened: the turbo hole in the first one is more
has become better and otherwise the engine is unchanged.
Isn't this proof that LMM is the problem?
Why does the vehicle perform better or worse after I've disconnected the LMM connector? The vehicle also seems to be turning over.
Effortlessly reach the rev limiter?
I am now completely unclear about the function of the LMM.
Conclusion: If the engine runs no worse than with the sensor plug attached, even when the sensor plug is pulled out, then this must be
probably the problem is the loss of performance and consumption.
How do you see it.
What surprised me was that the fault memory in the Mazda did not show any errors.
Furthermore, I had experienced a faulty LMM on a VW TDI before, and this was immediately noticeable when the vehicle was
Emergency mode was activated.
I hope for many responses and a sunny Sunday.
Robs

First of all, thank you very much...
will inform you whether it was the LMM now...
a lovely Sunday
robs