Hi
Problem description:After deleting the DTC / resetting learned values, the idling speed remains at 800 rpm for a certain time. The idling speed (nmot) then starts to rise to 920 rpm. The target idling speed (nsol) also increases to 870 rpm.
From this point on, it is difficult to increase the engine speed to 1400 rpm with the accelerator pedal when the vehicle is stationary. At first, the engine does not respond to the accelerator pedal and then starts to fluctuate between 1200 rpm and 1600 rpm.
These problems occur when the air conditioning is switched off. When the air conditioning is switched on, the idling speed remains at 800 rpm. In addition, the engine speed can easily be increased and held at 1400 rpm with the accelerator pedal when the vehicle is stationary.
Baseline: S4 B5 D-Box- MAF OEM
- Throttle valve OEM
- Thicker cylinder-head gasket
- Larger fuel injectors
- Larger turbochargers
- KFMIRL --> up to and including 60% relative torque unchanged.
- KFMIOP --> up to and including 50.251% cylinder filling unchanged.
- KFZWOP --> up to and including 50.251% cylinder charge unchanged.
- KFZWOP2 --> up to and including 50.251% cylinder filling unchanged.
- KFZW --> up to and including 50.251% cylinder filling unchanged.
- KFZW2 --> up to and including 50.251% cylinder charge unchanged.
- WDKUGDN --> up to and including 760 rpm unchanged.
Analysis:First spark advance is decreasing before throttle plate angle is increasing.
After engine start (timestamp 9 sec.) up to timestamp 37 sec.
----------------------------------------------------------------------
- Ignition angle --> 2.25 - 11.25 BTDC
- EngineLoadRequested (rlsol_w) --> 12%
- EngineLoadRequested (rl_w) --> 10.2% - 10.8%
- fkmsdks_w --> 0.843751
Timestamp 37 sec. up to timestamp 57 sec.
-------------------------------------------------
- Ignition angle --> Spark Advance is decreasing
- EngineLoadRequested (rlsol_w) --> 12%
- EngineLoadRequested (rl_w) --> 10.7% - 11.2%
- fkmsdks_w --> 0.843751
Timestamp 57 sec. up to timestamp 69 sec.
-------------------------------------------------
- Ignition angle --> Constantly 2.25 BTDC
- EngineLoadRequested (rlsol_w) --> 12%
- EngineLoadRequested (rl_w) --> 10.7% - 11.2%
- fkmsdks_w --> 0.843751
Timestamp 57 sec. up to logfile end (timestamp 88 sec.)
---------------------------------------------------------------
- Ignition angle --> 1.5 - 2.25 BTDC
- EngineLoadRequested (rlsol_w) --> 12%
- EngineLoadRequested (rl_w) --> 11.2% - 12.4%
- fkmsdks_w --> 0.843751
Questions:Why does the ME7 behave like this? Is it because the engine control unit is trying to match rl_w to rlsol_w?
