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More about flywheel adaptations: see entry about flywheel adaptations.
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#Bmw inpa for n51 engine manual#
To perform the flywheel long-term trim, speed up in 4-th gear to 4000 RPM, and, lay off the accelerator pedal (use the manual mode, if your car has automatic transmission), slow down to 2000 RPM. First driving session will be with switched off (unheated) Lambda probes – the flywheel data long-term trim will be in progress.
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After deleting long-term fuel trims, you have to plan both time (about half an hour) and place (calm stretch of road) to create new long-term fuel trims.ġ. I recommend to delete fuel trims to warn engine – then it’s possible to evaluate settings for new long-term fuel trims. Note: by deleting adaptations, the synchronization of cylinders (long-term trim for crankshaft sensor/flywheel long-term trims) are also deleted, so the first session of driving will be with unheated Lambda probes (see description below).Įxample: clearing of adaptations using Vehicle management/Service function: Or: select Vehicle management/Service function/Power train/Engine electronics/Adjutment functions/Delete adaptations (variants). In this case you just have to follow the instructions. All LTFT (offset and multiplicative type) should be 0,00.ĭeleting fuel trims via ISTA D: in case the engine has recorder error messages regarding uneven running (in Homogeneous and/or Stratified charge injection modes), or, if the replacement of injector(s) is confirmed, ISTA D creates sub-part of service plan: deleting the fuel trims. All learnbits should be UNCOLORED (white).
#Bmw inpa for n51 engine series#
Note: For N43/N53 series engines: if OEM NOx sensor installed, please perform Forced desulphation session BEFORE clearing of adaptations, as described here.Ĭonfirmation of successful clearing of adaptations: Note: the engine has to be switched off, ignition = ON.ĭ) press Shift + F9, to delete long-term fuel trims. The old fuel trims can be deleted both in INPA and ISTA D.ĭeleting fuel trims via INPA (the sample is valid to N43/N53 engines, but the same principle has to be performed to other engines)Ī) in INPA choose engine: MSD80 for N43/N53 ī) choose deleting option for fuel trims: press F8 ĭ) press F6, to delete long-term fuel trims. This time more detailed about long-term fuel trims. During all engine’s lifetime fuel trims are corrected and renewed, according to real situation (fuel, its quality, component wear and change of parameters, etc.).Īdaptations has to be renewed, if any of mentioned components is been replaced: sensor, ignition coils (after misfire), injectors, not to mention more serious details (VANOS, pistons, etc.). For modern engines, adaptations are created for: accelerator pedal, throttle, VANOS, crankshaft, camshaft and knock sensors, fuel and ignition supply, wide-band Lambda probes, NOx sensor, etc. Long-term fuel trim coefficients and maps describe differences between perfect function of several technical solutions (for example, equipment unit & sensors) and current performance in real time (parameters and curves) – observing unit’s and/or sensor’s performance, engine “learns” and makes corrections in its performance. To perform adaptations: to create an initial maps for all management systems (long-term fuel trim map, ignition map, etc.) and coefficients (multipliers for cold engine fuel corrections, etc.). What does it means – to perform adaptations? Performing adaptations is very important stage after replacing any meaning component of engine.