We are used to the concept, that cylinders are numbered, starting from 1st, then follows 2nd, 3rd etc. Obviously, specialists of BMW AG dealer centers are using this Rough run menu… I don’t know, for what and how; obviously, the engineers of BMW AG are not using ISTA for their own needs – only in this way I can explain such fundamental errors of code and logic! Stratified charge performance check, NOx sensor. BMW 1 3 SERIES E81 E82 E88 E87 LCI E90 E91 N43 ENGINE CYLINDER HEAD ROCKER COVER. a) efficiency of 2nd cylinder (by firing order) = 5th cylinder (by placement) is around -13%; b) efficiency of 4nd cylinder (by firing order) = 6th cylinder (by placement) is around +5%; c) efficiency of 6nd cylinder (by firing order) = 4th cylinder (by placement) is around +10%. 6 cylinder inline DOHC 24v VANOS petrol engine, 6 cylinder inline DOHC 24v double VANOS petrol engine, 6 cylinder inline DOHC 24v Valvetronic, Double VANOS, aluminium/magnesium petrol engine, 6 cylinder inline DOHC 24v Direct Injection naturally aspirated, Double VANOS, aluminium/magnesium petrol engine, 6 cylinder inline DOHC 24v Direct Injection Turbocharged, Double VANOS, aluminium/cast-iron petrol engine, 6 cylinder inline DOHC 24v Direct Injection Twin-Scroll Turbocharged, Valvetronic, Double VANOS, aluminium petrol engine, V8 DOHC 32v Valvetronic, Double VANOS, aluminium petrol engine, V8 DOHC 32v Direct Injection Twin-Turbocharged engine, V8 DOHC 32v Direct Injection Turbocharged, Double VANOS, aluminium/cast-iron petrol engine, V12 DOHC 48v TwinPower Turbo, High Precision Injection, Double VANOS, aluminium petrol engine, 4 cylinder inline turbocharged diesel engine, 6 cylinder inline DOHC 24v turbocharged diesel engine, 6 cylinder inline variable geometry turbocharged aluminium common rail diesel engine, V8 common rail DOHC 24v turbocharged diesel engine, Motorsport/S - Engines produced by BMW Motorsport GmbH. Stratified charge: disabled. ISTA reads all information regarding car’s configuration and chooses correct order for cylinders (or at least – so would the software of dealer’s level supposed to work). Usually DME measures time – how much times passes, while the flywheel carries out sector, dedicated to each cylinder, that’s why usually reduced (<0) Rough run data value means – flywheel has turned faster, mechanical efficiency of the cylinder is increased. ISTA: as for this tool the turning off the switching of cylinders is not available; to find out, how the Rough run data are to interpret, we have to do the following: a) open ECU call-up menu, choose Rough run data for displaying; b) take off the decorative valve cover, turn off the ignition coil (remove the connector) of the 1st cylinder for short time (several seconds); c) observe Rough run measurements for cylinder No.1 (whatever the displaying order of cylinders would be, 1st cylinder always will be a 1st cylinder of the 1st bank). Even more – to make a situation even more complicated, it’s possible, that the numbering of cylinders doesn’t match one, we expect. Part 1. Re-adapting of the automatic transmission, The problems of the injectors and misfires, Car with N57N engine and very low mileage, F10/11. And, for example, for the “line engines” numbering is started from the front of the vehicle. In INPA Rough run menu, learnbit (Status: Segmentadaption) of flywheel adaptations has to be colored – only then Rough run data of cylinders will show correct values! Smooth run. This entry is dedicated to the topic – how to work with Rough run data, how this information can help us in our work. At first – to evaluate, the performance of which cylinder is disturbed (less efficient), we have to understand (clarify), which data are displayed (smaller efficiency is an indication, increased above 0 or decreased above 0) and have to understand, how the cylinders are measured. 4 cylinder inline DOHC 16v Valvetronic petrol engine, 4 cylinder inline DOHC 16v Direct Injection naturally aspirated petrol engine, 4 cylinder inline DOHC 16v Double VANOS petrol engine. Additionally – exactly the Lambda probe of 2nd bank shows rich mixture (U<2.00V = Lambda around 0.99) – obviously, exactly the 2nd bank has some problems with fuel distribution between cylinders. And at last – I’ve identified cases, when (obviously, by human factor/result of mistake) the cylinder order even for the N52 series engine don’t matches nor firing, not placement order! Short version – I don’t understand, how BMW AG can offer to its diagnostic specialists a toll, for which during several years very gross mistakes are not corrected? N43: 4 cylinder inline DOHC 16v Direct Injection naturally aspirated petrol engine: petrol: 1995cm3: 2007-now: N45: 4 cylinder inline DOHC 16v Double VANOS petrol engine: petrol: 1596cm3 - 1997cm3: 2004-now: N46: 4 cylinder inline DOHC 16v Valvetronic petrol engine: petrol: 1796cm3 - … • What are the main differences between NOXEM emulator and ‘’usual’’ emulators? I deliberately use the term “usually”, because not the developer of DME or INPA/ISTA doesn’t guarantee exactly such interpretation. Throttle and accelerator pedal. My problem is, INPA recognises my injectors in say cyl 1,34,6 (2 and 5 obviously not used) Now I know that the cyl numbering goes from front to back, so 1 is closest to the radiator, 4 closest to the dash/back on the engine. Rough run data are measured in idle and in range of small RPM. How can offer a diagnostic tool, which basic functionality doesn’t work? MSV70/80, MSD80 and Lambda probes. INPA uses the same script for N43 and N53 series engine – the “mess” with cylinder order displaying us guaranteed – there is a menu, where the cylinder order of N43 series engine don’t matches nor firing, not placement order! And again it’s recommended to make notes – they will be useful in the next diagnostics sessions. It is easier (more logical) to create all software performance. True though, harsh reality will introduce its corrections. b) values of Rough run data, which matches efficiency 0; c) displaying the order of cylinders in Rough run menu INPA/ISTA; d) displaying order of cylinders in injector turning-off menu (if it works); we can evaluate the mechanical efficiency of each cylinder! Rough run. Unfortunately, Rough run data of many DME versions (by efficiency 0) exceeds data, displayed in ISTA Main menu (displaying range -200 .. +200), which means – unfortunately, it’s not possible to calculate, what efficiency would correspond, for example, +/-5%. Even more – we can try to find a leaking injector, turning off the engines one by one and evaluating Lambda, which is reported by wide-band Lambda probes – more information here. The menu states, that the injector is turned off, but the engine performs as before; as we see, possibility to exit the ECU call-up menu is turned off; 2. Short conclusion – ISTA (Main menu: Vehicle management/Service function) IS NOT suitable for analysis of Rough run data. I planned to describe both ISTA and INPA, but…. Please use part numbers provided to confirm fitment to your car BEFORE buying, incorrect purchases are subject to a 25% return surcharge. This is a small difference between cylinder efficiency and subjectively the engine works very evenly (no permanent vibration observed). Let’s start with basic things: Rough run data display mechanical efficiency of each cylinder. The N43 B20, N45 B16 and N47 engine variants as fitted to BMW 116i and 118i vehicles can suffer camshaft cap failure following faults which can cause the timing chain to either jump or break. But, understanding, that INPA is not available in dealer centers, and also several diagnostic sets (ICOM) are performing only after ISTA, I decided to try out this – official – tool.

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