And again it’s recommended to make notes – they will be useful in the next diagnostics sessions.ī) values of Rough run data, which matches efficiency 0 Ĭ) displaying the order of cylinders in Rough run menu INPA/ISTA ĭ) displaying order of cylinders in injector turning-off menu (if it works) The procedure is simple – again, one by one, turn off the cylinders (using INPA menu) and by Rough run data check, in what order they are switched off. When the cylinder displaying order (for current loader) on the screen is known, its possible to check, in which order the cylinders are displayed in cylinder switch-off menu. Of course, if corresponding INPA loader is used repeatedly, it’s no need to check the cylinder order – it’s enough to check your notes or recall your memory.Īttention: INPA offers (and usually this menu works, unlike ISTA) turning off of cylinders (injectors). If current INPA loader is used for the first time, it is useful to check the sequence of ALL cylinders, one by one turning off (for several seconds) their ignition coils and observing Rough run data. When the “polarity” and scale of Rough run data are clear, we have to identify, in what order cylinders are numbered.
#Run inpa bmw software
It’s important to make these calculations – for some software releases absolute values of Rough run data differs for even 100 (!!!) times – that’s why, when talking to Rough run, I never mention absolute values (without connection to 0 efficiency they will not give any information). In first case it will be: +/-0.4 in second: +/-0.01. Īccordingly – it’s possible to evaluate, which value will correspond to the cylinders if they will work with, for example, +/-5% unevenness. This value can be significantly different for different versions of DME!įor example, there are versions, where 0 efficiency by INPA will be displayed around +8.0 units (typically for N53 N54) there are versions, where the 0 value will correspond to +0.2 (typically for N43). In the image: ISTA Rough run data (ECU call-up menu).Īlso, INPA usually shows similar “polarity” of Rough run data – decreased efficiency of the cylinder is displayed with >0 data value.ĭisconnecting the ignition coil of the 1st cylinder can see, what value INPA shows when cylinder efficiency is 0. Short conclusion – ISTA (Main menu: Vehicle management/Service function) IS NOT suitable for analysis of Rough run data.
+200), which means – unfortunately, it’s not possible to calculate, what efficiency would correspond, for example, +/-5%.
Unfortunately, Rough run data of many DME versions (by efficiency 0) exceeds data, displayed in ISTA Main menu (displaying range -200. Usually DME measures time – how much times passes, while the flywheel carries out sector, dedicated to each cylinder, that’s why usually reduced (0.Īttention: Rough run data, displayed by ISTA:Ī) displayed in ECU call-up menu coincides with data, displayed by INPA ī) displayed from Main menu (Service function) shows 100/256 times increased values – they can drop out min/max range (+/200 units). It’s interesting, that INPA stops displaying Rough run data, as soon as DME confirms, that it’s not idle mode anymore, instead, ISTA (from the Main menu) continues to display data also till higher RPM (to 1500. Rough run data are measured in idle and in range of small RPM.
#Run inpa bmw how to
DME, measuring the momentous speed of the flywheel, measures the efficiency of each cylinder and, knowing, in which cylinder the fuel burns in the exact moment, knows, how to calculate relative contribution (comparing to other cylinders) of a current cylinder. Let’s start with basic things: Rough run data display mechanical efficiency of each cylinder. I planned to describe both ISTA and INPA, but… True though, harsh reality will introduce its corrections. This entry is dedicated to the topic – how to work with Rough run data, how this information can help us in our work.