Changes by last author:
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Problem solved
Turned out that the configuration somehow was using I259-6 for boost control. According to pinouts the boost control valve is connected to INJFET-7 (INJ-H). I never took the time to dig any deeper into the problem, since this was a clear error I changed the output selection for boost control and the engine now ran excellent. The problem may lie in the fact that I259-6 is connected to the carbon canister frequency valve control (not used with VemsAudiAan ?) but I never tried any other "wrong" output setting to see if it made a difference. User error probably.. I did copy the settings from a running Audi S4 which had the correct setting. I can't really explain what magic would have changed the output setting for the boost control function. Perhaps I can blame lack of quality control in vemsv3.ini + MegaTune. Still confused about this. ---- Tomas Audi S6 Technical data Audi S6 2,2t -96, AAN-engine, VEMS v3.3 with Motronic connector, Box no. 1986 * New trigger solution with cam Hall inverter * IAT is NTC type * Siemens 630 cc/min injectors. I have done one other Audi: MembersPage/MattiasSandgren/OskarAudiSFour But that one doesn't have the cam Hall inverter (but works flawlessly anyway). Here is the config, tables, MSQ and datalog of my problem: http://www.vems.hu/files/MembersPage/MattiasSandgren/TomasAudiSSix/ Short video 3gp format (plays with VLC): < http://www.vems.hu/files/MembersPage/MattiasSandgren/TomasAudiSSix/tomas_audi_s6_problem.zip (file upload doesn't allow 3gp ending so I zipped it) Problem description Above 4000 rpm the engine runs very well without hesitations or other problems, feels strong and runs with a clean sound. No sign of trigger, ignition or other ECU problems. The problem is below about 4000 rpm we have something that can be described as slight misfires or the engine simply cutting out. No real signs of problems in the datalogs from what I can tell. The idle is slightly rougher in quality than stock and the lambda value varies just a bit too much for this type engine. The daily driving is the "show-stopper". If the engine is given any load above light driving, like a strong acceleration it will appear to misfire. The datalog shows trying to accelerate in 3rd gear at low throttle, the engine cuts out rhytmically, 2nd gear is then used to accelerate past 4000 rpm and then given full throttle without any hesitation from the engine. There is no black clouds of unburnt gasoline, which is kind of strange. I have a mobile phone video of the car passing by with light acceleration in 2nd gear, I will upload it later. The injector pulsewidth in the datalogs look normal, no fuel cut in action from what I can see. No trigger errors either, unless someone can tell me how to tell from an LCD display page (mlp02?). What is the next logical step? Oscilloscope of the trigger signal? Gas analyzer will probably tell me something is wrong, but won't fix the problem. * try disable non-essential signals like boost, even tachout and iac ** boost_channel=62 is this OK ? Disable it for a test, just in case * can you check cam position wrt crankhome-VR ? ** "No trigger errors either" ... hmm... unlikely to be the problem Apparently bad settings * act_wot_channel=0E * act_rpm_channel=0E * knock_chan=01 (use F0) |