Hi, I own my RS250 now for about almost a year and i absolutly love it. The only thing is, it has a small misfire while ideling. When driving you dont notice a thing. Its like a small cough from the exhaust. Well now comes the other thing, i owned a diffrent RS250 a few years ago. And it had exacly the same problem! And i changed everything i read on this forum. The injectors, the EVAP. Lambda's. Sparkplugs + coil packs. Even the DMF. But with this one, i had a compression loss of 2 bars. So i thought that was the problem but the car already costs me a few 1000 euros. Thats when i sold it. Before i bought the one i have now, i did an compression test and its absolutly fine. I dont want to start again replacing eveything that could have something to do with it. Does anyone know where to start? Or how to diagnoze such a problem? The car is tuned, with an KTR intercooler and Forged / KTR cold air intake. KTR Racing exhaust with original downpipe. with 61k miles. Never missed a service, and there has never been a cutback on the costs.
