Moin Moin my dear friends, I have already used the SuFu but did not find a satisfactory answer to my question. My problem is this: On cold engine my car has speed fluctuations in idle, it varies between 800-950 revolutions, it does so until it is really warm, i.e. about 10-15 km. On warm engine it does not do it. What has already been done against the speed fluctuations or is new: -Lambdasonde new -DK clean t -Zündkerzen neu -Motor sprayed with brake cleaner, but no change in speed What would your tips be that I could check next? Errors in the FS are not stored. I would like to check the DK again because the in the V70 yes Kaka should be, how do I do it best? With a tester? If so, which? What values should come out of it? Further it could be the idle controller? If yes, would it not have to cause speed fluctuations on warm motor? It acts around a V70 I 2.4 140hp with 5 gear Aut EZ 2000 Oh yes, I almost forgot, he has a low cracker than if it would come from the hydros, maybe there is something known or has to do with my problem? I thank you very much for your great help!!!!! Gruss Toni