My Audi 90 2.3 NG had when I bought it, the problem that the idle was always so at 1500 rpm, warm or cold almost no difference (KLR retrofitted). Thought first cold running regulator dirt but after extensive testing by me this was found to be OK. Well then I once thawed the idle switch, which showed when the throttle flap was closed Infinitely, then pressed the switch with the finger and see there, about 3Ohm. plug pulled from the switch, u nd LL contact bridged, then it ran first in idle, then turned then always so on 1500 and dropped again to approx. 1000, before it turned up again and all this always so in a period of 1 to 3 sec. but always nice even. When I give then some gas it runs clean, how this behaves during the ride I do not know because the Fzg. is deregistered… Oh yes, the whole happens only when it is reasonably warm, is probably due to the warm running phase and the KLR falsified t, because it turns the first 5 min higher anyway. Today I then renewed the valve cover seal and also immediately examined the idle switch. There seems to be something broken off from the actuation, then I drilled a hole in the “heel” which normally presses on it and turned a screw in, which presses on the switch, in the LL understands itself. Well everything back together, let warm run, switches works because the above described problem again appearance. Motor turns up, falls a b, turns high… I then took a hammer and knocked on the idle valve, didn’t help. Idle valve removed, tried to start, runs no… Is also clearly the pull a lot of wrong air if the part is missing. So the valve observes when the organ is missing: nothing happens in the first second, then it goes completely open and remains open until I stop orgling, is the normal? What is still important if I pull the plug off from idle switch and full load switch Then it just turns higher, but doesn’t fall off. If I pull the plug off the idle valve the problem will only get worse but wouldn’t it have to go out? Then what else, when I saw after the switch, it seemed to me that the small flap of the throttle valve was bent towards the air filter, is the normal? Sry, which now became so en Roman, but I wanted to describe it exactly. Thank you!