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after you put the ICV valve in, 2 days later from the bumps on the road it might have changed its position a little bit because when it is sideways it does have a dramatic effect on the idle
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On E36's the ICV is held in place by a rubber collar, and it can't move or twist because the intake manifold hose is rigid. Unless you swapped that hose for an aftermarket one, that sucker ain't movin'.
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I cleaned out my TB once or twice, one time the car idled funny afterwards, but the carbon build up and cleaning product just had to be burnt away.
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I've read the same thing in the case of ICV's; that it sometimes gets worse before it gets better. Maybe that's all it is. It was doing a little better yesterday, so we'll see if it keeps improving.
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when last did you replace the fuel filter?
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Another good suggestion . . I haven't yet since I bought the car back in March. Been concentrating on the suspension & cooling up till recently. I'll change that along with the O2 sensor while I'm under the car. Then I'll clean up the TB & install new spark plugs. Then I'll see where I am from there. The problem isn't severe at all, I just wanna try and take care of it before the winter comes.