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Contaminated O2 sensor will do this, very steady (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Bill R. on October 19, 2001 at 14:45:26:

In Reply to: rhythmic idling... posted by joe on October 19, 2001 at 13:22:55:

and even up down up down up down usually around the 50 rpm or so difference, another possibilty is the icv, Idle control valve..

'90 535i...

i have this rhythmic idiling from my car and don't know what i should check first... i haven't gotten a bentley's yet neither... but soon.

everything works great, except for when i'm idiling... it goes up and down, up and down... the tach doesn't jump though... just the engine idling up and down.

could it be a vacuum leak?? icv?? cap?? rotor??

any suggestions would be greatly appreciated...

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