3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
90% sure your idle switch is either not adjusted correctly or has gone bad. My car did the same thing last summer, I had to remove the throttle body and adjust the idle switch then everything went back to normal. Also, it is not a TPS as it does not read any throttle position other than closed/idle. All it does is tell the DME if the throtle blade is closed or off idle/open.
Well I don't know why they call it a TPS if it isn't.
Since continuity is O.K. I would guess adjustment would be in order...
It shouldn't be listed or refered to as a TPS, if it is that is not correct for the M20 idle switch. When the switch is adjusted correctly you will hear a click from the switch just after the throtle blade starts to open. It should be in the bently on how to adjust the switch.
Ok as soon as I reinstalled the adjusted throttle switch and new crankcase ventilation hose, the idle dropped to 700 rpm's and 800 rpm's with the A/C on (if that). The hesitation on acceleration is gone as well.
There's just a tad of a sputter left that I hear in the exhaust. Maybe clogged injectors... that's a topic for another thread.
Thanks for all of the valuable help. Hopefully I can start helping others out soon.
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