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Hook an ohmmeter to terminals 2&18. Loosen........ (archive)

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Posted by John A on March 22, 2002 at 21:14:43:

In Reply to: THROTTLE POSITION SWITCH. posted by jJON.(UK) on March 22, 2002 at 19:37:17:

...the mounting screws and rotate the TPS until the switch closes (zero ohms). Tighten the screws.
Once you`re sure the switch is working, hook up a digital tachometer. The tach on the instrument cluster is not reliable for determining idle speed. The base idle screw is a large slotted screw above the cam cover on the throttle body. Adjust to 880 RPM.
88 ///M3 Cinnabar

Having recently bought a 90 m3,I have decided to tackle its fluctuating tickover.I have replaced:manifold gaskets,plenum o rings,all hoses including breather pipes,cleaned and checked ICV.I found that the TPS was not showing any voltage at full throttle so this has also been replaced.the car know has a beatiful even tick over except it is at 1000 rpm.I think I need to reset TPS and base idle but not sure of the proccess,many thanks.

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