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Tech Article

BMW E30 3-Series Throttle position sensor

Last Updated: 07/15/2019
Parts Group: Throttle position sensor
This article discusses the throttle position sensor (a.k.a. TPS), for the BMW E30 with the main focus being on the symptoms of when you would be prudent to suspect the TPS.

]If you're not here for the technical analysis but would rather buy a used unit from us, guaranteed to work and fit, then please select the link below.The information herein is based on a recent purchase. The customer's car's throttle was hunting instead of having a steady idle.

Since the TPS, when working well, switches the fuel injection between idle more and non-idle mode, it seems logical to assume that the former was not being activated, and the latter cannot do a good enough job of keeping the idle steady -- wwhich is why there IS a separate mode for idling. On the E30, that separate mode uses a different set of components, such as the idle control valve vs. the mass air flow sensror (a.k.a. air flow meter).

The problem vanished when he replaced his suspect part with a good used part from us.
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