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BMW E30 3-Series 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.
Last Updated: 07/15/2019
Parts Group: Throttle position sensor
]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.
- Throttle position sensor (Bosch number 0 280 120 302), as on: E23 with M30B32 engine, E24 with M30B32 engine, E28 533i, E30 through 03/1987
- Throttle position sensor, as on: E23 1981 only, E30 with M10 engine, Part Number: 13631273265
- Throttle position sensor, as on: E28 528e through 02/1987, E30 325 325e 325es through 1987, E30 M3, Part Number: 13621273277
- Throttle position sensor, as on: E28 528e with super eta engine, E30 with M20B25 engine E30 with M20B27 super eta engine, E34 with M20 engine, Part Number: 13631710559
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.