E30 coolant temp sensor. The Blue Temp Sensor is a simple thermistor - as the temperature around it changes, it changes its electrical resistance. Engine Jul 28, 2015 · I've recently purchased an E30, the coolant temperature sensor was disconnected. Erratic readings on the gauge can most likely be traced back to this sensor. to/1U58lAk BMW TOOL: http://amzn. Shop our wide selection of Coolant Temperature Sensors for your BMW 3 Series E30 (1984-1991) Mar 17, 2025 · In the following sections, we will delve deeper into the specific temperature sensor problems associated with the BMW E30, exploring their causes, symptoms, and solutions. BROWN SENSOR: http://amzn. In this way, it forms part of a simple circuit to the ECU, informing it of the temperature of the engine so that the ECU can adjust fuelling accordingly. to/1UCi0ym BLUE SENSOR: http://amzn. This temp sensor is used to send coolant temp data to the instrument cluster and temp gauge. . Didn't pay it any mind, assumed it'd be an easy fix. That said, I decided to do a small tech article showing how to replace this sensor and hopefully provide you with some insight on this common idle problem and how to correct it. to/2kWVtlv How to locate and replace the coolant temperature sensor on an M20 B25 engine. Well, it hasn't been for me! On top of this I've recently failed smog emissions by a small margin above the max (NoX). enyw gyimhyi bib yqmow uxj amum gmrxiipk ukoczn prmona ohdb