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E30 Central locking pinout and routing

February 2, 2022

E30 Factory manual pinout and illustration showing the routing of the central locking system found on E30’s:    
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How to test E30 ICV Idle control valve (M20 Engine)

February 2, 2022

This is an excerpt from the factory E30 repair manual instructing how to mechanically and electrically test the ICV (idle control valve) for an M20 engine.
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Vacuum leak locations on E30 throttle body (M20)

January 1, 2022

In the vast majority of cases, vacuum leaks are to blame for poor or inconsistent idle issues on M20 engines found in E30’s. Vacuum leaks basically mean air that is entering the engine where the air flow meter has not had a chance to meter it. Unmetered air, is unexpected air, and as such...
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CNC ICV Elbow – Fix for ICV elbow vacuum leak E30 M20 engines

January 1, 2022

These CNC ICV elbows replaces your stock ICV elbow. The original elbow is press fit from factory and loosens over time. Once loose, you end up getting a vacuum leak and up until these there was no great way to solve the problem. Most people either try a glob of JB weld or silicone;...
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E30 Factory Wiring Diagrams in German

November 19, 2021

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E30 Cluster Pinout

November 18, 2021

Directly from the factory repair manual:
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Testing E30 alternator (E30 Not Charging)

November 14, 2021
Testing E30 alternator (E30 Not Charging)

In the world of alternators the one used on most all E30’s is quite simple and straight forward. The Bosch alternators are a a two post design, with D+ and B+ terminals. B+ (also called 30) is the larger of the two and routes through the starter, then the battery junction box and finally...
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Great clear pictures from E30 (M3) rebuild that show various seldom pictured angles

October 24, 2021

If you’re anything like me, before jumping into a job, or while ordering parts, you want to refresh your memory by looking at the area you are going to be working on. Problem is, with an E30, getting clear pictures of the underbody or stripped back engine bay or interior is fairly difficult. Luckily...
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E30 Idle Issues (erradic idle, high idle, idle hunting): 90% are caused by a vacuum leak

October 10, 2021

Near most idle issues are derived from unmetered air entering the intake past the AFM (Airflow Meter). Simplified, it means you have a hole in one of your connections, gasket matting surfaces or intake related hoses. Un-metered air is a fancy way of saying that you have additional air entering your system that the...
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Reducing odd fuel smell from E30 by changing fuel cap gasket (cap acts like the finger on a straw)

August 16, 2021

The E30 was built with with a vent-free fuel cap, and it was for a reason. If you’ve ever placed your finger on the end of a straw with liquid in it, you will have found that the liquid doesn’t fall out the bottom. Similarly, the 80’s fuel system is designed with this pressure...
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