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E30 Coolant flow directions (M20)

February 3, 2022
E30 Coolant flow directions (M20)

Below is the coolant flow direction of all the piping and equipment on a M20 engine.
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E30 Factory fuse layout

February 3, 2022
E30 Factory fuse layout

Most publicly available fuse layouts are perfectly fine, but for those who want reassurance, the below is the layout described in the factory E30 repair manual.  
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E30 early and late fuel tank diagrams

February 3, 2022
E30 early and late fuel tank diagrams

Early and Late E30 fuel systems mainly differ by the fact that early runs a two pump system and late runs a single pump. With that primary difference, routing of fuel lines and vapor lines is also notably different.   Early:   Late:
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E30 Cluster Pinout

February 3, 2022
E30 Cluster Pinout

Below is the factory pinout of an E30 Cluster:
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E30 AC temperature pressure chart

February 3, 2022
E30 AC temperature pressure chart

Normally, we are told to fill AC systems by weight. That is normally because pressures change greatly depending on temperature. These seldom seen AC pressure charts allow us to directly cross check and test our systems for optimal performance.    
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E30 Factory ride height spring part numbers

February 3, 2022
E30 Factory ride height spring part numbers

There are numerous OEM E30 spring part numbers, and the below is the breakdown of what net effect each will have on ride height and how they interrelate with what options you may add or subtract in your E30.  
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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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