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CNC Throttle Body Booster Side Elbows – Fix for vacuum leak E30 M20 engines

March 3, 2022

These CNC booster side throttlebody elbows replaces your stock 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...
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Vacuum leak locations on E30 throttle body (M20)

March 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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E30 early and late shifter layout

February 3, 2022
E30 early and late shifter layout

Below is a breakdown of early and late shifter assemblies found on the E30. Early (84-85):     Late:
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E30 relay and control unit location illustration

February 3, 2022
E30 relay and control unit location illustration

Below is a quick visualization on where you can expect to find any of the 27 relays or control units found in the E30.  
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E30 Front and Rear subframe illustrations

February 3, 2022
E30 Front and Rear subframe illustrations

When talking through E30 componentry or work to be done, its helpful to have a full visualization of the front and rear subframe assemblies.  
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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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