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E30 M20 Evap Fuel Tank Breather Valve Replacement Tips

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April 16, 2023

Perhaps one of the least understood components on the E30 M20 is the EVAP Fuel tank breather valve. If the valve is stuck open or if the hose has a tear, it will cause a significant vacuum leak. The green hose connects to a brass barb on the underside of the throttle body. It...
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E30 M20 often missed important part of a timing belt job (intermediate shaft sprocket gear)

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March 8, 2023
E30 M20 often missed important part of a timing belt job (intermediate shaft sprocket gear)

So you’ve heard that you should change the timing belt on an M20 every 50k miles or 4 years (whichever comes first), because in case of failure the valves will hit the pistons, rocker arms will break, and you’ll be looking at a top end rebuild or a new engine. But what many people,...
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Sound insulation (Jute) for aftermarket E30 underpanels

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August 14, 2022

If you’ve purchased an aftermarket underpanel for your E30, you’ve probably realized it doesnt not come with sound insulation. This sound insulation is called Jute. OEM PN 51488229734 provides for just enough insulation to do one under panel.   The insulation has one sticky side and one cloth side; doubling the layers will make...
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Vacuum leak locations on E30 throttle body (M20)

2
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 and other older BMW VIN decoding information

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February 15, 2024

If you ever wondered how the E30 VIN number decodes, below are the instructions directly from BMW. What you...
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Diagnosing Bad Wheel Bearing Side-to-Side Play

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February 14, 2024

Here’s how to diagnose a bad wheel bearing by checking for side-to-side play, which can help isolate the issue...
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Comprehensive Guide to Checking Your Car’s Charging System

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February 14, 2024

Maintaining the charging system is vital for any vehicle’s reliability. This streamlined guide covers the essential steps for a...
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Replace your AC refrigerant low side and high side valve cores without leaking out refrigerant

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January 17, 2024

After 30+ years the tiny seals in the E30 AC system should be changed; its one of the most...
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