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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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Alpine CM5905 and CM5907 Radio replacement switches

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November 30, 2023

Many people who restore old Alpine radios just keep taking switches from other radios; but in general, to get...
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OBD1 E30 Diagnostics demystified

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November 24, 2023

Every wondered if you could connect an OBD scanner and get useful data out of the E30? Most forum...
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Affordable steel E30 Key blanks (PN 51211900892 for E12,E21,E23,E24,E28,E30)

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November 23, 2023

The biggest issue in north america is that most non-dealer replacement keys for the E12,E21,E23,E24,E28 and E30 are made...
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VDO and Motometer E30 SI board Capacitor electronics and batteries (lithium battery board)

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October 18, 2023

To replace the batteries and capacitors on a lithium battery E30 SI board you will need: Two CR14250SE-FT batteries...
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