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How to test E30 Bosch AFM (Bench test)

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July 9, 2024

There is only one correct way to test an E30 AFM, and that’s by using an oscilloscope. The most common mode of failure is the wearing of the carbon strip within the AFM. In simple terms, the AFM is one big variable resistor. It takes a +5V supply, and the carbon strip provides variable...
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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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Silver paint color for BBS and BMW Basketweaves

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June 22, 2024

If you decide to paint your wheels instead of powdercoating (which you should): Is powdercoating bad for rims? Yes,...
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E30 ECU variant programming specificity between manual and auto cars

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May 22, 2024

Counter to popular narrative on E30 forums (based on self perpetuating hearsay), there are variant code differences between manual...
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3D file for E30 battery vent box grommet for pre 1988

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May 22, 2024

The grommet for the pre-1988 E30 is NLA, but its nothing a bit of TPU (95a or softer) can’t...
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E30 front hub bearing dust caps (NLA/Shortage solution)

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May 22, 2024

There are no aftermarkets to the now years backlogged E30 front hub bearing dust caps. There are two options:...
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