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Do it Yourself

A place to find DIY guides to doing car repairs/mods/etc.

Testing E30 alternator (E30 Not Charging)

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November 14, 2021
Testing E30 alternator (E30 Not Charging)

In the world of alternators the one used on most all E30’s is quite simple and straight forward. The Bosch alternators are a a two post design, with D+ and B+ terminals. B+ (also called 30) is the larger of the two and routes through the starter, then the battery junction box and finally...
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E30 Idle Issues (erradic idle, high idle, idle hunting): 90% are caused by a vacuum leak

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October 10, 2021

Near most idle issues are derived from unmetered air entering the intake past the AFM (Airflow Meter). Simplified, it means you have a hole in one of your connections, gasket matting surfaces or intake related hoses. Un-metered air is a fancy way of saying that you have additional air entering your system that the...
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Reducing odd fuel smell from E30 by changing fuel cap gasket (cap acts like the finger on a straw)

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August 16, 2021

The E30 was built with with a vent-free fuel cap, and it was for a reason. If you’ve ever placed your finger on the end of a straw with liquid in it, you will have found that the liquid doesn’t fall out the bottom. Similarly, the 80’s fuel system is designed with this pressure...
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E30 Radio: Alpine CM5905, CM5907 and Pioneer KE-91ZBM, KE-92ZBM display LCD Bulb replacement

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July 13, 2021

Alpine CM5905, CM5907 Bulb: T1-1/4 12v 75ma (4mm) If you follow this video along until 3:12, it will be clear how to remove the bulb holder, then all you need to do is unsolder and resolder the new bulbs. Pioneer KE-91ZBM, KE-92ZBM Bulb: T1 8v 60ma (3mm)
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Clean your E30 water drains or face flooding and rust

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June 25, 2021

Other than a coolant leak around the heater core, most wet carpets are a byproduct of the water drains being clogged. The water has nowhere to drain and backs up and flows into where it shouldn’t; either your interior or settles and causes moisture/rust where it shouldn’t. The good news is that cleaning the...
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E30 No Start Troubleshooting

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June 1, 2021

E30Zone already has a great resource and flow chart to follow along with; in part this article is to backup that great information, but also to add onto a couple things to check to quickly and effectively rule out common issues related to no start conditions. Crank no start condition: Check to see if...
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BMW and Bosch release Gen 3 injectors for E30 M20B25

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April 21, 2021

OEM injectors are pintle design; good for its time, but there have been many generational iterations of fuel injectors since. Recently BMW aligned with Bosch to release a direct replacement 14.5lb gen 3 injector that is 4 hole (disc type). 4 hole injectors provide for much better fuel atomization when compared to pintle design;...
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Fixing floppy E30 AC vents

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April 19, 2021

Fixing your AC vents so they are no longer floppy is easier than you think. All you need is: Flat head screw driver Nylon washers 20 min To remove an AC vent all you have to do is point it down until you feel it click, then with a thin screw driver carefully push...
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Painless Power Brakes for E30 V8 swaps (Remote Hydrovac Booster)

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February 28, 2021

If you’ve been researching doing a V8 swap into an E30, you’ll quickly learn that one of the major dilemmas is how to solve the brake booster problem. With a V8 swap, there is no room for any kind of brake booster in the stock location. In the early years, the solution was to...
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Leaking hydraulic sealing copper or aluminum washer? Can’t get it to seal? Use a dowty (bonded washer).

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January 17, 2021

Most automotive hydraulic applications use a copper or aluminum washer for sealing. The idea is that the two surfaces are near perfectly flat and all that is needed is a hint of squished copper or aluminum. A small gouge, unevenness, or slop in the mounting threads can mean the squish of a copper or...
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