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Do it Yourself

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

E30 Windshield Washer Spray Jet Adjustment

0
August 3, 2026
Photo of a BMW E30 windshield marked with the washer jet aiming distances 258, 405, 460, 265, 310, 473, 490 and 285 mm

Aiming the washer jets by eye usually ends up with the water landing too high, too low, or blowing clean over the roof once you are moving. BMW gives eight dimensions for it under procedure 61 71 504 – they locate four spray targets on the glass, two per jet. The method: Transfer distances...
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E30 Tweeter Repair Pin Step Files (better then STL) for 3D Printing

0
August 3, 2026

    Print them on their side: This matters more than anything else here. Do not print these standing up. A 3D print is always weakest at the layer boundaries. Print a pin upright and every layer line runs straight across the shaft, at 90 degrees to the load. Laid on its side, the...
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E30 Seat Hinge Removal (All E30 Seats – Sport, Comfort, 2 and 4 door)

1
July 19, 2026

To remove E30 Seat hinges, start by removing the tilt plastics: Then remove the two philips that hold the back cover on, then simply lift the back cover up until the top clips at the top of the cover pop out. Emphasis on pulling up towards the headrest, not out. After removing the plastic...
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E30 Seat Hinge Interchangeability (2/4 Door/Comfort/Sport) and Failure Point (Broken Seat Back Mounting Bracket)

1
July 16, 2026

E30 seats are notorious for breaking the brackets that mount the seat back to the seat bottom. The stamped metal used there has two failure points – one at the welded nut and one at the 90 degree bend. Fixing is possible by way of welding, but the bracket often re-fails slightly up or...
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Keyless Entry E30 Mod Equipped Originally with Factory Central Locking

4
January 19, 2026

Cheap keyless entry for a BMW E30 (LB-402 AliExpress or smaller LB-408): You can add keyless entry to an E30 for under ~$20 using an LB-402 keyless entry kit. The LB-402 (or LB-408) ties into the factory Central Locking Control Unit (CLCU) by triggering the E30’s lock/unlock request inputs. Where the E30 central locking...
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BMW Alpine CM5908 Radio Capacitor Electrolytic Bill of Materials (22 Caps to repair Amp)

0
January 19, 2026

BMW Alpine CM5908 Radio Recap — Electrolytic Capacitor BOM (22 caps) Posted for posterity, referenced from R3v. If you’re rebuilding the amplifier section of the BMW Alpine CM5908 radio, a full electrolytic recap is one of the best “baseline repairs” you can do. Electrolytics age, drift, and dry out over time, which can lead...
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Sanden Compressor conversion into an E30 (M20) originally fitted with Denso 10P15E

1
December 31, 2025

Sanden Compressor Conversions for M20-Powered BMW E30s M20-powered E30s were originally fitted with one of three air-conditioning compressors: Bosch, Seiko (largely identical to Bosch), or Denso. This guide specifically focuses on converting E30 M20 cars that were originally equipped with Denso 10P15E compressors to a Sanden compressor. The reason for this focus is the...
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BMW Radio CM5908 Alpine Radio Code Jumpers

0
November 21, 2025

It only takes 3 screws to remove the bottom panel of a BMW CM5908 Radio. There you will find the code jumpers; these jumpers, based on how they are soldered determine the radio code. Note where the jumpers are numbered TDC-0 through 5: Jump only TDC-5 to set code 25142: *Pictured is TDC-2 jumped,...
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BMW Pioneer KE-81 ZBM Repair Instructions (Cassette belt, LCD Bulb replacement, Code errors)

0
May 29, 2025

*The following is likely to be almost identical for the KE-83 KBM, the 4 channel version of this 2 channel KE-81 KBM radio. Important Radio Security Code Considerations: Cassette Mechanism Belt Issue: Over time, the original factory cassette belts degrade into a soft, mushy substance. Attempting to operate the cassette mechanism in this state...
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E30 testing all ABS speed sensors the easy way

1
May 4, 2025

Most places will tell you to try to track down each abs speed sensor connector, but really, you can just check all sensors right at the ABS computer module. To get to this module and plug only takes removing 3 half turn screws. With a multimeter you can check resistance on connector pins: 4...
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