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Interesting Stuff

Baum Iscan/CS2000/Vscan OBD1 User Manuals (BMW, Mercedes, Volvo, VW, AUDI)

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September 21, 2026

Here are scans of the instruction manuals for the Baum Tools iSCAN, a hand-held diagnostic scanner for European cars. The manuals refer to the scanner as both the iSCAN and the CS2000. It uses a plug-in memory module and adapter cable for each make, and each make came with its own manual: BMW, Mercedes-Benz,...
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Factory BMW E30 Pioneer KE81 ZBM and KE83 ZBM Radio Owners Manuals

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September 20, 2026

Here are the PDF scans of two factory radio manuals. One is for the Pioneer KE-81 ZBM, and the other for the KE-83 ZBM. Pioneer KE-81 ZBM, Anti-Theft Radio Pioneer KE-83 ZBM, CD-Ready Radio
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E30 A/C System Oring Sizes

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August 16, 2026

For the E30 A/C system, the main line-fitting O-rings are standard SAE sized. BMW confusingly identifies them by the O-ring’s approximate ID rather than the hose size and does so in mm. Because of the standard SAE sizing, you can can order oring kits much more widely and readily from suppliers like four seasons...
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BMW E30 Motronic 1.3: Comparing 173 vs 525? (Work in progress)

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August 14, 2026

Binary comparison of Bosch Motronic 1.3 173 and 525 ECUs, including coolant enrichment, cranking fuel and ignition, and every identified closed-loop idle-control table.
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BMW E30 On-Board Computer (OBC): Functions, Inputs, and Self-Checks

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August 12, 2026

A practical guide to the full E30 OBC: its displays, sensor inputs, trip calculations, speed warning, temperature alert, CODE immobilizer, coding plug, and built-in checks.
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BMW E30 Heating and Air Conditioning System: How It Works

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August 12, 2026

How the E30 heater and air-conditioning systems route air, control refrigerant pressure, operate the auxiliary fan, and respond to the dashboard controls.
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How Bosch Motronic (M1.1, M1.3) Manages Fuel and Ignition in the BMW E30

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August 12, 2026

A system-level explanation of the Bosch Motronic inputs, fuel calculations, ignition mapping, idle control, and emissions hardware used across several BMW E30 applications.
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E30 M20 Denso Suction Line OEM PN

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January 31, 2026

The BMW ETK for the E30 is generally excellent, but it falls short when it comes to A/C part number references. This is especially true for M20-powered E30s, which were equipped with three different compressors – Bosch, Seiko, and Denso. While the Bosch and Seiko setups share the same A/C lines, the Denso configuration...
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E30 M20 Early 1987 and Earlier Radiator Options

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January 8, 2026
E30 M20 Early 1987 and Earlier Radiator Options

It’s become increasingly common for owners to convert early E30 M20 cars to the later-style radiator setup. However, that conversion requires a long list of additional parts—new hoses, mounting brackets, water pump, coolant crossover, expansion tank, and more. In reality, this conversion is completely unnecessary. The trend has largely been driven by the assumption...
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E30 Trunk Rubber Floor Mat Liner

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May 30, 2025

Lloyd mats offers a trunk mat pattern for the E30 that fits well overall. It appears to include a bit of extra material near the battery tray area—likely to accommodate E30s with batteries mounted in the engine bay. It’s not a major issue; just a slight trim is needed, and everything fits perfectly. Details:...
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