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Interesting Stuff

E30 early and late cruise control cables are the same (65711371394 = 65711386243)

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January 10, 2025

The ETK would have you believe that there are different cruise control cables for early and late E30’s, but that’s not true, 65711386243 supersedes 65711371394 and will fit both early and late cars.   One small note about orientating the cable correctly:   Reference this post on how to trouble shoot your cruise control,...
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Troubleshooting E30 Cruise Control Workflow

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December 21, 2024

These are the factory instructions to testing and troubleshooting the E30 cruise control system with additional clarification:   Using backprobes like this fit perfectly into the pin holes of the blue cruise control module plug:   *The English translation was incorrect for the last step and so it has been overwritten in green to...
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E30 Throttle Body Plate Idle Screw Adjustment

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December 20, 2024

There is never a reason to adjust the idle screw on a fuel-injected E30. Idle should never be mechanically adjusted using this screw or the AFM idle bypass screw. The Motronic ECU electronically controls the idle via the Idle Control Valve (ICV). The idle screw only opens the throttle plate by about the thickness...
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E30 Toolkit options

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December 17, 2024

All E30s, if unmodified, should have a basic tool set located inside the trunk: All tools were made by Heyco and stamped with the BMW logo. The kit included: 17/19mm wrench 12/13mm wrench 8/10mm wrench Pliers Allen key Screwdriver with a reversible blade (Phillips and flathead) Spark plug tool Plastic manual window crank (in...
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Fuel Hose standards (SAE and DIN)

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December 13, 2024

There are two main automotive fuel standards: one commonly referenced in North America (SAE) and the other in Europe (DIN). While these standards overlap in many aspects, they use very different naming conventions. Fuel hoses are typically categorized by pressure (low or high), permeation levels (low or high), and whether they are designed for...
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E30 M20 TPS (Throttle position sensor) adjustment and installation

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November 4, 2024

Per the BMW E30 Factory Manual:   Per Bentley manual: To set between 0.20mm and 0.60mm:   Failure Methods: It is commonly stated online that E30 TPS failures are caused by oil saturation. Crankcase oil can migrate down the throttle body shaft bearings and into the TPS, leading some to recommend drilling a hole...
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Understanding the Importance of a Diode in Your Fog Relay (PN 61311374631) E30 E24 E23

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October 17, 2024

If you’re in the market for a fog relay—particularly the now no longer available (NLA) part number 61311374631—here’s a crucial piece of information you should know before buying any replacement. The stock relay for this part comes with a diode, while most available replacements do not. This seemingly minor difference can cause some unexpected...
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Choosing the correct E30 M20 accessory v-belts

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September 30, 2024

Here are some nuances to understand when picking E30 M20 accessory belts. First reference this to understand how some belt manufacturers describe the same length of belt in different ways: Understanding V-belt lengths Li vs La (inner length and outer length) Alternator and Waterpump belt The factory belt size is 9.5X965 – PN 11511711091...
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Silver paint color for BBS and BMW Basketweaves

1
June 22, 2024

If you decide to paint your wheels instead of powdercoating (which you should): Is powdercoating bad for rims? Yes, and illegal in Germany. So is using heat to bend them back. There is an nth amount of silvers to choose from, and there is no real right or wrong, but everyone needs somewhere to...
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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 and auto E30 ECU’s and M1.3 didn’t always post date M1.1 ECU’s. The bad news is that no tuner has a fully disassembled dump of the ECU source code. Most just take the post compiled...
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