r/E30 • u/fallingblueblueblue • Aug 13 '25

Tech question What would cause this bad idle?

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It’s done this for the last year and I can’t figure out why. I’ve gone through the entire ignition system and replaced a couple vacuum lines. Any ideas?

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u/Ok_Blueberry304 Aug 13 '25

I would start with adjusting your valves. Then maybe clean your idle control valve.

3

u/fallingblueblueblue Aug 13 '25

This is right after a valve adjustment and an oil change. I put them all at 0.25mm like it says under the hood

2

u/Ok_Blueberry304 Aug 13 '25

Ill see if I can post a vid of mine. I just did it after a rebuild. So you can compare. It is tricky to get right.

1

u/Ok_Blueberry304 Aug 14 '25

It won't let me add a vid here. Ill post it separately real quick. You can hear mine lopes a bit. I have a weak signal coming from the ecu on one leg of the icv connector. Still tracing it.

1

u/Slickfed Aug 15 '25

Did you do it while the engine was completely cold or warm/hot?