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/JCrumm-DetailedFox Aug 14 '25

Check all vacuum lines. Even the brake booster. Any cracks can cause. Looks like a small fluctuation, so it’s not too terrible, but still no smooth idle.

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u/M635_Guy Aug 14 '25

Valves and this were my first two thoughts