29+ Bmw M40 Rough Idle
Images. Almost sounds like a back fire thru air intake. Car idles rough on cold start, rpm fluctuates, shuts off.
(530i in my case).it usually seems to be a cold idle misfire that (usually!) goes away if you just drive off.in my case, it has been there since i bought the car two years ago. The bmw repair guide recommends replacing both valves when fixing a bmw with a rough idle on startup. Here is my idle speech that i posted to the forum some time ago.
I'll tell you what i found out to fix mine.
A bmw e46 rough idle repair is a fairly simple job that requires replacing your disa and idle control valves. In my 435i, sometimes the idle is smooth, but frequently it stumbles. I know that idle instability could come from various different issues or a combination of issues but i recently got lucky and fixed the bouncy/rough idle on my '08 e92. Sometimes goes away after long (40 mile) trip (idle is fine, check engine light goes out).
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