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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
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Your Ride: 316i
316i rough idle when cold
I have a 98' 316i Touring.
After an oil change my car started to idle rough when it's cold. Varies between 500-1100 rpm, and the engine shakes so bad that I can feel it in the coupe and shifter. Also sounds very strange/rough.
However, all these symptomes go away within 30-60 sec, and after that everything is completly normal. Stabilizes at around 900RPM.
Could it have anything to do with the oil change (used syntetic castrol 5w-40 oil, 4 liters, as per instruction book with filter change), or is it just a coincidense?
Thought about a dirty/sticky ICV, but does these symptomes match that? I would think that the symptomes would last longer than 30-60 sec with a sticky/dirty ICV?
ICV is most likely the culprit. my car used to do the same kind of shit. while i was doing the M50 intake manifold swap i took mine out and cleaned the hell out of it and that RPM fluctuation and roughness completely went away. its very simple and i believe theres a DIY writeup for it here on UB, just search for it and if its not on here its on the internet believe me. p.s. - after u do that try running some seafoam through, itll clean out a ton of the carbon buildup and shit in your engine and itll run much smoother. (hint: it says on the can once u pour it in to leave it sit for 5 minutes or whatever. let it sit for hours, the longer the better, trust me on this one
+1 to "215s" thoughts, plus after using SeaFoam change your fuel filter. Seafoam is some powerful cleaner as with any good fuel additive, first HEALTHY dose should closely be followed by a fuel filter change.