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Message: <blockquote data-quote="godflesh" data-source="post: 4854" data-attributes="member: 2276"><p>Guys + gals,Have been having very slight idling roughness from the car (E36 - 1998 318i). Have just completed a full service [filters(oil,air,fuel)] plugs, ATF, final drive, brakes etc.. Checked gap, ICV, AFM, O2. Mech says, head gasket leaking but I don't believe this. No coolant evaporation, no oil in water and vice versa, no drop in performance when car running, consumption in town at 10-11km/l as usual. The thing is, I noticed sound of air escaping (very short and fast) coming from the left hand side of the car near the adjutser unit whenever I switch off the engine. Happens about 5-6 seconds after switching off the engine. Start car again, idle and switch off and wait for few moments and can hear it again. Sounds like a pop off valve or some sort. Just a blip of air pressure going psssst!.What do you guys (and gals) think?What hoses are in that area that could be the culprit, or is that sound normal??? Could this indicate a leaky/damages/frayed hose???Cheers!</p></blockquote><p></p>