3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Hi - I have a 318i. When I take my foot of the accelerator, the revs drop easily to about 1200 then rise slightly and then over about 5 seconds, slowly drop down to where it should be at about 800. Has anyone any idea what the cause might be?
I would start with looking for a vacuum leak, it's the easiest, simplest and cheapest place to start. This could be anything from a loose intake boot at the throttle body to a leaking vacuum hose under the intake or even a failing crank case vent valve.
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