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.
Double VANOS allows the engine to "steplessly" choose valve timing for both intake and exhaust camshafts. Electronically controlled in response to engine speed, load and temperature, Double VANOS maximizes engine response, efficiency and emission control. The benefit: more low- to medium-speed torque for strong acceleration and added flexibility for better highway performance, plus quieter, smoother engine at idle."
I used to be able to pass cars without having to down shift or rev the engine much. The power was there the harder I stepped on the gas pedal. I am beginning to wonder if it's the Vanos seal issue that many people have experienced.
I have been posting this issue here, but no luck in finding a solution. Can someone please help?
I changed the Air filter and nothing, but when I changed out the 2 pre-cat o2 sensors, the car felt great and the power lasted through the entire RPM range. Double Vanos was feeling really good, but it only lasted for about 1 week. then it disappeared.
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