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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.

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Old 04-02-2006, 08:54 AM   #1 (permalink)
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Stong acceleration is gone... Help...

"Double Vanos

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?

http://forum.e46fanatics.com/showthread.php?t=352589
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Old 04-02-2006, 09:01 AM   #2 (permalink)
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When did you last change your air filter? O2 sensors?
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Old 04-02-2006, 06:06 PM   #3 (permalink)
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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.


http://forum.e46fanatics.com/showthread.php?t=352589

I have posted some images of my plugs after I changed the o2 sensors.

Last edited by abeaujuin; 04-02-2006 at 06:09 PM.
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Old 04-03-2006, 05:23 PM   #4 (permalink)
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Oil seams to be the problem.

I can not believe it. Oil? Mobile 1 5w30 oil caused all of this? You've got to be kidding me.

The power is smooth and consistent throughout the entire RPM range just like before. This must be the vanos I am feeling again. So smooth. I will keep an eye on it, so far Mobile 1 0w40 works.

Thank you Thank You
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