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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 09-15-2011, 02:39 PM   #1 (permalink)
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2002 320i knocking upon take off

I have an aut trans, 320i 2002, when I am idling and take off it will make a knoking noise, if I take off gas it will decrease and when 3rd gear enters it will disapear and run normal, note that this does not happen durin shift down.
Please help
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Old 09-15-2011, 03:12 PM   #2 (permalink)
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simple try adding some transmission Fluid if that doesnt help take it to a repair shop cause sounds like your tranny might be slipping. If it is then you need to get it replaced.
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Old 09-15-2011, 03:19 PM   #3 (permalink)
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the knocking sound happens when I take off fast or half speed, if I take off moderatly it will not happen or it will be very light. if it is the tranny, can it be repaired with out major overhaul or replacment
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Old 09-15-2011, 03:31 PM   #4 (permalink)
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that really depends on once they open it up and see what condition the gears are in but in most cases if they are going to have it open you might as well just replace them and that can be costly. There are some shops out there that repair them but more than likely you will be in the the shop again at or over a year. I would suggest finding a good shop to crack the case open and see how bad it is.

Im not a mechanic by far but I have replaced a few trannies in my street racing days.
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Old 09-15-2011, 03:35 PM   #5 (permalink)
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Hey thanks, I really thank you for your time and help
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Old 09-16-2011, 03:08 PM   #6 (permalink)
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I don't think it is the box itself... Is it an engine knock or suspension knock?
If engine, then it could be one or more of many things like Crank-bearings shot, CPS or even lifters!
Just a thought buddy...
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Old 09-16-2011, 03:14 PM   #7 (permalink)
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Yah, I'm not an expert but loss of power at start seemed to me gears.
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Old 09-16-2011, 03:18 PM   #8 (permalink)
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Could be Cam Position Sensor (this would cause a knock and symptoms of no power)
... But, has the MAF been cleaned recently?
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Old 09-16-2011, 03:24 PM   #9 (permalink)
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Yah that seems another likely cause cam or what about pistons?
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Old 09-16-2011, 03:27 PM   #10 (permalink)
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last night I drove it in the autostick manual position and discovered that the knocking sound was much softer, and when I shifted through 2nd gear faster you could hardly feel the knocking sound. Really strange
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Old 09-16-2011, 03:39 PM   #11 (permalink)
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When was the gearbox oil/filter last changed?
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Old 09-16-2011, 05:57 PM   #12 (permalink)
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good point, I really dont know. thanks for the advise
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