hello everybody, I am looking for some help please my car is a 2001 330ci convertible my car is making a knocking/tapping sound at idle and when revving the car and driving. Basically the car has had this noise ever since I got it which was about a year and four months I feel like recently it has gotten worse.. the noise occurs at idle as you can hear in the video, and when I rev the car at a standstill and while driving when revving the car the noise is immediately there all the way up until about 3K revs when driving, the noise occurs more in first, and second and third and comes on when the revs are at about 2000 before 2000 It is really quiet and normal, but if I put the car in manual mode and drive in second once I start getting to 2000 revs, the noise comes and you can hear the rattle that you hear in the video , the noise is there till just over 3k rpm. I have done lots of work on the car such as new Disa valve, new camshaft position Sensor, the Vanos seals and rattle rings, new purge valve, services multiple times , new spark plugs and lots more done to the car. Any help would be massively appreciated thank you very much.. link to the video of my car below:
330ci engine problems knocking sound
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Thank you for your reply I appreciate it, it’s recently been getting worse but only really at idle, it’s started knocking more on idle than what it done at first, I’ve just been putting it down to Vanos rattle, but since doing that nothing got better, engine only has 77k miles and good compression on all cylinders, I’ve always kept on top of oil and changed every 4-5k.
I’d also like to add I’ve put over 10k miles on the car with it making this noise, I mean it’s got worse on idle recently like I said but In terms of revving the car while at a standstill and if I steady accelerate in 1st/2nd/3rd the rattle comes on around 2k rpm, the car has been doing that ever since I got it, and since then over 10k miles have been put on it, the reason I’ve not done anything about it is because 1. I put it down to Vanos rattle 2. The car drives perfectly fine plenty of power there accelerates just how it should I also mainly drive it in drive and when In drive you very rarely hear it it’s only really when I put it in manual mode to drive it harder that I start to notice and hear the noise, again thank you for you help I will take it to my mechanic, has anyone else got an opinion on what this sounds like, thank you.
Okay thank you both of you, I appreciate it, how would I go about fixing this then what parts do I need is it rod bearings, is it a hard job to do? I know it involves taking the oil pan off etc.. how much would it cost diy and would this have damaged any other components in the car?
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I've done it with the engine out of the car. Then it's very easy. Ofcourse taking the engine out is overkill for this job. IIRC it should be --> support engine from top, remove subframe, remove oil pan, and then you can get to work. It's a dirty job and not something you do in half an hour. If you DIY, take your time. Parts needed: new bearing shells, new rod bolts (don't reuse the old ones), new oil pan gasket. If you DIY it will take some time and work but it won't cost you a lot.
That is in case your crank is still intact. If it isn't, you're probably in for a lot more ££.
That is in case your crank is still intact. If it isn't, you're probably in for a lot more ££.
Thank you mega for the information that was really useful I will look into getting the parts to do the job. Also to mega and RRR how do I know if the crank is okay how would I tell that and what do you mean by you would want to find cause? Thank you for your help
Ah okay I understand now thanks, yeah exactly me too I’m baffled I’ve always kept up with the oil etc and never drive the car hard when cold always make sure oil temp is fully warm etc.. okay thanks I will do, what’s the chances the engines toast or do you think it’ll be okay? Thank you
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what oil did you use? I've seen some unexplainable engine wear from people claiming "I change my oil every 5000 km" which imo is completely ridiculous, but meanwhile they used 10W40 instead of 5W30, because they thought it was fine to use cheaper oil because they do change it more often.
I use a 5w40 fully syn triple qx oil that fully meets the specs for my car, and do you think it’s overkill to change every 5k? Although in my case it may have done me some good incase anything was floating about in my oil, although I always check the oil filter and haven’t noticed any metal etc… and yeah I’ll have to check oil pressure probably easier for my mechanic as I haven’t got a gauge for that.
I’m baffled because it’s made this noise ever since I got it nearly a year and a half ago, it’s gotten worse at idle but while revving and driving it hasn’t seemed to have gotten any worse, i feel and sound really stupid I’ve let it go this wrong I just put it down to Vanos rattle as I’ve read is really common problem with these cars, its only recently I put rattle rings in the Vanos and it hasn’t done anything has made me now sort this problem. I would’ve thought the engine would’ve completely broke by this point as I thought rod knock is really bad and to not leave it alone long or the engine will be toast.
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If it is in fact rod knock, it's a terrible idea to keep driving it. I wouldn't even let it idle for 5 minutes.
yes
Exactly and that’s what baffles me because it’s done this for over a year now surely with rod knock it would’ve blown up by now 10k+ miles doing this.
Run with the belts off for a few seconds just to make sure it’s not belt related.
Your rod knock (if it is that) started before you got the car, no matter how nicely you drove and took care of it once it starts it will just get worse. I assume either last owner drove it very hard or starved it of oil somehow.
Your rod knock (if it is that) started before you got the car, no matter how nicely you drove and took care of it once it starts it will just get worse. I assume either last owner drove it very hard or starved it of oil somehow.
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