Faint whining noise at around 2,000rpm
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Hey guys,
so I've developed a faint whining noise coming from the engine starting from 2,000rpm. With higher rpms, the noise seems to be droned out by the engine (but I'm sure its still there, just can't hear it). It sounds like a supercharger is spooling up, and bugs the hell out of me. I've scheduled a test drive with the shop's foreman, but he said "it might be within parameters". Has anyone experienced this type of noise before? If I pop the hood, the noise seems to be coming from the alternator area. I'm thinking it could be a bearing, or the belt might be to tight. On my last refil, I noticed a 8% decrease in fuel economy, I will keep an eye on this tank.
Any ideas?
When will the problems stop and I will simply enjoy the car?
so I've developed a faint whining noise coming from the engine starting from 2,000rpm. With higher rpms, the noise seems to be droned out by the engine (but I'm sure its still there, just can't hear it). It sounds like a supercharger is spooling up, and bugs the hell out of me. I've scheduled a test drive with the shop's foreman, but he said "it might be within parameters". Has anyone experienced this type of noise before? If I pop the hood, the noise seems to be coming from the alternator area. I'm thinking it could be a bearing, or the belt might be to tight. On my last refil, I noticed a 8% decrease in fuel economy, I will keep an eye on this tank.
Any ideas?
When will the problems stop and I will simply enjoy the car?
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what's your build date? do you know what SW version you have...might be the wastegate, as that was a complaint with the N54 engine...if you are on an older SW version...the "turbo-lag"/wastegate fix SW version 29.2+ addressed this issue....
SW version 33+ addresses both the wastegate rattle and turbo lag complaint....AFAIK
SW version 33+ addresses both the wastegate rattle and turbo lag complaint....AFAIK
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How do you figure out what software version of iDrive is in the car?
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Originally Posted by rkinra' post='834156' date='Apr 2 2009, 10:45 AM
How do you figure out what software version of iDrive is in the car?
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From: Toronto, Ontario, Canada
built date was sometime in June/July 2008. Whats a SW?
The noise doesn't sound like waste gate blowing off, it more of a cosistent whining noise similar to a supercharger.
The noise doesn't sound like waste gate blowing off, it more of a cosistent whining noise similar to a supercharger.
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Yeah you need to read up on all the issues with the N54.
I'm betting it's not the alternator most likely one of the waste gates or a waste gate articulator. Since your car is a June 08 build you are SOL you have MSD 81, and most of the software fixes don't apply to your car. If your car was pre March 08 build there could be some stuff you could do.
The lag fixes don't work with MSD 81, only MSD 80.
You could also have a pinched or kinked vacuum line.
You can only find out which software version at the dealer. But since your build is June 08 you will have some where a round 29.2 or 30.1 , the two most dreaded versions of the software. You can't get it changed to 32.1/2/3 or 33.01 unless bmw deems it's necessary. A MSD 80 would be illegible for the upgrades no questions asked ( almost)
I'm going waste gates , but sounds like you need to go to the dealer. Have you had a HPFP failure yet?
go to e90post.com and the turbo section , you will find a ton of facts on the N54 that will help with some of the more common N54 issues. Look like you will have some heavy reading over the weekend... The lag sticky is over 180 pages long....
Yeah you need to read up on all the issues with the N54.
I'm betting it's not the alternator most likely one of the waste gates or a waste gate articulator. Since your car is a June 08 build you are SOL you have MSD 81, and most of the software fixes don't apply to your car. If your car was pre March 08 build there could be some stuff you could do.
The lag fixes don't work with MSD 81, only MSD 80.
You could also have a pinched or kinked vacuum line.
You can only find out which software version at the dealer. But since your build is June 08 you will have some where a round 29.2 or 30.1 , the two most dreaded versions of the software. You can't get it changed to 32.1/2/3 or 33.01 unless bmw deems it's necessary. A MSD 80 would be illegible for the upgrades no questions asked ( almost)
I'm going waste gates , but sounds like you need to go to the dealer. Have you had a HPFP failure yet?
go to e90post.com and the turbo section , you will find a ton of facts on the N54 that will help with some of the more common N54 issues. Look like you will have some heavy reading over the weekend... The lag sticky is over 180 pages long....
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