hey all,
My 316i (M40 engine) has recently been causing me some stress, it seems (once warmed up obviously) when taking the car from 4k rpm up til redline there seems to be a bit of a hard sounding scratchy kinda noise, hard to describe, quite metallic, doesnt sound very healthy at all. Any ideas as to what this could be? Oil is fine, car is in general good tune, apart from spark plugs (havent changed them yet, but they looked ok last time i checked), so any ideas? doesnt seem to do it below 4k or so, occasionally 3-4 range, and it doesnt seem to matter much, but its more distinct under heavy acceleration...
It also does this under load and also when just free revving..
it still seems to drive how it used to, just now it sounds really bad over 4k, doesnt seem to have lost any power either, just the noise, its really hard as to explain, it almost sounds like when i boot it and it gets going, its kinda like its 'biting' and instead of it being a more throaty sound its much more metallic and whiney-ish..
i hope that somewhere here can shed some light for me!!! Ive also checked drivebelts which were quite slack so i retensioned them and it hasnt fixed the noise...so im stumped..
pleaaase any ideas are much appreciated!
Thanks in advance
Guy
My 316i (M40 engine) has recently been causing me some stress, it seems (once warmed up obviously) when taking the car from 4k rpm up til redline there seems to be a bit of a hard sounding scratchy kinda noise, hard to describe, quite metallic, doesnt sound very healthy at all. Any ideas as to what this could be? Oil is fine, car is in general good tune, apart from spark plugs (havent changed them yet, but they looked ok last time i checked), so any ideas? doesnt seem to do it below 4k or so, occasionally 3-4 range, and it doesnt seem to matter much, but its more distinct under heavy acceleration...
It also does this under load and also when just free revving..
it still seems to drive how it used to, just now it sounds really bad over 4k, doesnt seem to have lost any power either, just the noise, its really hard as to explain, it almost sounds like when i boot it and it gets going, its kinda like its 'biting' and instead of it being a more throaty sound its much more metallic and whiney-ish..
i hope that somewhere here can shed some light for me!!! Ive also checked drivebelts which were quite slack so i retensioned them and it hasnt fixed the noise...so im stumped..
pleaaase any ideas are much appreciated!
Thanks in advance
Guy
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