Horrid Buzzing Noise.........Ideas Please........
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Horrid Buzzing Noise.........Ideas Please........
Hi, I've just had my MYO2 WRX modified (green filter, decat up pipe, sports cat down pipe, decat centre, wr sport rear box & ecutec remap) by one of the recognised (& highly recommended) scooby specialists.
Although I'm delighted with the increased power & hugely improved overall drivability, I'm less impressed with the horrid buzzing/rasping noise (sounds like a cheap & nasty half muted car horn) that occurs when I accelerate hard in 2nd, 3rd, & 4th gears (not tried 5th) between 4500-6500 rpm - it only stops when I lift off the throttle.
To start with this only happened very occasionally, but it has steadily increased (in less that 700 miles) to the point it does it nearly every time I accelerate hard.............
I've spoken to the 'specialists' concerned & have been told "it's nothing to worry about". But as this is such an annoying noise I'm sorry to say I feel I'm being fobbed off.
Before I start getting heavy, I'd be grateful for any ideas anyone might have about what could be causing the problem.
Although I'm delighted with the increased power & hugely improved overall drivability, I'm less impressed with the horrid buzzing/rasping noise (sounds like a cheap & nasty half muted car horn) that occurs when I accelerate hard in 2nd, 3rd, & 4th gears (not tried 5th) between 4500-6500 rpm - it only stops when I lift off the throttle.
To start with this only happened very occasionally, but it has steadily increased (in less that 700 miles) to the point it does it nearly every time I accelerate hard.............
I've spoken to the 'specialists' concerned & have been told "it's nothing to worry about". But as this is such an annoying noise I'm sorry to say I feel I'm being fobbed off.
Before I start getting heavy, I'd be grateful for any ideas anyone might have about what could be causing the problem.
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From your description, could be gas escaping and causing something to vibrate. My first bet would be to check for blowing gaskets around the up/down-pipe region, or holes/leaks around the intercooler hoses etc.
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Originally Posted by hades
From your description, could be gas escaping and causing something to vibrate. My first bet would be to check for blowing gaskets around the up/down-pipe region, or holes/leaks around the intercooler hoses etc.
I should have said before besides the other items listed, I fitted new samco induction hoses before remap & have checked for leaks on these & the bypass valve since, so pretty sure they're not leaking.
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sounds like an exhaust leak.. the buzzing is the gasket vibrating.. check downpipe to turbo bolts/nuts are tight and also tap the heat shields and check them for damage / tightness as it might be them vibrating.
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Originally Posted by Jolly Green Monster
sounds like an exhaust leak.. the buzzing is the gasket vibrating.. check downpipe to turbo bolts/nuts are tight and also tap the heat shields and check them for damage / tightness as it might be them vibrating.
I think an exhaust leak is a possibility as I'm sure I can hear something blowing from the area of down pipe when the engine is cold. However this seems to go away as soon as it starts to warm up.
I can see I'll have to get my spanners out when the weather improves a bit - not that fond of lying in a pool of ice cold water if I can help it........brrrrrrrrrrrr
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Originally Posted by RRH
this may sound really stupid but could it be the needle on your boost gauge? my defi boost gauge buzzes like a b astard
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Originally Posted by Jolly Green Monster
sounds like an exhaust leak.. the buzzing is the gasket vibrating.. check downpipe to turbo bolts/nuts are tight and also tap the heat shields and check them for damage / tightness as it might be them vibrating.
Having taken the car back to the "specialist" concerned earlier today, I can now confirm you were pretty close.........
It was the gasket at the base of the decat up-pipe that was blowing/resonating.......
It seems the flange on the bottom of the up-pipe wasn't 100% flat/true, so the joint wasn't bolting up evenly.
Thanks again.......
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Originally Posted by hades
From your description, could be gas escaping and causing something to vibrate. My first bet would be to check for blowing gaskets around the up/down-pipe region, or holes/leaks around the intercooler hoses etc.
Thanks for the advice Hades, you was right as well......
Please see above
Thanks again.......
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Big smiles all round..................
Especially as I've got an unadulterated scooby soundtrack to go with the wonderful (& highly useable) power increase.
Just begs the question what were these renowned Subaru "specialists" doing fitting duff parts - hardly the best example of attention to detail, or quality service for that matter!!!!!!!!
Especially as I've got an unadulterated scooby soundtrack to go with the wonderful (& highly useable) power increase.
Just begs the question what were these renowned Subaru "specialists" doing fitting duff parts - hardly the best example of attention to detail, or quality service for that matter!!!!!!!!
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03 September 2000 01:51 PM