Turbo whine after intercooler change??

**timbo** · Thursday 6th February 2014, 18:21

So swapped intercooler for larger do88.se one last week, drove 60 miles to work all was fine, drove home(car doesn't move for 4 days) and an annoying whine from the turbo while it's on boost developed??? Checked everything came up with nothing. Put old I/C back on today(to rule out the I/c), whine still there!?!?!?! Seems to be holding boost(according to boost guage) no lambda light! Turbo was rebuilt and balanced 4 months ago, I'm scratching my head here people, anyone had this before? Gonna strip intake down tonight but need the car for work at 4am tomorrow so can't do too much, any advice how I narrow down what this whine is??? Thanks.

**t5 pete** · Thursday 6th February 2014, 19:27

Hey bud are you sure there isnt a air leak any where

**T5RatherAmusin** · Thursday 6th February 2014, 19:32

ye theres prob boost leak somewhere else....

**timbo** · Thursday 6th February 2014, 20:08

I've had a tit full today to be honest but it's gotta be. One somewhere? I spent today looking for one, I've double checked everything I touched! I took air con rad out you don't think that's got anything to do with it do ya?

**t5 pete** · Thursday 6th February 2014, 20:18

Originally Posted by timbo

I've had a tit full today to be honest but it's gotta be. One somewhere? I spent today looking for one, I've double checked everything I touched! I took air con rad out you don't think that's got anything to do with it do ya?

Ide be happy with a tit full, air con wont cause any probs with boost you would be surprised how easy it is to have a boost leak one last thing to check is the hoses coming out of the inlet manifold to see if you have disturbed any thing around there

**AndysR** · Thursday 6th February 2014, 20:32

Also check the elbow hose from the throttle body where the idle control valve pipe joins it, they're common for splitting there and it may have just literally started to leak

**timbo** · Thursday 6th February 2014, 20:52

Haha, cheers guys, yeh I know it'll be something that I've knocked or snapped off! Gutted I can't sort it till I'm next off till next week, was hoping to find a split hose today but nothing

so more staring into the engine bay (once the rain stops!) good to have some advice form ya'll,

Tim

**JamesT5** · Thursday 6th February 2014, 21:19

Vacuum Pipes perhaps?

**smithy** · Thursday 6th February 2014, 22:42

Most boost leaks cannot be seen until on boost mate that's when you hear the sound .so best get a smoke test or stick it a roller if you cannot find the leak .

**timbo** · Sunday 9th February 2014, 02:48

Sorted, throttle body mounting plate onto intake manifold all 4 bolts were 3 or 4 turns loose! So boost was escaping, checked every hose connection at least 4 times over the last week and been under the bonnet every day trying to suss this one out!! Got in engine bay and gave everything the shake test, was baffled as it didn't show a boost dropping off on my guage but as it was so close to TB it wouldn't! Every days a school day, now to get that puny volvo I/C out! Thanks for advice lads!!!