Odd noise when coming on boost...

[Rusty]

Been noticing a ticking then screaming noise when the car's coming on boost; it's intrermittent and is more prominent when cold and then goes away when the car is warm. I decided to do some investigation and typically, I've made it worse

I'm hoping that it's an exhaust gasket - the car's sounded a bit throaty on tickover for a while and revving the engine does make the exhaust sound as though it's leaking somewhat. I haven't got totally in-depth with it yet, as I've got a new turbo on the way, so I can sort it then.

Other options are a cracked exhaust manifold and knackered turbo!

Hopefully, it's nothing too serious and is just a result of age and some recent chip-testing :mischeif:

Any suggestions welcome...

[driftin jo]

Yes, small cracks in the exhaust manifold will do that , when hot the crack is sealed and the noise stops because of expansion . I had a manifold on my 200 that did this for years.

[Error404]

turbo gaskets make a proper screech when they let go

[Rusty]

Cool, sounds like it's the manifold or the gasket then. Will have a good poke about...

[newsh]

URs do this, usually the EM gasket. If its screeching probably the DP or WG gasket.

[Rusty]

Just to tie this thread up, I thought I'd post up the findings of some playig today.

Basically, the problem was rather simple to spot - the EM studs on cylinder 5 had come lose and were undone, leaving 1/8-1/4" gap between the washer and the EM outer face! I tightened them up, checked everything else I could get my hands on and it's all fixed! Still sounds throaty but then it has, since fitting the 3" DP 2.5 years ago.

Will take the oportunity to check the rest of it when I get the recon turbo on soon.

[s2driveruk]

nice easy fix..makes a change on these

[newsh]

[urS6Tom]

Basically, the problem was rather simple to spot - the EM studs on cylinder 5 had come lose and were undone, leaving 1/8-1/4" gap between the washer and the EM outer face!

Which manifold do you have? A similar thing happened on my RS2 EM a couple of weeks ago. Noticed a strange exhaust sound on startup, opened the bonnet to find the top nuts on cylinders 1 and 5 were missing and most of the top row were fingertight

Got some replacement nuts & washers from Pete at QC and tightened them up as best I could (pretty sure you could never get a torque wrench on them).

My only worry is that some of the EM nuts that are out of sight (underneath) may have loosened/fallen off too - not much I can do about though.

[newsh]

Take the headlight out and have a look.

[urS6Tom]

Take the headlight out and have a look.

Thanks - wouldn't have thought of that!

Does that apply to the S6 as well as the S2?

[newsh]

Thanks - wouldn't have thought of that!

Does that apply to the S6 as well as the S2?

TBH I'm not sure but it only takes a few minutes to find out

Having just bolted the EM back on my coupe yesterday I can tell you that you can reach all the lower bolts from the front of the car except the back one or 2 which you need to reach round behind. I don't have the bumper or IC on it at the mo though ..

[Rusty]

I'm going to be working around that area again soon, so I'll make sure I check it all out then