Buying an S2 Coupe - Am I walking into a world of pain.

[newsh]

So if I put a vacuum on the small pipe on the DV should it hold? As at the moment it does not hold any vacuum. I've also tried to push the valve in and hold my finger over the small pipe and as soon as you let go of the valve it just springs straight back,

Yes it should hold, the diaphragm is split and that accounts for your strange whooshy chav noise.

[B5NUT]

So if I put a vacuum on the small pipe on the DV should it hold? As at the moment it does not hold any vacuum. I've also tried to push the valve in and hold my finger over the small pipe and as soon as you let go of the valve it just springs straight back,

[newsh]

I could not see any after market valve in the system, I've currently got the air filter housing and all I can see is the OEM one. I'm going to remove the front bumper and have another look around.

Did you try pulling a vacuum on the DV? Just pull the wee vac pipe off the front of the Inlet manifold and suck on it, (or use a mightyvac to avoid oily mouth lol).

You will definitely need to do a proper boost leak test. There’s a definitive thread on here about it but basically you pressurise the intake system from the MAF hose, it should hold about 1 Bar and leak down slowly past the rings and the turbo oil seals. You need a plug to fit the large end of the maf hose with a tyre valve in it. You can pressurise higher if you disconnect the PCV system from the maf hose.

[B5NUT]

I could not see any after market valve in the system, I've currently got the air filter housing and all I can see is the OEM one. I'm going to remove the front bumper and have another look around.

[Rikki Kitto]

Another item on my to do list could be to track down a boost leak. Almost every time I went to change gear you you could hear boost escaping, kind of like a chavi dump valve. Now my dump valve is standard (from the external look of it), but the vacuum pipe was very lose and just pulled off with ease. Now I don't believe that is was where the sound was coming from so anyone know where the most common place to find a boost leak, and why would I get it when I was changing gear?

Might have a Forge dump / recirc type valve they give you the woosh without affecting the running of the car, boost leaks are a nightmare to trace could be anywhere bud

[newsh]

We fitted a panel K&N into our S2 ‘back in the day’ and it gummed up the MAF in about a month of normal driving. It was about the time several people on here saw a similar issue so we reverted to paper and gave the MAF an industrial alcohol bath. It might have been an ‘era’ issue but it put us off.

Hence the invention of the “MAF BAF”

[Ian Simmonds]

Great, the paper filter is perfectly adequate, I use one on my 400 hp car, although it’s in an RS2 airbox which flows a bit better.

People are weird with K&N filters, they don’t check them, I pulled one out of a bike that was threadbare, basically doing nothing, at least with a paper one, ok they get dirty and block up but they don’t stop filtering the air.

We fitted a panel K&N into our S2 ‘back in the day’ and it gummed up the MAF in about a month of normal driving. It was about the time several people on here saw a similar issue so we reverted to paper and gave the MAF an industrial alcohol bath. It might have been an ‘era’ issue but it put us off.

[newsh]

It's a stock paper filter. Did have a K&N panel filter and I ripped that out, as it had never been cleaned since it was fitted back in 2008 Will get the DV removed in the morning.

Great, the paper filter is perfectly adequate, I use one on my 400 hp car, although it’s in an RS2 airbox which flows a bit better.

People are weird with K&N filters, they don’t check them, I pulled one out of a bike that was threadbare, basically doing nothing, at least with a paper one, ok they get dirty and block up but they don’t stop filtering the air.

[B5NUT]

It's a stock paper filter. Did have a K&N panel filter and I ripped that out, as it had never been cleaned since it was fitted back in 2008 Will get the DV removed in the morning.

[newsh]

Another item on my to do list could be to track down a boost leak. Almost every time I went to change gear you you could hear boost escaping, kind of like a chavi dump valve. Now my dump valve is standard (from the external look of it), but the vacuum pipe was very lose and just pulled off with ease. Now I don't believe that is was where the sound was coming from so anyone know where the most common place to find a boost leak, and why would I get it when I was changing gear?

Could be the diaphragm in the DV is split, you should be able to hold vacuum on the actuator line. An actual boost leak will woosh or whistle as the boost builds, not as you change gear.

The DV is actually a Diverter Valve in the stock configuration as it doesn’t dump, it diverts manifold pressure back to the face of the turbo.

The plastic DV often rests on the back of the headlight surround and can rub through, I’ve seen plenty of these with a hole in them. Worth checking.

Does the car have the stock airbox with the stock paper filter? Cone filters sound noisy..

[B5NUT]

Another item on my to do list could be to track down a boost leak. Almost every time I went to change gear you you could hear boost escaping, kind of like a chavi dump valve. Now my dump valve is standard (from the external look of it), but the vacuum pipe was very lose and just pulled off with ease. Now I don't believe that is was where the sound was coming from so anyone know where the most common place to find a boost leak, and why would I get it when I was changing gear?

[B5NUT]

Yes, I need a new one along with a 450nm torque wrench, big **** stilsons + any other tool this car needs.

[Bowie69]

Time for a BFH.....

I have a 20t press for this sort of thing, not beaten it yet, but sure there will be something at some point.

[B5NUT]

No circlips, I remove all of the rust around the edge of the wheel bearing housing, so the bearing would not have to pass a thick rim of rust, but even with that and a mapp torch for heat and 8ton of pressure it still did not budge..

[Bowie69]

Some wheel bearings have circlips -do check....