Dump Valve Help Needed

[gt4WRC]

I have an HKS Sequential Blow Off Valve fitted on the car along with an HKS Air Intake. Everything has been working fine since i bought the car, BUT.....

I was looking at the engine bay and 2 rubber 3/4mm pipes caught my eye as they were hanging loose from the BOV. They have a thin rubber disc on the end of them also, so because there were two, it looked like they should be connected, and guess what.... they push-fit together perfectly.

(when the car is running one of the pipes is sucking air, and the other doesnt seem to do anything!)

But since i connected them the BOV noise is now a louder HISSSS rather than a quieter (butterfly valve) noise.

And on idle the car is struggling and kinda sounds like it wants to cut out.

Please Help Guys...

Thanks.

Ask any questions.

[dawesy]

photos needed to help, but it sounds like you have connected the charcoal canister pipes together.

cant see why this would affect the running but...

it could also be the original DV pipework as this is a split chamber valve, if this is the case remove the two pipes and just run one to your DV.

like i said pics really needed here

[Sketchy]

The disk thing you mentioned sounds like the inline filter that comes with the HKS SSQV.

If you work backwards from the Dump Valve you should have a small pipe coming off the back of the valve like 3mm ID, this will run into the Black disk and then another slightly large ID pipe will run back to a metal connection towards the rear of the engine bay near the distributor. This is the Vaccum line that activates the dump valve when you come off boost.

If the valve was still dumping when this wasn't connected then it probably needs the spring tightening (Should be a small 8mm bolt on the rear next to the pipe connection). The poor running could be due to the dump valve leaking...

I've got one on my car so I'll take some close ups later today if I get a chance and post up for you.

[gt4WRC]

One goes to the back of the BOV

The other heads here somewhere

[gt4WRC]

So by the sounds of it, for the last year the dump valve hasnt been connected properly!! lol. it has been making a butterfly valve kinda noise up to now, (if you know what i mean) is that the standard noise if you have no BOV fitted??

I reset the ECU and the car seems to be running a little smoother now, so no worries.

Cant believe i just noticed the BOV pipes now, after more than a year, and when im thinking of selling too. haha

[Sketchy]

So by the sounds of it, for the last year the dump valve hasnt been connected properly!! lol. it has been making a butterfly valve kinda noise up to now, (if you know what i mean) is that the standard noise if you have no BOV fitted??

I reset the ECU and the car seems to be running a little smoother now, so no worries.

Cant believe i just noticed the BOV pipes now, after more than a year, and when im thinking of selling too. haha

Lol, yea the butterfly noise you've been hearing is Compressor Stall, basically a backup of air pressure when the throttle is close which has nowhere to go until it overcomes the force of the air being pushed in through the turbo and goes back the wrong way...

You can get replacement filter disk things as their not supposed to come apart...

The vaccum line for the dump valve should be just under where you dump vavle is. There one largeish pipe (the idle up connection which should be connected to the filter box or intake pipe if you've got an induction kit) and then one smaller one that is the stock connection for the dump vavle. If it's not connected here just make sure it's blocked off properly or you have a boost leak instead... ;)