A good way to test for induction leaks is to spray WD40 around the gasket area's, and where the plenum joins the manifold.

If there is a leak, the revs will rise when you spray WD40 at the leak, cause the WD will enter the intake. My XC used to always blow manifold gaskets, this method was a good way to confirm this.

A good way to test for induction leaks is to spray WD40 around the gasket area's, and where the plenum joins the manifold.

If there is a leak, the revs will rise when you spray WD40 at the leak, cause the WD will enter the intake. My XC used to always blow manifold gaskets, this method was a good way to confirm this.

Yeah I used carby cleaner to test for leaks.....no leak though.

Did you check if the surface of the plenum was intake, as I told you RIP85 had a issue with the paint

cracking and causing a leak, he removed the paint on the sealing surface and it was solved.

Maybe contact him so he can tell you more of his experience.

still waiting on some finishing bits for my new TO4z, so havn't had much to email you on.

did you check out the tune I gave you. how did it go if you tried it.

just email if you have anything in reply.

Interesting! exarhsix is your processor code A3YB? You have very similar mods to me so if it is indeed induction noise then a solution maybe in the throttle settings?

Sorry mate, you lost me there. Where do I find my processor code?

Interesting point you make re: the throttle settings. I'm not sure if you would be able to tune it out but? Hmmm......

I wonder if Alex or Oyay could shed any light? (They aren't round here much these days but...)

Definitely not a leak but. I had a leak in mine when I installed it, because the gasket sealer I used was too thin. It blew out straight away and made this awesome screeching noise as the air rushed through the gap. Had to take it all off again, clean it all up and install it with new sealer. Did the WD40 trick too to make sure it was all good.

Edited May 21, 200917 yr by exarsixturbo

Look on your computer / PCM (passenger side of the computer) under the bonnet and there should be a white strip attached and some writting is on there. You're looking for a 4 number/letter code.

The noise only occurs when I stab the throttle hard, if I stay on the gas there is no noise. I'm quite certain it isn't a leak.

I will try and contact Alex and ask if he has ever come across this noise. 01txr has some ideas with the pcm calibrations so I will have a play on the weekend and see if I can tune around it if it is an induction noise.

Ahh right, yeah I know the white tag... Just out of curiosity, what will having my code tell you?

Good luck with it on the weekend. Definitely let me know what the outcome is, I will be interested to see if you can "tune it" out.

Ahh right, yeah I know the white tag... Just out of curiosity, what will having my code tell you?

Good luck with it on the weekend. Definitely let me know what the outcome is, I will be interested to see if you can "tune it" out.

Different processor codes have different factory calibrations. Yours should be A3YB but if not I'll run a comparission check between our factory tunes. I'll see if there any differences that could shed some light. Otherwise I will have a play but I doubt I'll be able to fix it.

No luck so far! It's going on the dyno Sat morning......maybe make or break lol.

my car does this exact thing on occasion. once or twice randomly, then goes away for months. I always thought it was the drive belts maybe bit wet or somethin.

No luck so far! It's going on the dyno Sat morning......maybe make or break lol.

Well noise is still there and no development on that front. The plenum does make a huge difference on the dyno and a worthy investment!