Removed acoustic valve help???

[nicholaswilkinson1]

Just done it and all went well. But haven't shut off the pipe that was running to it. So there's a loud sucking noise from behind the wheel arch. So basically does the pipe need shutting off with a bolt or whatever or not?? Cheers

 

[aucky]

Yes.

I cut an inch of the pipe off, screwed a small bolt into it with some silicone, and put it back onto the nipple.

 

[andyc58]

So what does this do by removing it

 

[guysy]

I removed mine and put a bolt in the hose at the wheel end, ive seen some people have a short 3inch length of tube at the throttle body end thats blanked off, is this better or no difference?

when i start the car it idles at around 1200rpm is that normal? I read originally that if the pipe wasnt blocked off it WOULD idle higher than 1000rpm but mine is blanked off.

 

[aucky]

Idle depends on the engine temperature. Hot idle should be lower.
You will probably notice if its out of the ordinary, but yes it will idle high due to in-leakage if not blanked properly.

It won't make a difference which end you blank it off tbh. I just thought it was tidier to do it at the top end.

 

[guysy]

Yeah its fine when hot, i might blank it off at the throttle body end instead.

 

[nicholaswilkinson1]

Just been out with it blocked off, runs like crap, engine nearlly cuts out when doing slow manoeuvres like reversing on drive, unblocked it and it sounded alot better???

 

[aucky]

You've probably got used to the high idle.

Block it up. Unblocked can cause damage from fuelling issues. It's quite close to cylinder 4 iirc? (I havent had an upper inlet for a year)