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How do i find a vacuum leak? 

 

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 Post subject: How do i find a vacuum leak?
Posted: Mon Jun 13, 2005 4:38 pm 
Tyre Shredder
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I have problems with my car idling for months now - and yes i have replaced and checked everything at much expense.
I think it must be a vacuum leak - i can sometimes hear a slight whistle sound when i let my foot back on the throttle - like when going down a hill or rolling up to the lights. I am not sure if this sound relates to the vacuum leak or not.

The question is - how do i find where the leak is coming from?

My car is an ef xr6 manual.
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Posted: Mon Jun 13, 2005 4:42 pm 
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spray the intake manifold with carby clean to find where it is! :)

 

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Posted: Mon Jun 13, 2005 4:45 pm 
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fill your engine bay up with selleys no more gaps!!!

 

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Posted: Mon Jun 13, 2005 9:12 pm 
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Happy wrote:
fill your engine bay up with selleys no more gaps!!!


Haha. There's always one clown in the group. :roll:

 

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Posted: Mon Jun 13, 2005 9:17 pm 
Tyre Shredder
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Sensible answers only please - this vacuum leak has cost me over $600 in changing parts but with not sucess. The time for jokes is over - I am going to sell the falcon if i cant fix it soon. Wonder if i can get a good trade in on an x pursuit VN commodore. Should be able to get a VT style body kit to suit with the change!
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Posted: Mon Jun 13, 2005 9:21 pm 
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as i said - spray carby-clean on the intake manifold!

 

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Posted: Mon Jun 13, 2005 9:31 pm 
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any flamable spary will work jus spray it on sections at a time if ur engine picks up it means its got a vacuum leak.

 

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Posted: Mon Jun 13, 2005 10:22 pm 
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wat have u changed? if could be as easy as u have left a vacuum hose off somewhere

but yea, just spray carby cleaner all over the intake and listen for a rise is revs or just the carby cleaner being sucked in

thats the easiest way

 

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Posted: Mon Jun 13, 2005 10:31 pm 
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A hose to ear and suspect area's is another way...
Like Dr's stephoscope [sp]?

 

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Posted: Tue Jun 14, 2005 12:18 am 
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also, try spraying a water/deturgent mix.

 

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Posted: Tue Jun 14, 2005 4:22 pm 
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I was gunna say use detergent /water mix.... um, a bit more safe than `spray any flammable liquid....' All you want is to momentarily block the leak ( whichh the detergent spray will do) and you will hear the revs rise or maybe a temporary end to the vaccum leak noise... the idea is to pinpoint it down then maybe try some sealant to try and eliminate it...

 

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Posted: Tue Jun 14, 2005 4:44 pm 
Tyre Shredder
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Thanks all - i will give it a go tonight.
I am not sure whether it is related or not but this morning when i went to drive the car the brake booster was not working. I am assuming it was the brake booster as the pedal felt like a rock - like when the engine is not running.

Is it possible that there was/is some kind of leak between the manifold and the booster?
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Posted: Tue Jun 14, 2005 6:42 pm 
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lol, I was just about to say its your brake booster. Take the hose off the brake booster, and shove a bolt in it, try again... if it idles there you go.

Mate of mine had the same problem. The diaphram on those things goes, and then its a leak.


Cheers

 

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Posted: Tue Jun 14, 2005 6:45 pm 
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Yeh, when the booster went on my waggin, she actually started to idle a little more sensibly! (vac leak) :D

 

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Posted: Tue Jun 14, 2005 6:46 pm 
Tyre Shredder
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THanks for the booster advice - i will giove it a go tonight.

Any suggestions on fixing the booster? When you say the diaphram goes are you suggesting i will probably need a new booster?
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