4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Vacum leak?

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Old 08-24-2006, 06:14 PM
  #1  
Valek
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Default Vacum leak?

Will a vacum leak affect idle quality?
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Old 08-24-2006, 06:18 PM
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ackuric
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Default RE: Vacum leak?

yes
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Old 08-24-2006, 06:23 PM
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Default RE: Vacum leak?

I just keep hearing this "sshhh" noise at idle and low rpm aceleration and i dont know what the crap is it. Could it be exhaust then?
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Old 08-24-2006, 07:11 PM
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Default RE: Vacum leak?

hmmmm, have a cai or tb/plenum setup? if so that can be it. check the hoses?
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Old 08-24-2006, 07:12 PM
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Default RE: Vacum leak?

nm i see that you do....that can be the cause..go to your fenderwell and listen there, while its in park
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Old 08-24-2006, 07:28 PM
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Default RE: Vacum leak?

Is around the intake/alternator. Could it be the belt?
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Old 08-24-2006, 07:40 PM
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Default RE: Vacum leak?

hmmm, around the intake itself. have an aftermarket intake?

could be the best, but im sure you would know...
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Old 08-24-2006, 07:43 PM
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Default RE: Vacum leak?

Thats the thing i've never touched the intake
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Old 08-24-2006, 07:44 PM
  #9  
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Default RE: Vacum leak?

But the again the idle is smooth so it cant be vacum, right?
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