Suction sound on engine startup - Mustang Evolution

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Old 10-04-2012, 06:03 PM   #1
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Suction sound on engine startup

When I start the motor, I hear this suction sound every now and then. It's really weird. Vacuum leak maybe?
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Old 10-04-2012, 06:23 PM   #2
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All your hoses and intake tube tight?
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Old 10-04-2012, 07:01 PM   #3
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Do you have a cai?...on cold starts I can hear mine through the vents. It may be kinda hard to hear over the exhaust, but here's a vid to see if this is anything like what you're explaining.

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Old 10-04-2012, 07:10 PM   #4
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I didn't notice it before I put the cai on but when it's cold with the iac valve ”choking” the engine you can really hear it..
Just a thought.
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Old 10-04-2012, 09:38 PM   #5
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My CAI makes the same noise. Could still be a leak tho
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Old 10-04-2012, 10:09 PM   #6
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Could be, but a vacuum leak would affect the car much more than just a sound. If the op has performance issues as well I would suspect a leak.
Being that he said on ”start up and sometimes” hopefully it's just what we said.

We'll see what he has to say.
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Old 10-05-2012, 01:02 AM   #7
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Quote:
Originally Posted by XXSTEVEO66
Could be, but a vacuum leak would affect the car much more than just a sound. If the op has performance issues as well I would suspect a leak.
Being that he said on ”start up and sometimes” hopefully it's just what we said.

We'll see what he has to say.
Mine did this once and my CAI got a gap in it letting air through.. I have to push it back in and tighten it back up
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Old 10-05-2012, 12:14 PM   #8
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I tried searching for leaks anywhere and I can't seem to find one. Coup it be a problem with the iac? Mine was acting up a couple months ago
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Old 10-05-2012, 04:11 PM   #9
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What year is your car?
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Old 10-05-2012, 07:04 PM   #10
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Quote:
Originally Posted by austinknoll
I tried searching for leaks anywhere and I can't seem to find one. Coup it be a problem with the iac? Mine was acting up a couple months ago
Use a can of ether or carb clean and spray around the: intake, injectors, vacuum lines, eve, etc etc etc. If the car isles up then you found the leak. Just Becareful of electrical connection.
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