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Old 27th February 2010, 05:33   #1
russap5
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How loud is your secondary air pump?

My SAP sounds like a plane engine on the tarmac! I read on another forum that the louder it gets the closer it is to SAP heaven. Apparently it should sound like a small vacuum and barely be audible from inside the car. How loud is yours??

For those wondering what the SAP is, its the air pump that you can hear for 90 - 120 seconds on a cold start for emissions control.
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Old 27th February 2010, 05:54   #2
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Quote:
Originally Posted by russap5 View Post
My SAP sounds like a plane engine on the tarmac! I read on another forum that the louder it gets the closer it is to SAP heaven. Apparently it should sound like a small vacuum and barely be audible from inside the car. How loud is yours??

For those wondering what the SAP is, its the air pump that you can hear for 90 - 120 seconds on a cold start for emissions control.
So what exactly does it do and what happens if it does go to SAP Heaven...Any damage to the car if it goes out?

That may be the cause of the screaming sound I get on cold startup for about the first 120 seconds. Once the car is fully warmed up and I have driven it for a while it doesnt come back on the following startups.
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Old 27th February 2010, 05:55   #3
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Mine's barely audible inside the car. If standing outside, it can be discerned over the engine sound - but it's not too loud at all. 82k on the odo...
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Old 27th February 2010, 06:08   #4
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Quote:
Originally Posted by cknaak View Post
So what exactly does it do and what happens if it does go to SAP Heaven...Any damage to the car if it goes out?

That may be the cause of the screaming sound I get on cold startup for about the first 120 seconds. Once the car is fully warmed up and I have driven it for a while it doesnt come back on the following startups.
The secondary air pump is just for cold start emissions. If it were to fail, it would just stop working and you would get a check engine light for low air output from secondary air pump. It wouldn't affect the way the car runs.

Mine is pretty loud when I stand outside on a cold morning, but I don't hear it inside the car over the engine.
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Old 27th February 2010, 07:22   #5
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I think you will be more susceptible to carbon buildup if your SAP stop working and you do not replace it. The secondary air system is responsible for carbon buildup and it would probably be best to replace it. Mine isn't loud enough to make me replace it yet, but I have heard people having to replace theirs every year or so.
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Old 27th February 2010, 07:41   #6
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Check out this video I posted last week. The more and more we talk about it, the more and more it sounds like the SAP going out.

What is causing this sound? **Video**
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Old 27th February 2010, 07:44   #7
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Mine sounded like a wailing wounded animal before I ripped it out and installed my ESS kit. Was very loud even inside the car with the windows rolled up.

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Old 27th February 2010, 07:47   #8
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Quote:
Originally Posted by cknaak View Post
Check out this video I posted last week. The more and more we talk about it, the more and more it sounds like the SAP going out.

What is causing this sound? **Video**
Yea I posted in your thread that is was the SAP. It should be replaced if not because it is dying, but because it is loud and annoying
I posted this picture of it too..

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Old 27th February 2010, 07:50   #9
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Quote:
Originally Posted by herrubermensch View Post
Mine sounded like a wailing wounded animal before I ripped it out and installed my ESS kit. Was very loud even inside the car with the windows rolled up.

--Peter
How does the ESS S/C kit compensate for the secondary air system? Does it force enough extra air in even at cold start to burn up the extra fuel emissions?
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Old 27th February 2010, 07:52   #10
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Secondary air costs about 8k to replace with no guarantee it won't return. It doesn't affect performance so you would be better off going with a software fix from Powerchip or Ess.
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