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vacuum leak ONLY in open loop?

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Old 08-19-2004, 08:58 PM
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Default vacuum leak ONLY in open loop?

What is under vacuum in open loop that isn't in closed loop?

I can hear a whistle when I start the car, and as soon as it goes into closed loop, it goes away. I have checked all over and can't find the leak.

Any ideas?
Old 08-19-2004, 10:19 PM
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its your air pump commmg on and then going off once the car goes into closed loop
Old 08-19-2004, 10:22 PM
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can I program that out ya think? I deleted EGR when I had the motor out. just not sure what I am looking for on the AIR pump. Is it a vacuum leak then or is it just the noise I should expect?
Old 08-20-2004, 09:24 AM
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Originally Posted by Timberwolf
can I program that out ya think? I deleted EGR when I had the motor out. just not sure what I am looking for on the AIR pump. Is it a vacuum leak then or is it just the noise I should expect?

I get the same EXACT noise, but once the car warms up it goes away, but when it was in open loop before, i didnt think the whistling was this bad, mines pretty loud, i hate it! Also my mileage has dropped off bigtime, i wonder if thats at fault! i cant wait to get money to get an ls6 intake and get rid of egr and air!




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