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Are these possible sources of vacuum leaks?; Pics provided
Topic Started: Sep 12 2011, 01:55 PM (744 Views)
Norby
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I'm working on my '92 Metro, trying to get the idle right. Please see the arrows in my pics. Do I need to plug those 2 places?

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Stiffchezze
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Sir Metrologist

I don't think they go anywhere. Just leftovers from casting. Do you have any reason to believe they do?
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Norby
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Well, couldn't tell just exactly if they are closed, or just filled with crud. I spray the areas with Brake Clean and there is no change in idle. But...just suspicious of those areas that I mention above.

If I plug in the IAC, the idle speed increases to about 1500-2000 rpms. And the idle speed screw is all the way in. I think my next step will be to remove the throttle body and clean it real well, and install new gaskets.
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MEgaTRO
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autobot

all new gaskets are a good idea. but upon putting it back together i would set the idle according to the repair manual. Just screwing the screw in or out is just going to throw it off of base idle further. Once base idle is determined your high idle could be coming from many possible problems that are being hidden by your idle screw. I would check timing, compression, and it could even be something weird like your ecu thinks the ac is on etc. but spraying a flamable liquid around a possible leak is the cheapest and most convenient way to check for leaks and also the most fun/dangerous imo. Soapy water is a good alternative but careful.. too much of anything is bad

Good luck!
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snowfish
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Basic GearHead

Norby
Sep 12 2011, 02:42 PM
If I plug in the IAC, the idle speed increases to about 1500-2000 rpms.
You mean the electrical connection, right?

If so, the the computer is holding the IAC open. The IAC is just a controlled vacuum leak.

As far as I know, the sensors that the ECU gathers information from to govern the IAC, is Coolant temp, Intake Temp, & TPS.
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