AAV testing, Manual and electric |
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AAV testing, Manual and electric |
malcolm2 |
Feb 20 2017, 05:59 PM
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#1
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
Ok. I have had the AAV off for a couple weeks now. I figured it was time to re-install. Wanted to test it first.
I put it in the freezer. The valve was open before and after. I got the wife hair dryer out and got it hot enough to NOT hold on to. But the valve stayed open. I got my drill battery out and jumped it to the connector. Very quickly the valve closed. I decided to blow threw it. Air did not move quickly thru it, but i could hear the hissing as it came out. So the question is: is the AAV supposed to close up tight? |
timothy_nd28 |
Feb 21 2017, 10:31 AM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
The aux air valve should fully close or at the very least close to a tiny leak consistently every time. If this tiny leak is consistent every time, you can tune the idle.
If the AAV happens to close fully one time but closes to a pin hole the next time, you will have a very erratic idle. Using a hair drier as a test will prove nothing unless you are making a excel graph on closing times in relation to different temperatures (be sure to label the units clearly this time (IMG:style_emoticons/default/biggrin.gif) ). Outdoor ambient air temperature will never cause the AAV to fully close. The dual relay supplies +12 volts as soon as your engine is running, while the ECU supplies the ground. With that said, the AAV is closing immediately when the engine first starts. The case temperature of the AAV will determine just how fast it will close. On a cold day, it will take a little longer for the AAV to close versus a hot summer day. This is what you want, as you don't need a fast idle for very long on a hot summer day. This AAV is not a special part only used on our 914's. They are used in a ton of different cars, google 1995 infiniti idle air control valve. This is very similar to what we use, perhaps its a better design? Our car is extremely finicky to vacuum leaks, and I have found in the past that the AAV was a source of a vacuum leak thru the electrical connector. You can try cleaning the insides or even try adjusting, but this seems to be a very common part, why not just buy it new? |
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