Extra Air Valve on right air filter box
#1
Extra Air Valve on right air filter box
Just wonder if the extra air valve on the right side air box is really need. reason for asking is I was detailing (wiping down by hand) the engine compartment getting ready for a car show and noticed it was hot! so I disconnected it and the car ran fine and idled fine.
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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As I recall...a little foggy on the details here....on the earlier cars likes your '84 the EAV (or Supplementary Air Valve in some literature was tied into the 45-second timer for some sort of emission control function. Later cars (maybe '87-later?) the EAV was also tied into the a/c compressor circuit to increase idle speed with the compressor engaged.
So there might not be any reason for you to feel any change in idle speed.
Cheers
DD
So there might not be any reason for you to feel any change in idle speed.
Cheers
DD
Last edited by Doug; 09-15-2017 at 02:44 PM. Reason: missing word
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daverb (09-15-2017)
#3
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daverb (09-15-2017)
#4
#5
#6
No. That is via a little filter, located on the left side of the engine bay (B bank), through hoses, through the dizzy, through a hose to the hose between air filter box and EAV (the wax unit one on the rear end of the B bank). So in theory, it only actually works when the EAV is open (cold).
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rgp (09-20-2017)
#7
l don't believe that to be the case Daim. The dizzy vent hose connects on backplate side of EAV/AAV so would still be subject to air cleaner depression regardless of EAV/AAV status.
Last edited by baxtor; 09-20-2017 at 03:56 AM.
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Greg in France (09-22-2017)
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#8
The vacuum lines for the dizzy works off the AAV on the B bank side which is located on the rear, The EAV is in the A bank side toward the front on the air box/air cleaner box and has nothing to do with the dizzy
#9
There is a "draft" in that AAV elbow at ALL times.
More when cold, for obvious reasons, but the idle speed adjuster limits that draft via the "bleed channel" cast into the AAV housing, when the cold start aperture is closed by the piston.
More when cold, for obvious reasons, but the idle speed adjuster limits that draft via the "bleed channel" cast into the AAV housing, when the cold start aperture is closed by the piston.
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Greg in France (09-22-2017)
#10
The valve on A bank is the supplimentary air valve.
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#11
#12
Your right, I am am wrong, all these, this valve, that valve, you valve my valve, confused yet LOL
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Grant Francis (09-21-2017)
#13
All good Daverb. l wasn't trying to be smart a*** or win a contest. Just that misnomers can take on a life of their own if allowed to and that definately leads to confusion.
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Grant Francis (09-21-2017)
#14
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What we call the AAV is listed as "extra air valve" in the parts catalogs.
The valve in the RH air cleaner is called "supplementary air valve"...as someone mentioned above....in the parts catalogs.
A week's pay says that [at least some of] the confusion in terminology comes from service manuals-vs-parts catalogs, as discrepancies in nomenclature pop up from time-to-time.
I can't swear to it but I think the late 70s vintage service manuals called the B-bank valve "Auxiliary Air Valve" ....and the term just sorta stuck with us.
Cheers
DD
The valve in the RH air cleaner is called "supplementary air valve"...as someone mentioned above....in the parts catalogs.
A week's pay says that [at least some of] the confusion in terminology comes from service manuals-vs-parts catalogs, as discrepancies in nomenclature pop up from time-to-time.
I can't swear to it but I think the late 70s vintage service manuals called the B-bank valve "Auxiliary Air Valve" ....and the term just sorta stuck with us.
Cheers
DD
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