<VV> Even Mo' no hot idle

[BBRT]

Padgett,

You have had a bunch of good advice. Have you carefully checked:

1. Correct engine speed and mixture (idle mixture screw). If running too 
fast you are into the transition slot and fuel will be drawn into throttle 
bore and it will not idle properly.
2.  Carb synchronization.  Improper linkage adjustments (do the carbs 
without crosshaft connected)
3. Vacuum leaks (carb base, line to distributor (?), vacuum hoses to vacuum 
pot, carb bases on forward side of manifold base to crossover metal tube).
4.  Carb vent plugged (silver internal tube sticking up out of body and then 
hole(s) in Bowl cover-top casting.)
5.  Sticking choke valve
6.  Needle & seat (Idle mixture-worn, damaged, or wrong needle-there are 
several different ones used in various carbs).
7.  Venturi cluster (clogged air bleeds, clogged idle tube (jet), different 
clusters with different idle tubes (hole in bottom of tubes are different 
sizes), loose cluster, damaged cluster gasket).
8.  Needle and seat-float (varying float levels affects idle).
9.  Throttle valves-sticking, closed or damaged (upside down? Sides are 
beveled so they close properly).
10. Dirty idle passages.

According to shop manual, the accel pump body cracked or loose on shaft or 
discharge needle (out of round, stuck or damaged seat) can affect idle.

The most likely are #s 1,2,3,6,8,9,10 and all gaskets.

Sometimes taking carbs apart and cleaning them thoroughly even though you 
don't find anything yields correction of the problem.

Unless the carb casting is cracked, IMHO, I don't know of a place for a 
vacuum leak that would affect idle.

Chuck S
BBRT




----- Original Message ----- 
From: "Padgett" <pp2 at 6007.us>
To: <virtualvairs at corvair.org>
Sent: Thursday, September 29, 2005 1:32 PM
Subject: Re: <VV> Mo' no hot idle


> Good friend of mine who has a lot of experience as a general mechanic, 
> service writer, and claims adjuster came over to return a scan tool. His 
> opinion was that one of the carbs has an internal vacuum leak that is 
> preventing a proper idle.
>
> Is there a place on the HV Rochester that is susceptible to this ? Have 
> had a lot of quadrajets apart but no HVs.
>
> Padgett
>
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