Re: [Chrysler300] 413 stuttering update

[Steve Albu <saforwardlook@xxxxxxxxx>]

I second this opinion.  In both AVS and AFB carburetors, the idle and low
speed circuits can gum up easily, especially with ethanol fuel now.  The AVS
carburetors are actually worse since their passages are even smaller than in
the AFB clusters.  The only way to get them clean that I know of is to
remove the clusters in the primary circuit and use some carburetor cleaner
in a spray can and a very thin wire that will go through the small
holes/tubes in those clusters to be sure they are clean.  When the carb
spray goes through them at a good rate, you know they are clean.  Just
dipping these clusters in typical carburetor cleaner doesn't do the job,
which is what most people tend to rely on.  I started doing this additional
operation on all my carb rebuilds, and the results are night and day.  Mike
is right.
Steve Albu

On Sat, Jul 16, 2011 at 11:50 PM, Michael Moore <mmoore8425@xxxxxxx> wrote:

> Doug,
> I had exactly that problem with a set of AFBs on my 300H. It was dangerous
> because it would almost die at stoplights when I hit the gas.
> The Corvette guys know a lot about AFBs so I got on their site and
> severalsaid the same thing: that the idle circuits n the AFB  gum up pretty
> often and are very sensitive.
>
> I took my carbs to a top carb shop here in San Jose, had THEM clean and
> rebuild them. It made all the difference in the world.Problem solved.
>
> Mike Moore
> 300H
> On Jul 16, 2011, at 4:20 PM, 2HsandaHeritage@xxxxxxxxxxx wrote:
>
>
>
>
>
> I moved the the link up to the top hole to get the maximum accelerator pump
> shot arm stroke.
>
> This resulted in at least a 50% reduction to the stuttering problem.
>
> I now get 2 strong shots of fuel.
>
> I am wondering if I also have a vacuum problem.
>
> With the car idling and in neutral, I hear a loud high pitched "squeal"
> when I depress the power bake petal.
>
> Could this be a problem with the recently rebuilt booster?
> (The hose from the intake manifold to the booster looks new).
>
>
>
> Doug Warrener
>
>
>
> ----- Original Message -----
>
> From: "Steve Albu" <saforwardlook@xxxxxxxxx>
> To: 2HsandaHeritage@xxxxxxxxxxx
> Cc: "Chrysler 300 Club International" <Chrysler300@xxxxxxxxxxxxxxx>
> Sent: Thursday, July 14, 2011 10:22:59 AM
> Subject: Re: [Chrysler300] 413 stuttering
>
> A couple things to look for Doug.
> Usually a stutter as you are describing is due to a non-existant
> accelerator
> pump shot of fuel or at least a weak one.  With the engine off, and the air
>
> cleaner off, look down into the throat of the carburetor while moving the
> throttle and look for two squirts of fuel.  This will tell you how strong
> the pump shot is under varying rates of throttle opening.  Hopefully the
> rebuilder put in a new pump plunger with a good leather seal on it.  You
> might want to check the adjustment of the pump shot arm to make sure you
> are
> getting the maximum stroke as well.  There are three choices of holes to
> place the link into.  Also, be sure that there is a check ball (it could be
>
> a check rod too, rather than a ball)  below the pump squirters, as a
> missing
> check ball or will result in little if any pump shot.
> One other reality today is that with ethanol in the fuel, if the car sits
> long periods of time between driving events, it may be that the check ball
> is stuck since after several cycles of heating/cooling with ethanol laced
> fuel (even 10%), a gummy residue will build up and the check will not move,
>
> resulting in no pump shot and difficulty starting the car without putting
> fuel directly into the intake manifold.  The only way to remedy this is to
> put carburetor cleaner into the check ball area to free it up.  This
> involves removing the top of the carburetor each time, which is a pain.
> Ethanol laced gasoline is an annoying problem for our older cars.  Maybe
> someone has found a gasoline additive that minimizes the gum build up, but
> I
> am not aware of one that works yet.
> Steve Albu
>
> On Thu, Jul 14, 2011 at 10:03 AM, <2HsandaHeritage@xxxxxxxxxxx> wrote:
>
> > **
> >
> >
> >
> >
> > Hi Group,
> >
> >
> >
> >  My 62 Sport has a 413 with a single Carter AFB.
> >
> > The Carter AFB has recently been rebuilt.
> >
> > When starting from a dead stop the engine "stutters" for a few seconds
> and
> > then performs like new.
> >
> > I had the same problem prior to having the AFB rebuilt.
> >
> > If I "hit the gas" harder at start up there is no "stutter" and the
> > "stutter" seems to get slightly worse when the engine reaches operating
> > temperature.
> >
> > The automatic choke appears to be operating correctly.
> >
> > Thanks in advance for your help,
> >
> > Doug Warrener
> >
> > Fair Oaks, CA
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
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>


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