Re: [Chrysler300] 413 stuttering update

[2HsandaHeritage@xxxxxxxxxxx]

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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