Re: [Chrysler300] 413 stuttering update

[Michael Moore <mmoore8425@xxxxxxx>]

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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