RE: [Chrysler300] 300F -- "Stumbles" On Takeoff

["john mc adams" <clafong@xxxxxxxxxxxxx>]

Mike:

It sounds like it might be happening at the transition from the idle circuit
to the cruise circuit within the carbs.

I would also look at your distributor advance curve.  Not just the initial
advance on the distributor itself, but the built in mechanical and vacuum
advance curves inside the distributor.  Maybe the vacuum pot is not
functioning properly.  

The modern gas in some parts of the country needs a little more advance.  I
cannot tell you what is proper but this could definitely contribute to your
stumble.

John Mc Adams
(In SoCal)

-----Original Message-----
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Michael Reed
Sent: Monday, June 27, 2005 11:16 AM
To: Chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] 300F -- "Stumbles" On Takeoff

Before I had the carburetors rebuilt this spring, the F "stumbled" on 
takeoff from a dead stop (engine idling), like as if the accelerator 
pumps were not functioning correctly. After a two-second "stumble" the 
engine takes off and runs/accelerates normally. Depressing the 
accelerator while driving at any steady speed does not result in the 
stumble. It appears to occur only from idle.

During the rebuild, the accelerator pumps were replaced. The rebuild 
fixed a couple of other carburetor problems, but the stumbling is not 
a any better.

I noticed the accelerator pump setting (27/64" from top of pump shaft 
to the top of the air horn) is a bit low for one carb, and quite a bit 
low for the other (3/32" maybe). I wouldn't think this would be the 
cause of the stumble, but... I'm not sure. It sure acts like the 
engine isn't bebeing enriched on inital acceleration from idle.

Anyone experienced this situation? Cure... Ideas...

Mike in sweltering Lake Odessa, Michigan




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