RE: [Chrysler300] Idle speed adjustment question

Your issue isn't the idle mixture screws in my opinion. They should never really be beyond 3 turns if everything else is okay. The idle screws are really for fine tuning anyway.

What are you doing with the idle speed adjustment screw and where are the throttle plates at? (is the idle screw opening the plates at all?) The idle mixture screws become useless if your throttle plates are open too much and if your throttle plates are open that much to keep the car running, you definitely have another issue.
It sounds to me like you have an ignition timing issue or vacuum problem (leak) somewhere. Was the car running well before? (Is this a new problem that started without any changes)
Have you checked all the linkage to ensure everything is working as it should and nothing is sticking?

Ryan Hill

To: Chrysler300@xxxxxxxxxxxxxxx
From: mmoore8425@xxxxxxx
Date: Sat, 19 Apr 2014 15:43:27 -0700
Subject: [Chrysler300] Idle speed adjustment question

I just spent an exasperating half an hour adjusting, (or trying to adjust,) the idle speed on my carbs.

The problem I am trying to eliminate is the engine dying at stop lights unless I keep a foot on the gas and one on the brakes.

Out of gear, the idle speed fine except the transition form hs idle to curb idle is pretty raggedy.

I have been following the factory service manual procedure which calls for initial one turn open on idle bypass screws and one to two turns open on the idle mixture screws. I can get the engine idling at 650 and each idle mixture screw seems to be at max rpm. But when the car goes into gear, it dies. I've been increasing idle speed up to 800, but it still struggles in gear at a stop.

Is it too lean?

I am guessing unscrewing the mixture screws ought to richen it up.

Should the bypass screws be so open as to have audible hissing from the intakes?

Thanks,

Mike Moore

300H

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