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#525630 - 07/23/08 07:00 PM Zenith Carb Question
RickBrinker Offline
Member

Registered: 11/30/02
Posts: 181
Loc: Akron Ohio
Why does my 29 DeSoto idle better with the idle mixture screw removed.It has a new Zenith 14991b

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#525771 - 07/24/08 10:04 AM Re: Zenith Carb Question [Re: RickBrinker]
carbking Offline
Member

Registered: 11/26/04
Posts: 579
Loc: MO
It shouldn't.

Possible causes that I can think of:

(A) low compression
(B) if vacuum tank, then leaking vacuum valve
(C) if electric pump, one with too much pressure.

I am sure there are others.

Jon.
_________________________
Good carburetion is fuelish hot air!
Owner - The Carburetor Shop LLC (of Missouri)

The most expensive carburetor you will ever buy....is the wrong one for the application that you attempt to modify!

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#525830 - 07/24/08 02:11 PM Re: Zenith Carb Question [Re: carbking]
RickBrinker Offline
Member

Registered: 11/30/02
Posts: 181
Loc: Akron Ohio
New engine,no vacuum tank,Yes electric fuel pump will try regulator what pressure should i get. Thanks

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#525867 - 07/24/08 04:29 PM Re: Zenith Carb Question [Re: RickBrinker]
carbking Offline
Member

Registered: 11/26/04
Posts: 579
Loc: MO
The 14991 will handle about 3.5 to 4 psi.

The symptom appears to be telling us that the idle is WAY too rich; therefore removing the screw would allow air to enter the system and lean it out.

You might also try turning the screw all the way in to see what results you obtain.

Jon.
_________________________
Good carburetion is fuelish hot air!
Owner - The Carburetor Shop LLC (of Missouri)

The most expensive carburetor you will ever buy....is the wrong one for the application that you attempt to modify!

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