4180 wont lean out

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Aug 22, 2004 | 10:07 AM

Zoomie331r

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Joined: Jul 2004

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From: ozark hills of mo

4180 wont lean out

I cant get the 4180 on my 85 351w to lean out adjusted till Im blue in the face tried backin out 1 1/4 then 1 1/2 but to no avail

Aug 22, 2004 | 06:28 PM

Pam's Red

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From: Front Range of Colorado

Check for air leaks on the carb and base, also vacuum leaks.
Pam

Aug 23, 2004 | 09:35 PM

LxMan1

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From: Louisville,Ky.

I would suspect a blown power valve.

Aug 24, 2004 | 08:21 PM

76supercab2

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Joined: Feb 2003

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to lean out the idle mixture you have to turn the screws IN. if you want to lean out the run circuit, change the jets.

Aug 27, 2004 | 11:57 PM

Highorder77

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In addition to the advice in the previous posts, the 4180 has 4 adjustment screws (2 for the front barrels and 2 for the rear) - this is assuming that the carburetor IS NOT a feedback (computer controlled) version (don't know if they even made any). Fuel level in the bowls is important as well - it must be correct as well as the basic condition of the carb. Vacuum leaks are killers, whether they be in the carb or manifold or interconnecting hoses. What I did for the one I was playing with was to set the front two screws to 1 and 1/2 turns out and use the rear two for final idle mixture adjustment (cause I couldn't reach the front two after it was installed). Averaged 14 MPG with this method on a 302 with some "hot" parts.

More detail as to your situation would be helpful - but I hope this helps

Jim

Aug 29, 2004 | 11:43 AM

LxMan1

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From: Louisville,Ky.

Still sounds like a powervalve to me, carbs just don't come out of adjustment by themselves,

Sep 3, 2004 | 03:19 AM

Gunsmoke460

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Joined: Nov 2003

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From: Kyle, Texas

i solved my holley problems with an edelbrock 750. best holley remedy i figured out yet, beats adjusting your holley every week.

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Sep 6, 2004 | 11:12 PM

80351

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Joined: Sep 2004

Posts: 11,676

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From: Pine Level NC

4180 won't lean out

All this advise sounds good. I am working with one now and had same problems until I set the bowl levels correctly and tightened a few screws (vacuum leaks)
Now it seems to be OK and now I have aquired another one which went on today.
Dave