OpenTube

How to Adjust Idle Mixture Screws

KruseBuilt

168,796 views

I recently upgraded the factory carburetor to this Edelbrock 1406 unit, now I need to adjust the idle mixture screws, and I show you how to make the idle happy using a vacuum gauge.

Edelbrock Carburetor part number #1406; Amazon Link - https://amzn.to/4g1fmhW
Vacuum Gauge - any generic gauge will work; Amazon Link - https://amzn.to/3FDKtzL

Check out me new website for parts and merch that I am selling - https://krusebuilt.com/collections/all
Want to help support this channel, you can "buy me a coffee", check it out! https://www.buymeacoffee.com/krusebuilt

Basic Mechanic Tool Set - https://amzn.to/3Hso7pv

The car is a 1966 Mustang Fastback with a factory V8 and C4 transmission.

Shot with GoPro Hero 8 with the Media Mod, edited on Davinci Resolve 17.

Credit for the music in the video:
::::::::::::::::::::
Epidemic Sound
Try it today! https://www.epidemicsound.com/referra...
::::::::::::::::::::

#Mustang
#1966
#Fastback

20 Comments

@tintinkerouac948 4 days ago

Very nice! Much clearer than the carb owner's manual...

@timg8045 3 years ago

Nice video! This one made the most sense out of a bunch that I’ve watched. 👍🏻

@CharacterDrawingStudio 4 years ago

Thanks so much Andy I have a 66 and I watch all your videos ! Great job

@randypascarella 4 years ago

First! Thanks for this, I’ll be doing the same in a few weeks when the weather cooperates. Engine and bay looks nice and clean!

@leeread6757 4 years ago

Thanks for the video.

@1j007zm 2 years ago

thank you! :goodvibes:

@davidklein1565 3 years ago

That was very well explained thank you.. I'm needing to swap my carb (70 chev 355 Blueprint) this week and I'm no mechanic. lol wish me luck!

@flyingfruitbats 4 years ago (edited)

Adjustment should be incremental i.e. a 1/4 turn at a time, + other screw should be in same position as the screw adjusted. So if one screw is 1 1/4 out, the other is too. You need to allow some time for the engine to react to the adjustments before you make more.

@darylcameron2063 3 years ago

I am running a Edelbrock 1406 600 cfm on my 305 smallblock and last summer once I installed it. I marked the screws with a sharpie to know the location between the two when adjusting them.

@nursecuenca 3 years ago

Great video. Im new to car scene and learning so much from people like you. So I wanted to say thanks for great content. I was wondering why you dont have both vaccum advance hose and vaccum manifold hose connected to carburetor? Just subscribed to your channel.

@chrisbraswell8864 1 year ago

We always went for highest rpm then richen 1/4 to 1/2 turn. Seems to work and idle good.

@lucadesiervo2684 3 years ago

Good clear info thank you

@zrex8911 3 years ago

I didnt know sam the cooking guy had a car channel

@rjohnson6226 4 years ago

Awesome video Andy. It’s easier setting my priorities to yours so I can easily follow along.

Question: you mentioned headers are coming soon - are you planning to keep your pipes and mufflers or eventually redo the entire system?

@mikegrotte3953 4 years ago

The Best !!!

@INTERNA9 4 years ago

AWESOME

@hmayerv8 3 years ago (edited)

Awesome video. I noticed your vacuum from distributor is ported. Ported or manifold vacuum, this debate seem to continue endlessly. My non-emissioned Chevy engined cars of the 70's which I owned had the vacuum on manifold and they ran like there's no tomorrow. Was always happy with them. But now, many do say it's got to be ported. I've tried ported vacuum on a stock 302 & 350 using new Edelbrock carb like yours, it idles rough and initial take off performance is not good. tried every which way to re-tune, and then ended up with manifold vacuum and everything suddenly seems perfect throughout the rpm range as we take off to cruise speeds. Back to ported again not good, back to manifold and you just love the way it goes. So what gives!