Adjusting the Idle Mixture Screws 

Good info.

Thanks for pointing that out and saving me the effort. Too many times I see people who complain that they can't (or just don't know how it works) get their carb adjusted correctly. Your info is so simple but, true, if the curb idle is too high, the idle screws are useless... Unless you're working on an "Edelbark" carburetor, which apparently he is. 😉 And it's "whomever..." (Just a tip for whomever). 😆 😊 Have a good one.

you know there is a proper way to to adjust Edelbrock carbs right?

@@eh477 Why don't you explain it to me. I'm obviously off track...

@maniacal s10 Been there done that back in the day ( '60s , '70s )

It's easier than I explained, but I'm not good at getting it out in fewer words. :)

Thanks?

Most people put it on the right for some reason

Thanks 👍

you can do it by ear if you listen good.. adjust till the rpms drop slightly.. then turn 1/4 back and youre good

I miss it when gas was less than $1/gallon. :)

Thanks! Unfortunately you have to have a thick skin if you want to be on RU-vid. Oh well, the good comments will always win over the evil ones. :)

Yeah, they make a great Carb. :)

​@@AndyKruseChannel🤦🤦🤦🤦🤨🤨

Right on!

Nice!

This is just a 60 second RU-vid Short, I can't fit all that into a Short, but it's covered in the full video that I reference in the description below this video.

Well said

Can't I don't have that Carb anymore. :)

Wow, thanks!

Yeah, a little can go a long ways. :)

Maybe if I had an automatic, but that's not needed with a manual transmission.

Thanks 😅

Yes, they are towards the top of the list. :)

On this carb, turning the screws in (clockwise) will create more of a lean condition as you go because the screw is going farther into the threaded port and letting less fuel go by. Once the screw bottoms out, no fuel can get past the screws and it would be the leanest condition possible and the engine will die.

Ok

Thanks! :)

Left port is Ported (see vacuum when throttle plates begin to open) and the Right port is Manifold (see vacuum when throttle plates are closed). It is recommended that you use the Ported port for the vacuum advance on your distributor. :)

ok

I don't know what engine the manufacturer had in mind when they labeled the green zone, but it's really irrelevant with respect to your engine. What you're looking for is the highest vacuum you can find by adjusting your idle mixture screws until the needle won't go any higher. :)

It's all good , well I have the same vacuum gauge ...now the gauge goes in the green but it's jumpy 😅 , not dead steady

@@Kpbugzyi have the same problem it’s very jumpy

@@manmagicman48 stock cam or did u go with an aftermarket cam chop

Yep.

I don't think that stalling is related to your fuel pump, I suspect you need to adjust or redo your idle mixture screws. :)

@@AndyKruseChannel thanks Bud, will give a shot

Yeah, it's weird how stuff pops up sometimes. :)

Yer phone is listening

That has more to do with your cam than the engine or car it's in. You're just looking for the highest vacuum value for your setup. :)

This Short is from the Exhaust video I did about a year ago. :)

RPM is only important during this part of the process when you are trying to maintain your chosen idle while dialing in the mixture screws. RPM needs to be tweaked after setting the screws, and it may require adjusting them again. I cover all this in the full video. What we have here is a RU-vid Short, which is limited to 60 seconds and I cannot fit everything in 60 seconds. But I do reference the full video in the description. 🙂

If the engine won't turn over, it has nothing to do with the idle mixture screws. The first thing I would check is the Starter. If you mean the engine turns over but doesn't fire, and all you did was bottom out the screws and then back them out, I'd check to make sure you didn't break the tip off the idle mixture screws in the idle seat on the carb. If the tip was broken off, air cannot get through there and affect the tiny amount of fuel being sent through the carb during idle. From here it is difficult to help as I don't know all the things that changed from the time it last ran fine until now. If all you did was adjust the idle mixture screws and nothing else, then there's some kind of issue with fuel getting through the carb during fire up.

@@AndyKruseChannel Thanks. Originally the car was set to run at high altitude. Where I live is at sea level. The car would run rough but would take 10 minutes of feathering the gas to get it warm enough to idle without stalling. But it would still stall whenever you put it in gear. So I figured it was getting too much air or not enough gas. So I decided to screw with the idle mixture I seated both screws and at one point could feel the idle smooth out but then it stalled again. The screw on the right turns and rotates in a wobbly circular pattern I know that can’t be right but I’m reluctant to take off the carb and dig further, f’n it up more when it was just idleing…rough, but idleing. Now it won’t start just fires then cuts off immediately.

​@@n8020can we have an update?

Baby steps. :)

Nah, it's all good, I like it better than the Edelbrock I had earlier. :)

My first guess would be the Cam, but if it's the same unit as mine, then it could be differences in the Carb, the Intake Manifold, or even the settings on your Carb. It's tough to say, but the goal is the same, finding the best lean idle condition with the highest vacuum reading. :)

@@AndyKruseChannel thank you. I got it to stop dieseling but now it misfires and stalls when I floor it. The meter also dropped down to 35 from 40 when I tested it last night.

Kind of hard to fit everything into the limit of a 60 second RU-vid Short video. I cover more in the full video.

Ok.

One of the best automotive carburetors ever made. Everything has its place, even jerks.

@@shelbyavant5081 GARBAGE !!!

Spoken like a guy that most definitely has a Holley sticker in his back window.

@@craneguru66 10-4 !

Yes, this process is independent of your engine brand and size. :)

Yes, 10 in by 2 in. Part number = CSI 1208A

Thank you very much

There's a good chance your idle mixture screws need to be adjusted, or it may be as simple as adjusting the throttle itself.

@AndyKruseChannel I have the idle mixture screws 1.5 turns out. If I adjust the throttle, I have to do it so much that it gets into the transfer slots.

@@bobbydelamar606 Possibly the jets and rods may be the incorrect size for the air you are flowing. It's tough to tell without being there. If the engine ran fine before and this issue just started, then I doubt it'll be anything that can be adjusted on the carb.

@AndyKruseChannel I bought the car years ago like this. It's always ran like this. I think the guy who had it put a bigger cam in it, possibly. It does have a chop to it. He also left a rag in the engine pick-up tube I found, lol. Cause it wasn't getting oil pressure.

It could be a clogged idle fuel mixture tubes or float levels. It may help rebuilding the carburetor, and making sure carburetor cleaner sprays through all of the fuel tube passages.

It might be the vacuum gauge, the on e I have is pretty cheap. Like I mentioned in the full video, it's less about the vacuum number and more about achieving the highest vacuum on the gauge you're using. :)

Look at the gauge again on this video, he was not at 50, that is a different scale.

I had to look again. he was at about 20, read the inner scale

8 diamonds!? I must have done something right? :)

@@AndyKruseChannel great teacher 🍾🍾💎💎💎💎

Did that, now what?

I got a holley ill sell you then .

I'll show you how to double your fuel milage while making the same power. Throw the holley away and install a Quadrajet...

I had a holley 4160 on it and if you like them so much ill gladly sell it to you.

Holley could only draw 17 inches of mercury no matter what i did. Edelbrock draws a solid 20. Whats your next excuse/comment?

Super secret, new brand, exactly like Edelbrock.

Carter carb company went broke. Edelbrock took over. The original AFB Carter is now Edelbroke. Good carbs 327 300 hp had the AFB. I had the AFB and headers on a 400 chev suburban. Great pulling power.

It's an Edelbrock air filter, part number 1208. Here's an Amazon link to it: amzn.to/3Xymh9c

Yeah, each can engine can be it's own animal. :)

Mine is 17 at best lol.

ok

This is for people that are learning. A Harbor Freight vacuum gauge is cheaper than a tach, and it will tell you a little bit more about your engine. "Real mechanics" don't bring negativity to good videos like this.

Lots of factors can affect the number one sees, that's why it's less about the actual number and more about the highest number you can reach.

@@AndyKruseChannel my motor, Ford Racing 302 with gt40 heads with ecam

ok

Yes, that's correct.

Yet here you are watching it. Have a nice day. 🙂

Wow sounds like some young ignorant type that couldn’t grasp the simplest mechanics Go try a video game or choosing pronouns or whatever it is you snowflakes do these days in between looking simultaneously for safe places and shit that triggers you.

Thanks