Holley carb running rich

The engine should be turned off while you are setting the adjustment on all of the screws. Start the engine and turn one of the idle screws in or out.

What you are looking for is an increase or decrease in rpm. If engine speed increases with that one screw, adjust all of the others to match.

If the engine decreases rpm when you are adjusting the others, take them all back to the original setting, because the settings were already correct. After you have attained the highest rpm possible, you might have to turn down the idle adjustment on the throttle linkage to get the correct idle speed you want.

To check manifold vacuum, attach a vacuum gauge to the manifold vacuum port on the carburetor, place foot on brake, engage in gear and record the reading.

So if you get a inches of vacuum reading, you need a 6 power valve. If your vehicle makes 6-inches of manifold vacuum at idle, then you need a 3 power valve.

Caution: make sure you are using a tested, known power valve. Read on for more details and information about the event! Read More. Check out our video to learn more about the car, the story behind it, and to hear that cubic inch Mopar-mill roar! It took our engineering team a year and a half of development before it met their high standards of features, styling and high quality components to give you the performance and looks you want for your Jeep.

Be sure to go to the snorkel product page, or the Flowmaster YouTube channel and check out our detailed installation video for step by step "tips and tricks" to help guide you through the installation process. My Account My Cart.

Holley Carb Rich/Lean Adjustment

However, sometimes a little more fine-tuning is needed because the customer has a fairly radical street setup with a big cam with lower than normal intake vacuum, or the carb is not properly sized for the engine it is being used on.

There are many misconceptions about how to go about these adjustments, and of course there is no shortage of free advice. Following these step-by-step tuning tips are necessary to make sure that your engine runs at peak performance.

Along with these tuning tips, a check of your ignition system, as well as, the mechanical and vacuum advance curves in your distributor is suggested to eliminate any potential timing and ignition problems. Step 1 — Fuel pressure has a big effect on how well a carb works. But if your vehicle has an adjustable pressure regulator, set it for the ideal 6. The proper way to check fuel pressure is with the engine running at idle with the engine up to full operating temperature.

It is worth mentioning that the fuel pressure gauge should be installed on the outlet side of the regulator as close to the carburetor as possible. Step 2 — Next, the float level adjustment can be checked and adjusted if necessary.

The way to do this is to have your vehicle on level ground and with the engine running at an idle. The fuel level should be exactly half way up the window. To adjust the fuel level, first shut the engine off, loosen the locking screw and adjust the large nut that raises and lowers the float on the top of the bowl. NOTE: Adjusting fuel pressure with the engine running could cause a fire hazard.

After you lock down the screw you can start the engine and re-check the fuel level. If you need a minor adjustment, be sure to shut the engine off and go through the adjustment procedure again.

Step 3 — Now you are ready to check and re-set the idle mixture screws.Carburetor list with kits: here PDF. My Account My Cart. Carburetor technical support. Email a Tech. Carburetor Selector Engine:. What type of carburetor are you looking for?

Gasoline Methanol E Automotive Marine. Secondaries: Learn. Choke: Learn. See Results. Technical Resources Carburetor Overview. Overview of a Holley mechanical secondary carburetor, Double Pumper. See More.

Carburetor Installation. Carburetor Tuning and Adjustments.

holley carb running rich

Search Instruction Sheets. Float Adjustment How to properly set your float level. Carburetor Numerical Listing A quick reference replacement parts guide to all Holley carbs. Selecting a Carb A quick reference chart for picking out a carb. Carburetor Flange Guide A quick reference guide to common carburetor flange bolt patterns. Models AA FAQ's Question. To properly size a power valve, take a vacuum reading at idle and if it is above 12" for a standard transmission a 6.

For automatic transmissions take a vacuum reading in gear at idle and if the vacuum is below 12" divide that in half for proper size.

Example 9" of vacuum in gear at idle will require a 4. To set idle mixture screws: 1. Get the engine up to temp. Shut the engine off.

Install a vacuum gauge to a full manifold vacuum port. Turn the screws all the way in until lightly seated. Next, back them out 1 full turn and restart the engine making sure the choke is completely off. Be sure you keep all 2 or 4 screws even. You can also do these adjustments without a vacuum gauge. The adjustments are the same except you will adjust to highest engine RPM at idle.Lorena, Texas South of Waco. Holley running rich. Posted By geo56 3 Years Ago.

Carb Science Series: Holley Power Valves — Explanation And Tuning

Flat Ascending Flat Descending Threaded. I recently replaced the ford 2 barrel carb on my in my 56 victoria with a holly 4 barrel. I believe the CFM is Choke is manual. I would think this size carb would be just about perfect on a stock being that I want originality, smooth idle, and decent gas mileage. By the way I am running the 57 and later 4 barrel manifold and the is a model with the small valve heads.

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After the swap, the difference in acceleration was obvious. The car has much more pep now. Problem is, I quickly get an accumulation of black soot on the inside of my chrome exhaust tips and can see traces of black smoke when I rev the engine. Car idles smooth before warm up in drive with foot on brake in traffic but has a bit of intermittent stumble when warmed up. The carb was given to me by my neighbor who was a parts manager at a Ford dealership back in the 60's and 70's.

He saved a lot of stuff when they cleaned off the shelves That's what he told me His garage was a treasure trove.

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Anyway, the carb looked nearly new but had sat in his garage for at least 30 years so I put a new rebuild kit in it.

I noticed it had 55 on the jets. I also set the floats dry upside down and parallel. One old timer told me I'm expecting it to idle like an old flathead and am being too picky.

holley carb running rich

My first Question is how did You set up the throttle Plates for initial adjustment? The initial Adjustment should just show a "Square" below the Throttle Plate. The more of that Slot that is exposed draws more Fuel. You shouldn't need to change that initial setup much. If You need a little more Air open the Secondary Plates a little.

Resist the Temptation to turn up the Idle speed Screw. There should be a small Screw in the Base that contacts the Secondary lever as You turn it in. Black soot means it getting too much Gas. Check the Float Level by removing the Plug in the side of the Fuel bowl. You should get just a trickle of Gas when You rock the Front of the Car from side to side.

Much more that that means the level is too high and should be adjusted used the adjuster on the Float Bowl. Just a couple of Suggestions from my own Experiences when I changed mine to later Carb and Distributor. Once You get it setup properly it will Idle properly and You should not have any Soot etc.

Any Holley experts? Carb wont stop running rich

Group: Moderators Last Active: 1 hour ago Posts: 5.Any Holley experts? Sep 5, 1. Messages: 48 Likes Received: 1. Sep 5, 2. Messages: 4, Likes Received: 2. Sep 5, 3.

Messages: Likes Received: 1. What does the car have to Idle at inPark, so it will Stay Idleing in gear?? What is your manifold vacuum once the engine is warm What power valve is in the carburator?? These are the first issues to resolve before other measures come to play Let me know, and I can help you fix this issue. Last edited: Sep 5, Sep 5, 4. As far as I know the carb is completely stock, and i'd like it to idle at in neutral as far as initial timing, what should I have it set at?

Sep 5, 5. Messages: Likes Received: 0. Initial timing is relative. Total is the important number imo. Make sure every thing inside is good and tight. I had a loose power vavle once and that fouled plugs in a hurry. Sep 5, 6. Messages: 4, Likes Received: 2, If the engine has backfired you will have to replace the power valve, this would cause a rich condition,and as others have said check your timing.

Sep 5, 7. Messages: 22, Likes Received: Sep 5, 8. Sep 6, 9. A vac sec carb is set up lean with a heavy secondary spring. With a single plane manifold you need deg initial with 36 at total.

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Try a purple secondary spring with a quick change cover. Set the mixture screws with a vacuum gage. A lean mixture can misfire and send unburned gas out the tailpipe and burn your eyes. Might need a bigger pump shooter. Make sure pump cam is adjusted properly. Set transfer slots to show. They should look like square holes.Nov 19, 1. Messages: Likes Received: 0. Nov 20, 2.

Messages: 10, Likes Received: 1. Turn both in to a light seat and back out about 1 turn, see what happens. Make sure the floats are adjusted as well, with the sight plugs out the level should be just high enough with the motor running that gas just barely drips out the plug opening when you jiggle the car side to side by pushing on the fender. Nov 20, 3.

Hi, thank you for your replay, the idle srews are set to the high vacuum level and the flot level is Ok, I don't know what is the problem with this carb. Thank you again Alex. Nov 20, 4. Messages: 3, Likes Received: 0. You could go to a Edelbrock I've had no problems with it so far. Nov 20, 5. Well depending on how the carb was setup for the Monza it just might not work as is for the Not knowing any specifics on how the carb is currently setup in general if you take a carb that is setup for one motor that induces a certain signal across the idle feeds and then put it on another motor that has a much greater signal across the idle feeds it will be too rich.

I am sure Holley can help you out and tell you what to look for exactly. It simply could be that you need to lean out the idle circuits a bit.

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Accept Learn MoreLogin to Your Account. Remember Me? Results 1 to 2 of 2. Thread: Need Help with Running Rich. Thread Tools Show Printable Version. Psychopete Guest. It's on top of a 5. Worked when it was on the truck, but wouldn't die when the passenger idle screw was turned all the way in, so I thought the metering block was plugged.

It's a vacuum secondary with only the metering block in the front. It had been running slightly rich. So, I bought a Holley kit and cleaned the carb out real good with carb cleaner. Now it is running pig rich. Seriously "raining" fuel from the two front venturis.

Tuning Your Holley Carb Made Easy

I have tried different power valves and smaller jets. It wasn't as bad with 61 jets and the original power valve, but still would run pig rich even with the idle adjustment screws turned in.

I think it might be leaking internally? Floats are currently too low, no gas coming out of the sights, so that's not it, I can't even get this thing to idle.

Seriously bellowing black smoke. Not sure where to go from here, any ideas what might be wrong? Thanks, Pete. About us Holley has been the undisputed leader in fuel systems for over years. Join us. All right reserved.We wrote the first of many electronic fuel injection stories way back in in which we proclaimed that the carburetor, if not dead, was on the clear path to antiquity.

That was 30 years ago. Today, the iconic Holley four-barrel is both alive and thriving with continuing innovation. It's now a long way from the endangered species list. Popularity also breeds carburetor misapplication, frustration, and the occasional bouts of misinformation. The traditional Holley four-barrel is incredibly robust and the inevitable problems often have more to do with poor tuning than anything else.

We thought we'd address a few common driveability issues that never seem to go away. Over the decades, tribal knowledge has determined that many carburetor-related issues come down to vacuum leaks, ignition, or fuel delivery problems unrelated to the carburetor.

Yet the carburetor is most often blamed. So the first tip when looking for the head waters of a problem is to make sure the ignition system is in a good state of tune, the engine is physically in good shape, there's decent fuel pressure, and there are no vacuum leaks.

car is running rich how do you lean out a Holley?

To keep within our space allotment, each of these tips will be quick takes, which unfortunately will leave some information on the table.

But digest each of these and they will generate the energy to get your started on the path to pure Holley comprehension. The knowledge base for Holley tuning is not likely to become a lost art anytime soon, and if you become proficient, you just might become the neighborhood expert. Set Idle Correctly This might seem way too simple, but for a carbureted street engine this is the most important tuning step you can make because street engines spend a majority of their time at or just above idle.

The first step is to obtain a low-speed tach that will show minor changes in rpm along with a vacuum gauge. For this procedure we'll assume a Holley with only two idle mixture screws. Many performance carbs now offer four screws but the procedure would still be the same. Before the engine starts, check the position of the idle mixture screws located on either side of the metering block by counting the turns on each one in until it lightly seats.

holley carb running rich

Let's say that the left side is three-quarter turn out and the right is one-and-a-half turns out. The best route here is to split the difference and make them both one turn out. With the engine idling at normalized temperature, try leaning the mixture with a minor clockwise turn of both idle mixture screws. Make these changes very slight and note the effect on the engine. If the idle speed and vacuum increase, continue with similar changes in small increments until the idle speed or vacuum deteriorates.

If the initial change results in a loss of rpm or vacuum go back to the baseline and then turn the idle mixture screws in the opposite or counterclockwise direction. With each small change, wait for a moment to allow the engine to stabilize. This is where the vacuum gauge and tach can really help. Make changes that stabilize the vacuum gauge needle.

If idle speed increases, lower it by closing the idle speed adjustment. Most performance engines will need to be richer—usually around There is a tip-over point between rich and lean where combustion is ideal. This is near a lean mixture as long as the idle is stable.

Cars with automatic transmissions may need a slightly richer idle mixture setting to allow the engine to idle smoothly in gear. For tight converters, we've had to add a half richer mixture to keep the engine running in gear. Much of this is determined by the tightness of the converter. Accelerator Pump Linkage Adjustment If your engine has an annoying stumble just off idle that you can't seem to fix, check the accelerator pump linkage.


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