Holley Carb Running Rich? Watch This! | Holley Carburetor Secrets

Holley Carb Running Rich? Watch This! | Holley Carburetor Secrets | Holley Carb Tuning |

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Holley Carb Running Rich? Watch This! | Holley Carburetor Secrets | Holley Carb Tuning |
We are back at it again to bring you another holley tuning video! This weeks video will talk about tuning a holley carb but without any fancy tools. I'll be showing you guys how to tune a holley carburetor by only listening to the exhaust note. If you guys can master this skill. You will know what to look for when you run into issues in the future. This is somewhat of a longer video but it was super important that I bring out as much tuning info to light as I can so that way you guys can get back into the garage and get cranking on your own projects! As always, leave a comment below if you have any issues and I'll try to help you with whatever holley tuning advice you might need!
Holley Carb Running Rich? Watch This! | Holley Carburetor Secrets | Holley Carb Tuning |
#Holley #Holleycarburetor #Carbtuning
0:00 Intro
0:38 Warming It up
1:18 Overview Of Cold Start
2:03 Leaning It Out
2:36 Lean Exhaust Note
2:56 Identify A Lean Condition
3:38 Richen It Up
4:11 Rich Exhaust Note
4:18 Compared To lean
4:25 Identify A Rich Condition
5:23 Smokey Exhaust
5:31 Clearing Up The Idle
6:03 Identify Fouled Plugs
6:44 Rich Or Lean Consequences
7:33 Spark Plug Reading Basics
8:18 Carb Rejetting Basics
8:30 Carb Jetting Tips For Driveability
11:05 Easily Identify How The Carb Is Running
11:29 Idle Adjustment Tips
11:56 More Jetting Tips
12:20 Conclusion
HOW TO SET HOLLEY IDLE MIXTURE AND IDLE SPEED | Holley Carb Secrets | Holley Carburetor
After A long while I have put the most cohesive method of setting up the idle on your holley carb. Setting the idle mixture screws and getting your engine to run clean without having to buy any special tools. In this video I manage to set up the idle in less than 15 mins and also do it quickly and easily. As of right now, the holley carb on the 318 duster is perfectly set up in both idle mixture and idle speed. The carburetor in question is a DEMON 625, an older barry grant holley copy before holley bought out DEMON. It took a little bit of work, but I've got this set up perfectly.
5 Secrets For Tuning And Adjust Holley Carbs That The Pro Builders Wont Tell You | Carb LS |
Tuning Holley carbs are probably the most widely used carb is all of automotive history. The Holley 4 barrel is a staple among racers and cruiser a like but too few people really understand what goes on inside their Holley carb and too many decide to ditch the old carb in favor of a new one. I am here to share 5 secrets you can employ TODAY to get that Holley nice and tuned and running better than ever in true DIY fashion. I'm put to work these 5 secretes to get my Carb ls going so these are definitely something you need to keep in mind. Tuning a holley carb is what separates the boys from the racers. Depending on how well this video does, I'll be breaking up and going into full detail of what goes on specifically in the different circuits as well so stay tuned!
SETTING UP AND TUNING HOLLEY IDLE AND TRANSITION CICUITS | Holley Carb Secrets |How To Tune A Holley
How to set idle on a holley and other such questions are answered! Holley carb wont idle? Car wont idle? Holley carb runs rich? Holley carb wont start hot? All these questions AND MORE will be answered TODAY. too many people have no idea how the holley idle and transition circuit work on a holley carb. too many people belong to the set it and forget it line of thinking when it comes to out of the box carbs and not too many really know whats going on and decide to just give the carb a bad rap. Well, today we are going into an in depth tutorial and explaining on how these systems work and how you can get more out of your carburetor, maybe even pull up a few MPGs while you are at it!

Пікірлер: 146

@VasyaIvanovichPupkin Ай бұрын

You're a good man! I do not have enough vocabulary to describe how far and beyon this effort is compared to other typical explanations out there. Biggest component being the real world example on your own vehicle and not just making engine noises with your mouth. Thank you very much and please continue on the same path. It does not go unnoticed!

@NightWrencher Ай бұрын

Thank you sir! I really appreciate it! I hope it helped!

@philiproark3102 4 ай бұрын

The MOST comprehensive teaching of this that i have seen.Excellent

@NightWrencher 4 ай бұрын

I appreciate it sir 👍

@cHAOs9 2 жыл бұрын

Exactly the info i was searching for. A lot of related details with it for context. Well done.

@NightWrencher 2 жыл бұрын

Thank you! I really appreciate it!

@bryanjobe7213 2 жыл бұрын

Boom! My 454 is running rich. Smoking and sounds like it’s got a cam in it. Great video!!!

@NightWrencher 2 жыл бұрын

Hope it helps!

@bcraiders11 Жыл бұрын

Dropping that knowledge. Thank you man. Best explanation ive seen yet. Been tuning my 1850 on a 350. And everything lines up with need more fuel. So stoked on the carbed LS. boss has one lying around. Maybe its time.

@NightWrencher Жыл бұрын

You can get that 350 to spin like a top. The older SBC were still pretty good motors. Update the ignition, tune the carb and she'll be perfect

@johnb2674 Жыл бұрын

Bad ass truck! When I was 16 I got a 73 4wd power wagon. Wish I still had it.

@NightWrencher Жыл бұрын

Thanks man, this truck will be a beast after its done 👊

@piercesean82 Жыл бұрын

Very informative, thanks a lot.

@ZZ-bt2jr 5 ай бұрын

Thank you so much for this video. I have watched so many carb tuning vids, hours worth. Many are so long winded, yet I learn barely anything really useful. Most of them talk to you like you're new to tuning carbs which is good, BUT they also leave out critical information that someone new to carbs wouldn't know, such as how to hear rich VS lean. Many will say "if youre running rich here's what you do" without giving any info on what to listen and watch for. You covered a lot of info I've never heard before that is great for beginners. Some people think they're good teachers but they're not quite suited for it. You sir are a decent teacher.

@NightWrencher 5 ай бұрын

I really appreciate it man. Makes me feel like I'm actually helping someone with my videos!

@ZZ-bt2jr 5 ай бұрын

@@NightWrencher you most definitely are! I say this to all my favorite youtubers: I love watching you do what you love, and I love learning as a byproduct of that! Keep doing you my dude, that's what's drawing the crowd in. You rock

@NightWrencher 5 ай бұрын

Thank man, that means a lot 👍

@goober2021 11 ай бұрын

Great vid man

@WindOnMyWings 2 жыл бұрын

Thanks, your advices are very useful

@NightWrencher 2 жыл бұрын

I appreciate it! 👍

@Corolla_Beau 2 жыл бұрын

Hmmm!!! Exactly what information I’ve been searching for!! Great explanation!! Been trying to tune my carb and it’s been popping in the exhaust and stuttering when trying to give it gas….. I’m gonna try this tomorrow mahalo nui!

@NightWrencher 2 жыл бұрын

Thank you! I hope it worked out!

@mailbox_money1197 Жыл бұрын

Nice explanations. Thanks

@mkepler5861 11 ай бұрын

thank you that was very helpful!!! thumbs up, and I was already subbed!!!

@robpeters5204 2 жыл бұрын

Great explanation! Thanks.

@NightWrencher 2 жыл бұрын

Thank you!

@ZPDSurvival 2 жыл бұрын

Great Video. I will have to watch again. I am completely lost at this point tuning a 1974 Honda XL250. Going to check timing and dwell. Haven't done that yet. Played around with jetting and needle so much that I am getting closer. Taking a break and making sure timing and points are set correct.

@NightWrencher 2 жыл бұрын

I'm not too familiar with that engine but the stock settings for that carb wont work? Also, with any engine with adjustible timing, ignition should always be set first.

@ZPDSurvival 2 жыл бұрын

@@NightWrencher Thank You. It's been years since I worked on my old Volkswagens. This bike is taking me back there. Enjoy your day.

@beeasy4360 Жыл бұрын

I put a wide band 02 on mine said screw it really helps on tuning it in great videos

@JimmyMakingitwork Ай бұрын

Truck is gonna be cool, headed there for sure!

@davidm2778 Жыл бұрын

Awesome video...

@omarlovejoy9086 2 жыл бұрын

You explained rich and lean perfectly

@NightWrencher 2 жыл бұрын

Thank you sir! Hope it helps!

@bcraiders11 Жыл бұрын

Forgot the glow plugs bud. Hahaha. Dude sick truck.

@lr22same47 2 жыл бұрын

Good stuff, thank you.

@NightWrencher 2 жыл бұрын

I hope it helps you out!

@shorty5346 Жыл бұрын

Very interesting although mines not as simple as that my Toyota will only run at 28 turns on my mixture screw but if I try to turn the screw in the engine just starts to die so I seem to be stuck at twenty eight turns

@leinadalan 3 жыл бұрын

Ok then, I'm going to reset tomorrow, back to stock. Even tho engine was dynoed to find jet combo. Everything, iab, ifr, jets. Only thing I won't mess w is PV. 4.5 in now. Makes like 9 to 10". Great vid man.

@infamousnova 3 жыл бұрын

If it was dyno tuned put it back in that configuration

@leinadalan 3 жыл бұрын

Engine dyno, not wheel. Still back to that? Also, are IAB supposed to be the same size prim and sec?

@NightWrencher 3 жыл бұрын

Engine dyno and wheel dyno will have a different tune so your best bet is to go circuit by circuit. The iabs are usually square front to back

@penmaster615 9 ай бұрын

Just found your video, i have a 350 with flat top pistons. A holley 600 carb, it sounds like a cam in it when idleing but its not that much of a cam. I tryed leaning it 1/8 turn balanced and it wanted to die at lights and was stumbling. I put it back richer and it was ok, but my plugs are dark? I just got a vacuum gauge, what should it read when correct tuned?

@leinadalan 3 жыл бұрын

Nice. Still trying to get my turd to run better. Just got a new hp body. May try it tomorrow.

@NightWrencher 3 жыл бұрын

That'll be sweet man. It'll throw your tune out the window though. Keep everything else as it is and just swap the main body and see how it responds. Figure out if you gotta go rich or lean and then go circuit by circuit.

@donblue3725 Жыл бұрын

very helpful

@NightWrencher Жыл бұрын

Thank you sir!

@user-mr3mf8lo7y 2 жыл бұрын

Hi great video(s). Much appreciated the efford in making those. Wondering if you kindly make a comment on the situation I have with my motorbike/carburator. 250cc. Mikuni-34. The carb is super clean, jets and all. No air leak. However, it stalls after about 30 seconds on idle either on cold start, or, at traffic stops. When driving non-stop/high-rev it is perfectly fine. Perhaps, it is the float level? I played with it but did not help. Should I change pilot jet to something else even though Yamaha indicates 47.5 on manual? Any comment? Thanks a bunch.

@NightWrencher 2 жыл бұрын

I dont have too much experience with motorcycle carbs but you can try covering the air inlet to block most of the air from going in. If the condition gets worse, youre running rich, if it gets better, youre running lean. I'm willing to bet your idle circuit is running lean.

@tdtrecordsmusic 9 ай бұрын

awesome thnx

@davidrowland2354 7 ай бұрын

My idle air fuel ratio is perfect it leans out whenever I get on the gas

@Rodeshion 14 күн бұрын

When accelerating and getting hesitation it can also be a rich condition

@joegomez478 2 жыл бұрын

How much engine vacuum should a solid engine show (351 w/ 4bbl Holley carb) I was tunning it for a friend but could only get 16.5 vacuum...86 ford f150 351 crate engine. It is running smooth though.

@NightWrencher 2 жыл бұрын

Theres no specific number. Vacuum changes depending on the cam. Just dial in the timing and idle mixture for max vacuum and thats what it will be.

@joegomez478 2 жыл бұрын

@@NightWrencher cool thanks....where are you located...I'm in El Paso,tx, really like your channel....thanks again.

@johnnyrichard1631 2 жыл бұрын

What would make one side lean one side rich. Basic same set up as yours.

@NightWrencher 2 жыл бұрын

If you mean left and right, there could be an issue in the carb where you might have some junk blocking the fuel on the lean side. On a single plane you could get left side lean/right side rich or viseversa but in a dual plane, if you have an issue with left and right, something else is going on

@matthatesford 3 ай бұрын

At 11:23 you talk about putting a hand over the choke primary. I have a Holley 750 (Barry Grant variant) on my 383 stroker. 10.7:1, pretty rowdy cam. No choke plate but when I block off the primary the motor dies. Showing symptoms of a rich condition but afr is close to perfect. 13.5 ish at idle and high 12s across the board all the way up. I'm already jetted down lower than I think I should for this motor, I was even lower with similar results but currently at 72 primaries, 77 secondaries. Acc pumps are 15 thousandths off at idle, 5.5 PV, needle and seats good, float adjusted at bottom of sight hole, 31 squirters front and back. Valves checked and lash set. It's not like it's running horribly, afr is good but getting some exhaust pop in the higher range and a little smokey (fuel smoke). Any ideas?

@NightWrencher 3 ай бұрын

So heres a tip. If you have a cam with a decent amount of overlap, your AFR gauge will read false lean at idle and low RPM. The only way to tune that would be with a tach or with a vacuum gauge. First make sure you have enough timing at idle for the cam(tune it the same way, with RPM or Vacuum). Second, set the preliminary idle speed and tune the idle mixture. As you dial it in, the RPM will climb, and once you go too far, itll dip back down. I like the idle a hair rich to compensate for different weather conditions. As for the popping, if it pops on high RPM decel, you probably have the idle speed set too high, you might have an exhaust leak or you're running too rich. If the exhaust pops on consistant acceleration into the upper RPM and you feel the car hesitate, its lean or the plug gap is too wide. If the exhaust pops while you're accelerating in the upper RPM, you're too rich or have an exhaust leak. Hope this helps.

@matthatesford 3 ай бұрын

@@NightWrencher timing has been dialed, lightest springs with 38 total and it's very happy there. I did end up finding my popping culprit, #8 plug was closed up and sending unburnt fuel through to be ignited in the collector, must have happened during my last plug read. Don't remember hitting it on anything going in but alas, that issue is fixed. Still pig fat, blowing puffs of black smoke on throttle cracks and raw fuel smell at idle. I'm gonna look at my transition slot and adjust my secondary blades tomorrow. Plus mess around more with acc pump cams again. I'm thinking my transition slot might be too uncovered with my 1000 rpm idle, cause my idle circuits don't have as much adjustment in them as I think they should.

@NightWrencher 3 ай бұрын

If your carb is a 2 corner idle carb, do not try to open the secondaries at idle. You're just going to wreck distribution and lower your idle vacuum. 1000rpm at idle is way too high. Even my 73 charger with a 294/294 advertised on a 108 LSA cam shaft, idles smooth at 750 rpm hot. Reset your idle screws and start over from scratch. You want that front throttle plate as closed as possible. Its doesnt "need" to be square but it definately cant be taller than a square.

@matthatesford 3 ай бұрын

@@NightWrencher FYI this car is a bracket car, will spend most of its life doing the 1/4 mile. So I don't care about driveability, just peak power without putting holes in pistons lol

@NightWrencher 3 ай бұрын

kzfaq.info_Fve1wtlIOc?si=uIAn6OJWU1n2-kv0 heres a video of my car idling

@chiefjoe528 2 жыл бұрын

I wish you could tune mine. I have a Holley 80457-2 4 barrel. Mine starts fine, revs fine without a load. When I drive the hills of San Francisco, she is struggling to even getting up the hill. Even if I put the engine into a lower gear, it’s not getting better. 350 Chevy. The car has electronic ignition and new plugs and wires. Feels like I can’t get more power from it. No backfiring either. Thoughts.

@NightWrencher 2 жыл бұрын

I have that same carburetor. Its a 600 single feed VS. First of all, you need to make sure you have enough timing in it to it runs right. You want at least 13 degrees of timing at idle and 32-36 max at WOT so you can get the best road maners. Aside from that, I'm willing to bet your carb is running too rich. Usually if you go into a lower gear, the AFR will go richer with less load and if you go up a gear and lug the engine, it would go lean. Second, since youre not getting a back fire, that would also indicate that its not running lean. If you can, drive with a vacuum gauge, see if youre getting below 7" of vacuum going up a hill since that would open the power valve and pull more fuel. Pull a plug, and if its jet black, youll be able to pin point it.

@Aceman597 4 ай бұрын

Check power valve.

@archangelx2x097 2 жыл бұрын

Carb newbie here. I have the same carb on my 74 Plymouth. Why do we adjust the front screws and not the back ones?

@NightWrencher 2 жыл бұрын

I thought I had already answered this comment but I guess not. I don't think you have the same carb as me because my carb is not a 4 corner idle carb so it does not have rear idle screws. I have an idle adjustment video on a 4 corner idle and I do go through and adjust all 4.

@archangelx2x097 2 жыл бұрын

@@NightWrencher thank you man! Do you have a link for that video? I'd like to give it a watch. Appreciate the help!

@NightWrencher 2 жыл бұрын

No problem, here it is kzfaq.info/get/bejne/nb1laKdhleDUpps.html

@abmcd9381 Жыл бұрын

Great vid as usual! Im having a problem where Ive dialed it in as far as smooth running and 800 rpm but am still running rich (smoke in the exhaust, stinging eyes, carbon on the plugs). Ive got a demon 850 on a 454 with a mild cam. I also did the air restriction test covering the air flow and the rpm drops off and stalls. Each corner idle mix is 1/2 turn out.

@NightWrencher Жыл бұрын

Depending on the lope of the cam, it could be normal, but what is your timing set at idle?

@abmcd9381 Жыл бұрын

@@NightWrencher Ill let you know shortly...day or so. Typically what would you say it should be all in and at idle?

@NightWrencher Жыл бұрын

All in lands somewhere in the 30-36 range. Idle around 15-20

@abmcd9381 Жыл бұрын

@@NightWrencher Im at 26 at idle.

@NightWrencher Жыл бұрын

That seems like a lot but as it starts up like its supposed to, its ok. Do you have a 4 corner idle carb?

@Truther00 Жыл бұрын

Could you do a video on the holly sniper

@NightWrencher Жыл бұрын

I would but I do not own a holley sniper system.

@jovanitorres8128 Жыл бұрын

I'm running rich should I downsize the jet n PV. Thanks for the video

@NightWrencher Жыл бұрын

It depends what circuit is rich. Main jet and PV had no effect on idle. Idle and PV has no effect on cruise, etc.

@jovanitorres8128 Жыл бұрын

Idle is kind of high try to adjust but nothing stock carburetor had it for some years never did nothing

@NightWrencher Жыл бұрын

If its a holley, I have a video on how to set the idle. If its not a holley, I wouldnt be able to tell you where to look. Just make sure you dont have any vacuum leaks

@jovanitorres8128 Жыл бұрын

@@NightWrencher yes it's a Holley going to start messing around with that Jets and look for any vacuum leaks

@NightWrencher Жыл бұрын

Good luck man, its tricky but just go 1 at a time and you'll get it 👍

@1marcelfilms 10 ай бұрын

My generator sounds like that popping sound at idle.

@retromeatball4402 Жыл бұрын

im just trying to get my holley 2099 carb tuned on my 65 Rambler Classic 😭😭

@NightWrencher Жыл бұрын

Should be pretty easy. Make sure to set your ignition timing before you start messing with the carb and then watch my holley idle video 👍

@arthurhill2388 2 жыл бұрын

I thought the idle circuit was for idle only .. cause once your throttle opens past the idle circuit it is no more

@NightWrencher 2 жыл бұрын

Thats not quite true. All the circuits stack on top of each other the idle circuit makes less of an impact with more throttle but it still makes a difference in the tune.

@arthurhill2388 2 жыл бұрын

@@NightWrencher but yet if your idle is to high and the the thortles blades are past the circuit slots you'll never get your air fuel set right and also your jetting will also play part with your power valve as for tuning also for lean or rich vacuum also has a play there also

@NightWrencher 2 жыл бұрын

Biggest impact the idle feed will have on the tune is in the transition circuit. Once you go into the main circuit, so much air is flowing through the engine that the small amount of fuel from both idle and transition wont make too much of an difference. The point of the video was not to show you how to fix a lean or rich condition on your carb, it was so you can identify a lean or rich condition based on sound reguardless of what circuit you're in. If you want to tune individual circuits, I have seperate videos on each of them in my holley carb secrets playlist

@arthurhill2388 2 жыл бұрын

Not trying to down any thing you say I'm still learning also my self ... Keep up the research as I am also it all a bit tricky to rap my head around specially with a modified engines I have a lowered 89 Silverado with 383ci 750 double pumper and a 60 olds with a 454 bored 100ths 477ci with a 850 double pumper fun fun fun .. head ache head ache head ache ... Lol got to love em though...

@arthurhill2388 2 жыл бұрын

@@NightWrencher I'll check em out thanks

@steverose2405 Жыл бұрын

You need tighter shots of the carburetor; I don’t know what screws you’re turning.

@jimpanzer07 3 ай бұрын

idle mixture screws, usually 2 or 4 screws that look the same

@Kabeeb 8 ай бұрын

Mine sounds like it has a cam but also pops and hesitates 😭

@NightWrencher 8 ай бұрын

Idle could be rich and part throttle could be lean. Not enough timing is also an issue

@Kabeeb 8 ай бұрын

@@NightWrencher what would cause that? Also I have a volvo 340 and the timing cannot be adjusted

@NightWrencher 8 ай бұрын

@@Kabeeb You would have to identify exactly whats happening and then adjust that in your carburetor. So for example, if you car is running rich/lean at idle, you would have to reset your idle speed and idle mixture screws and tune them to accordingly. If your carburetor is non tunable, and your timing can't be adjusted then there might be something wrong inside your carburetor or you have and outside force like fuel pressure, regulator problems, internal leaking, things like that.

@wktg4 2 ай бұрын

God bless you always in Yahweh name

@infamousnova 3 жыл бұрын

I know mine is running rich at idle lol!🤭🤨😐😔😔🥺😤😤😤

@NightWrencher 3 жыл бұрын

Time to adjust it down!

@chrisnew2752 Ай бұрын

Oh no a ls in a mopar??? Ahhhhh

@NightWrencher Ай бұрын

😂

@austindoud273 2 жыл бұрын

All y'all just need to buy a wideband

@NightWrencher 2 жыл бұрын

Well a wideband is only half the story. On rowdy cams with a lot of duration, a wideband is pretty much useless at low load/ low rpms because of the amount of air passing to the exhaust during overlap. Also, if your o2 sensor is going out, itll tend to read rich so if you know what to look for, you can verify if the wide band is reading right or not. My favorite tuning device is a wideband but theres a time and place for everything.

@rogerdodger6888 2 жыл бұрын

@@NightWrencher This must be why I gave up on my wideband, started over the old school way,

@NightWrencher 2 жыл бұрын

Yeah, its tricky sometimes 👍

@NightWrencher 2 жыл бұрын

Yeah, its tricky sometimes 👍

@Warrior_Resisting_Colonialism Жыл бұрын

There's no "secrets" here. Just the basics I already know. I can't get my Holley 750 to idle clean. It's running rich like a pig at idle and I can't clean it up.

@NightWrencher Жыл бұрын

How much ignition timing are you running at idle?

@Warrior_Resisting_Colonialism Жыл бұрын

@@NightWrencher I had it at 6 but I bumped it up to 10 and it seems way better. I got the carb tuned so it's not running rich. My idle between park and drive are VERY drastic though so now I'm trying to figure that out.

@NightWrencher Жыл бұрын

I would add another 5 degrees of inital timing or move your vacuum advance to the manifold

@Warrior_Resisting_Colonialism Жыл бұрын

@@NightWrencher vac advance is already at manifold. The problem with advancing, seems to make it much harder to turn over and the starter, battery and wires are all new.

@NightWrencher Жыл бұрын

Usually you can get away with 13-15 at idle before the start starts to struggle. Low RPM in drive can be too tight of converter for the cam, idle too lean or not enough base timing