How to fix Bogging/hesitation when accelerating or hit WOT (wide open throttle)
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- Опубликовано: 23 сен 2021
- Ep: 25
in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. Car used in this video is a 1976 corvette stingray that would bog when punched on the gas too fast or quickly. This of course will apply to most classic vehicles equipped with a Rochester 4 barrel Quadrajet / Quadra jet carb
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The set screw on the older Q-jets took a 3/32" allen wrench. Thanks for the video.
I was looking for this about 3 years ago.. gave up right before this video.. thank goodness I found it now!
wish i would have made it 3 years ago lol...but now you know, incase you face these troubles again in the future.
Exact issue I’m having you got yourself a new subscriber 👍🏾
Sweet!! Thank you!
the trick with a rochester quadrajet is to keep at least one or two extra carburetors. you grannie tune one for fuel economy and emissions if you're state or province mandates emissions testing. you keep that carburetor in a box and leave it in the trunk or shop bench. then you take an older quadrajet and you "school bus calibrated" slightly fatter mixture on primaries or idle mixture, then you find or make a set of secondary fuel rods that are like toothpicks on the tips. you can make the adjustments in small increments to achieve the right amount of mixture for wide open throttle. no little 750cfm square bore or double pumper should keep up with it. unless they knew how to tune it better than you
My 1995 Chevy 5.7 is having this issue, thanks for showing me this,, ill give er a try
Thank you kindly but Unfortunately the 95 chevy will have a different set up. It should be Throttle Body Injection (TBI) which is a newer technology compared to carbureted which is what I showed on this video...
The Pull Over Enrichment holes(POE) on YOUR carb model are also ABOVE the leading edge of the air doors. If you've made any performance mods other than your intake, you might also want to consider cutting two small semi-circular openings(the size of a pencil eraser) on the air doors by these holes. This will start the flow of air/fuel mixture thru the POE quicker as the air doors begin to open thus preventing bogs.
Thank u so much I have that same problem with my 1976 caprice so thank u
Youre very welcome 🙏
Good job body
Real knowledge professional demonstration
Thank you kindly for your feedback 🙏
heybthanks for these tips. something similar on my 61 d200 the spring wire that closes the flap broke and maybe i didnt have it set back right so inwill try that first
Nice video, i love learning about these old quadrajets. Also, your 76 is the same paint/interior trim as my 77.
What a coincidence! And thank you for the positive comment bud. Really appreciate it 🙏
Nice explanation!!!
Q-jet. I used to rebuild them. Took me around 40 minutes for a rebuild.
Helped a lot, thank you.
You're very welcome 🙏
This helped me out with my little Toyota 22R. Thanks!
wow i’m about to try this on my 81 El camino
Great video!
Thank you very much!
The most simple explained and detailed way I've seen yet. Mad kudos my brotha. And thank you!!!!🔥🙌🏻🙌🏻🙌🏻🤘🏻🤘🏻🤘🏻
Really appreciate your comment brotha!
@@EddiesCustomsandRestorations anytime man. I'm literally going outside now to fix the bog on my quadrajet on my 86 c10.
@@chuckvalhallen lol hope this is your issue bud. Best of luck and thanks again
@@EddiesCustomsandRestorations oh man....just my luck....I think I tightened the bottom one too much cause the flap isn't getting tight now and I knew better than to crank down on it. Shittttt. I just got done doing a flex plate replacement and I restored my gas tank as well. Finally thought I was gonna be in good shape lol
@@chuckvalhallen lol it's spring loaded so give that side screw like a half turn then snug the bottom screw to hold that half turn setting in place
great video
Thank you very much
i have this issue but opposite, when we floor it the pedal goes smoothly but when going slow it stutters and catches on something and then goes which make it (my truck) un-drivable, its a 72 C10 Chevy L6 250, we replaced the carb, the return springs and the throttle cable but now its giving me this issue where low rpm has a stutter (gas pedal alone) but flooring it no stutter at all, like the cable is getting stuck
Well dah! I knew this over 50 years ago.
I wasn’t even alive 50 years ago so I needed to learn this for my 67 mustang rebuild lol
Would that work for a 2 barel carburator my choke plate is loose
How much tension for a 4.3?
My car when driving on the high way when trying to speed up takes time like when I hit the gas pedal it doesn’t take off right away .. it’s delayed … and sometimes when I step on the gas pedal and my air is off I can feel the air coming through
So I have an 89 s1500 and I'm having the same kind of issue. Except its a tbi so I don't have back runners
Check your fuel pressure. Could be the fuel pressure regulator or fuel pump.
Many thanks
Youre welcome 🙏
Looks like your accelerator pump lever is in the wrong hole. I’ve never seen one in the outer hole. I’ve only seen it in the inner position.
Good video
Thank you!
My issue with my 81 vette is the front one wont ever close. it barely moves at all.
I got a 1978 Mercury Grand Marquis and its doing the same thing. It starts up and all that but once I accelerate or try to reverse, it stalls. I'll try this and hopefully it'll work.
Your timing might be off more than anything
Lol that's a good way to explain. It blaahhh lol I understood what I meant !
Lol 😆
My 63 Impala Kills when I give it gas. Gonna give this a try.
very helpfull your video,i got a question my pick up does the same thing,,except is a diferent carburetor, dont has those screws,any idea to solve it? gmc sierra 94,,,
Thank you kindly 🙏! And Your adjustment screws might be a bit off. May need further tuning. Vacuum guage helps.
My 76 nove with a qjet did the same but on my case was a baccum line for the ac component that was broken so guys check all your baccum lines
Thank you for sharing!
My 84 El Camino with a 305 is doing this exact hesitation but I have a 4 bbrl edelbrock, ….what advice can you offer
Have you fixed this problem my 84 elco with a 305 and 4 barrel is doing the same thing
Cool, im still debating if i want to go carb or efi on my truck… i am wanting to get it running already so i may just have to bite the bullet and get it done
What do u currently have?
@@EddiesCustomsandRestorations both 🤣
How about a '94 Mazda 323 carb?
Hey I'm having an issue, where it idles high and doesn't idle down until you put it in gear, then you have to be quick on the gas or it will die, if you take your foot off the gas while in gear it will die, my butterflies have no tension either and are wide open
Add the tension first and set that up. Then after that you can continue setting up your air/fuel mixture screws. Also check for vacuum leaks
Thanks, it was an egr valve
@@SaltandPaprika how can you tell?
I wonder if this works for the holley replacement for the quadrajet. I just picked up a '74 nova with a holley economaster carb on it and I've been going nuts trying to figure out the off idle bog issue. I even went and grabbed an edelbrock carb and weiand intake to swap.
Edelbrock carbs are good cruiser carbs. Best of luck on your project
I have the same problem but in a fuel injected mazda b2200 1990. Any idea what to look for since I don’t have carburetor?
Dirty fuel filter, weak fuel pump, dirty Throttle body. those are some possible causes.
i have the same ecaxt problem but mine is different than yours i don’t see any screws i see a spring on one side but there’s no tension any Suggestions
not a spring i got a closer look as the thing and it’s a wire that runs back a little bit but it has no tension
I got a 95 Sonoma we did a v8 swap on from a 92 Silverado 5.7 with a Tbi. Having a issue where it runs great until I go open throttle and it starts sputtering and backfiring any idea what it could be?
Vacuum leak, fuel pressure too low, a failing coil under load, restricted injectors could all be problems
@@EddiesCustomsandRestorations Distributor is new new pick up coil,primary coil new, ignition module,cap, rotor, plug wires, spark plugs, throttlebody has been completely rebuilt only problem is runs excellent until wide open throttle then it acts like it’s running out of gas fuel pressure stays at 13.2 throughout the whole RPM range even at wide open throttle. The only thing I’m thinking is that we used the fuel module from the 2.2 L and I’m wondering if we’re running out of fuel volume The pressure stays at 13.2
I know its far off but I got an 02 chevy Silverado 1500 with the same issue when I accelerate hard but not under normal driving and I got no codes... Any help or ideas on what it can be? Thanks in advance.
Check your fuel pressure make sure that it doesnt drop under like 40 psi when you accelerate hard. If you havent done spark plugs on it in the past 100k miles, i suggest new plugs. You can have a restricted exhaust like a clogged catalytic converter. A bad throttle body/throttle possition sensor. Clogged injectors, clogged fuel filter. All of those can be affecting the truck...I wish I could narrow it down for you more but unfortunately without proper diagnosis and running through all those checks...I can only give you my thoughts on things i would check...
I got a 01 Ford Expedition that makes that same noice when I hit the gas ima check that tomma
Unless someone put an old engine and fuel delivery system, the 2001 Ford won't have a carburetor. 2001 is already fuel injection. This adjustment wouldn't be available in your set up
I have that same issue but only happens in drive while accelerating on my tpi 350 Chevy corvette, can’t figure out the issue , but I’m gunna check the throttle body again after watching this. But if it doesn’t work , would u have a suggestion for me??
Tbi corvette? I would suggest paying a very close eye at your injectors to see if maybe you have one that is slightly restricted
@@EddiesCustomsandRestorations thanks for the recommendation, will do this , would this still be possible after I switched out all 8 injectors for New ones?? Cuz I have heard/noticed that like 3 injectors open and close very softly while the rest could easily be heard when direct contact with screw driver
@@darkgodarx3009 sometimes, althought new, we can end up with faulty injectors...
If this is happening on a new EFI car, is it the throttle body likely sticking open?
Not enough fuel more than likely.
My tbi has a similar problem runs great at 1st but starts bogging once I come to accelerate after a stop. It even backfires and shuts off.
The flathead screw feel like it’s free spinning and it doesn’t seem to be giving any tension to the flap
You need to turn and hold and keep turning and holding till it creates tension.
Thanks
I have the exact same problem on a electronic fuel injection engine. Any idea ?
Check fuel filter make sure its not clogged and getting loss of fuel, check air filter, make sure your air intake hoses are all hooked up and not torn. A vacuum hose being cracked or torn can also cause this
So just 1-1/2 turns and call it good? Is there room for performance tuning for different applications?
I think that's too tight. He probably "fixed" the bog, but those secondaries aren't going to work.
If you race often you want them loose for instant hits. Too loose and they'll bounce back and forth and kill all performance. You have to balance it to what your engine likes and what your driving likes.
There's a guy on RUclips that all he does are Quadrajet videos. He has good info. I can get his name if you need.
My car shows code for catalytic converter I replaced the converter and o2 sensor but it still does when I stop and give it gas it's not showing any codes what so ever but catalytic converter
clean throttle body, make sure there is no holes in your intake tube etc.
I have a 383 stroker that will start and run down the road then will die. Have to let it sit a few mins and it starts runs then dies again. Any ideas?
@@KB19910 check your spark plugs, if they are all black and fowled out replace them. Also if you have a clear fuel filter, check to see if you are getting fuel to the carb when this happens
Pulled my air filter annnd the plates gone, just a couple sheared off screws ona bar, darn.
Daaaam!
S420 giving me thee similar problem
Fuck yeah. Good explanation. What if it Boggs at around 30 mph? Is it the same fix?
just a tid bit for some folks “FORD” ran Quadrajet carbs. on some of their H O engines from tha factory 😎
My 85 gmc doing same thing
Need help. My 77 Buick won't start unless I'm under the hook with the gas wide open but then it spits and has a vary long start up
If you have to floor the gas in order to start it your car is flooding and also bad plugs or fowled plugs will do that as well
@@EddiesCustomsandRestorations I just replaced the plugs. Could it be rich?
@@kevecollins5267 definitely running rich causing it to flood. What carb are you running?
@@EddiesCustomsandRestorations its an OEM 2 bbl I have a 77 Buick 350 the carb is new. Idle changed when I adjusted the mixture screws from a high idle to a low more smooth I think idle. Is that lower idle good?
@@kevecollins5267 so here is the thing with carbs. A carb can sound like its running ok and still be set incorrectly. Without a lot of experience with carbs it may be very difficult to get this down correctly. I recommend getting a vacuum guage and setting it with the vacuum guage
Could open manifolds also cause this?
You will hear it more with open manifolds yes but it will be more of a consistent pop more like on deceleration
They must have changed that screw from Allen key to torx???
Well the torx works lol
Hello what to do if it's stuck open?
Something should be holding it. If its just seized I would recommend adding some WD40 to the pivot points and tapping back and fourth to try to shake it loose. But gently so you don't bend the flap
@@EddiesCustomsandRestorations thanks I will try that. It is stalling on me when press the gas pedal
That happens to me wen go full throttle but if I don’t steep on it it won’t do it
May need to adjust your accelerator pump.
Is this on all carburetors 🤔
Just the ones with the secondary flap like this like the quadrajets
Got the same problem but not the same carb its only 1 flap
Look up how to adjust accelerateor pump. It may be too lose.
I notice there was a vacuum hose disconnected.
That will do it too lol
U just fix my 4.3lx mercruiser that was doing this lol
Thats awesome!!!
My bad for hitting you with an insane amount of questions man.
Oh no problem! Just trying to help a fellow car guy
It’s called aquadrabog for a reason.
Timeing needs set
Lolz that sound like my 79 dodge
Its a disservice to searchers when you use wot in that way
Yep spray and pray, solves most problems
Bruhhhh. I'm an idiot....the spring isn't attached to the damn metal rod underneath 🤦🏻♂️
Lol wow. Sometimes its the simplest things that we miss lol
@@EddiesCustomsandRestorations lmfao. Right. Ive been raising ten shades of hell...for a spring. Lmao
@@chuckvalhallen 🤣🤣🤣🤣 but you atleadt got it now!
@@EddiesCustomsandRestorations truuuuuuu
the secondary air doors open too fast and cause the engine to lean out. you can change the secondary fuel rods to get a fatter mixture and that gets the bog out. when the secondary air doors open fast, they lift the fuel metering rods with it. it leans out from too much air and not enough fuel. you can still achieve the right balance of air fuel mixture at wide open throttle
OR you can just tighten that little spring like this guy says and be done with it.
Fucking life saver than you !!!!
Youre very welcome 🙏 hope I earned myself a new subscriber lol
lol now my c10 wont run AS shitty
Sweet!!! Lol
The best way to fix that piece of junk is to throw it in the trash. That is by far the very worst excuse for a 4brl carburetor that I have had the displeasure of dealing with. And yours looks new like a replacement. And there you go!
blaaaaaaaah
only cause i didnt see anyone else do it😂
@@tristant69 🤣🤣🤣 I was waiting for that lol 😆
revv up ur enginessssssssss
Lol scotty
@@EddiesCustomsandRestorations couldnt help it man lol.
@@Eye_4_An_Eye lol that was a good one tho!
Bahhhhgahhhh 🤣
🤣
First problem is it is a 77 Crapvette, next problem is the quadrajunk. If you're a Chevy guy, sell it and get a 1st gen Camaro. Similar price, twice the car
I've had 3 69 camaros lol love them! Now have my 1970 chevelle