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#1 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Quadrajunk
well the 1406 edelbrock 600 on my truck is pretty much garbage. it barely idled, bogged like no other, and had real bad pickup. im tight on cash so i figured id try out the stock quadrajunk on my edelbrock intake.the rest of the motors pretty much stock except exhaust. it started kinda rough but seemed to run better all in all. it doesnt bog anymore when i craack the throttle but it idles very high. i had the screw backed all the way out, and it still idled high. i sprayed all over for vaccuum leaks but didnt find any. maybe i have a vacuum line on wrong somewhere? im not to firmiliar with these things but any tipe on how to tune them? and i think my timings off a little. any tips? thanks
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#2 |
3/4 Ton Rodder
Join Date: Jan 2009
Location: Manlius, IL
Posts: 1,146
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Re: Quadrajunk
Make sure the throttle isn't sticking anywhere and make sure the choke is working properly.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
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#3 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
its not sticking
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"I'll keep my guns, money, and freedom. You can keep the "change" |
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#4 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: Quadrajunk
Make sure the high idle cam is not stuck, I don't know if this applies to your engine (no info) but if the vacuum advance is hooked to the wrong port it could idle higher than normal.
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#5 |
Registered User
![]() Join Date: Feb 2009
Location: Scottsdale, AZ
Posts: 390
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Re: Quadrajunk
Verify the timing and go from there.
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#6 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
how do i know exactaly how to set the timing? i always just played with the distributor until it sounded good.. and the vac advance is hooked on in the bottom left side port in the front (looking at the motor from the front of the truck) i have my brake boost on the back, and the pcv in the front bottom middle. everything else is capped
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"I'll keep my guns, money, and freedom. You can keep the "change" |
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#7 |
Registered User
![]() Join Date: Feb 2009
Location: Scottsdale, AZ
Posts: 390
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Re: Quadrajunk
Seriously? You need a timing light.
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-Don- '66 ![]() '77 ![]() '80 ![]() '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf ![]() |
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#8 |
Registered User
Join Date: May 2009
Location: phoenix AZ,NOW ON THE DIRTY EAST SIDE IN THE MIDDLE OF THE BAD WEST AND THR RICHICHY SCOTTSDALE
Posts: 39
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Re: Quadrajunk
i dont know if u have egr valve but when they cant hold vaccum and dont open the engine revs high and that throws off timming if thats broken thats a therory of mine i might be wrong
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#9 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
100% serious. i wouldnt be asking on here if i knew. and theres no egr on the motor
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"I'll keep my guns, money, and freedom. You can keep the "change" |
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#10 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: Quadrajunk
Sounds like the advance is on the right port, Could be the welch plugs on the bottom of the float bowl seeping fuel/a worn throttle shaft or a higher than spec float/fuel level.
Did you install a new base gasket when you swapped carbs ?
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93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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#11 |
optomistic ah-so
Join Date: Mar 2009
Location: Charlotte, NC
Posts: 544
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Re: Quadrajunk
My usual first step before bolting any carb on is rebuilding it using settings appropriate for the application.
There are slots in the primary barrels of the Q-Jet, by the throttle blades, that should only be partly covered at idle...but the first step in making sure this is happening is setting everything one the carb right. If it is right and the throttle linkage rod is adjusted a little short, like for a different carb, then the throttle blades are never reaching idle position. You'll never know which is which unless you have a known quantity, like knowing the carb is set right. If your Edelbrock manifold is just a Performer (low-rise dual plane) then restoring the stock settings should be a great starting point. It's not an electric feedback Q-Jet, is it?
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#12 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
It's not an electric feedback Q-Jet, is it?[/QUOTE]
not sure. idont think so. theres no wires goin to it.. its not a performer but it is a low rise and yea i used a new gasket. it doesnt leak any at the manifold
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#13 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: Quadrajunk
Cover the front side of the carburetor with your hand. If you can not feel much if any air pulling past your fingers then you probably need a different base gasket.
I just went through this on Sunday. I was having problems with the Edelbrock 1406 on my engine and decided to put the bigger 750 Demon carb off my Camaro onto it. I couldn't get it to idle below 2000 rpm. Switched base gaskets and all is well. |
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#14 | |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
Quote:
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#15 | |
Registered User
Join Date: Aug 2009
Location: hillborough nc
Posts: 410
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Re: Quadrajunk
Quote:
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77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin 79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s 81 mercedes 300d 25 MPG 77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded" 73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091 '77 chevy trucks. built to stay tough. life is short build a hot rod ![]() |
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#16 | |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: Quadrajunk
Quote:
I forgot to take pics of the trimmed heat shield but I will get some this weekend. I still need to adjust the air/fuel mixture and set the idle. |
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#17 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
so my choke wasnt opening all the way. i overlooked a stupid fuse. now it opens all the way and i put a higher flow air cleaner on it. now it seems harder to start...its my DD so i need to figure something out here fast cuz now its got a choppy idle and it sounds like its going to die. any suggestions? could something be wrong in my distributor to make it miss like it is?
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#18 |
Registered User
Join Date: Aug 2009
Location: hillborough nc
Posts: 410
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Re: Quadrajunk
and another thing is your carb adjusted right? look on my stock q jet the best setting is turn you idle mixture screws all the way in and then 2 and 1/2 turns out on both sides and adjust according so if its lean at top end give it another 1/4 to 1/2 turn on both
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77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin 79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s 81 mercedes 300d 25 MPG 77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded" 73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091 '77 chevy trucks. built to stay tough. life is short build a hot rod ![]() |
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#19 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
is the a/f ratio the only adjustment u can do to these things?
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#20 |
Registered User
Join Date: Mar 2007
Location: Farmington, MN
Posts: 928
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Re: Quadrajunk
you change the air cleaner so now you have more air available to the carb and may need to adjust the carb for that.
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#21 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: Quadrajunk
^^ I agree. Something as simple as that can cause a lean condition that creates all kinds of tuning and drivability issues.
The stock snorkel air cleaner is very restrictive so the open element air cleaner allows a huge increase in air available to the engine. My old one was necked down so far it only had only about a 1-1/2" diameter opening that all the air had to pass through. |
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#22 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
thanksguys. today i got so fed up with the carb after me and a few freinds played with it that i swapped it for a 1403 edelbroct 500cfm. i thought it woulld be too small but it runs great now. and i got the timing set. now it runs awesome but it never just stops there, now when the trucks hot, it wont turn over... its been doing this for a while but it would at least start after a few seconds, now it turns over so slow it wont fire. but when its cold its fine. is it my battery? starter? alternator? my first thought was my starter but i could be wrong.. and suggestions?
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"I'll keep my guns, money, and freedom. You can keep the "change" |
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#23 |
Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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Re: Quadrajunk
starters are notorious for heat. because the exhaust is right there. get a starter heat shield and it should be good.
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#24 |
Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: Quadrajunk
so keep the starter i got? or just get a new one and a sheild?
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"I'll keep my guns, money, and freedom. You can keep the "change" |
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#25 |
Registered User
Join Date: Aug 2006
Location: Feather River Canyon, N. Calif
Posts: 89
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Re: Quadrajunk
Timing. Really, get that timing set solid and it will crank fine.
Jim P |
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