NEw Carb Prolbems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orange72350 · 01-04-2004, 04:36 AM

I installed an edelbrock 1406 carb on my 350. the engine in the sig. problem is, it ran nice at idle, but under load it runs rough. it has a stumble off idle, and doesnt want to hold an idle when hot. the screws are adjusted about 2 turns out, where they seem to run best. I dunno what the manual says about it, cause that is all greek to me. i really have no idea what goes on. the problem does seem to go away at higher rpms. any suggestions?
thanx
daler

Jerdog · 01-04-2004, 04:52 AM

If you bought the carb new it came with a manual that gives all the specs. to make it work correctly. Mine only needed minor adjustments to make it run fairly good. To make it run great I changed the needles and the springs under the needles. The manual explained exactly what to look for and how to fix it. In short read the manual its easy.

Bill72BB · 01-04-2004, 05:04 AM

Need to ask some questions.
Did you hook the electric choke to 12 v when the key is turned on ?
Hei or Stock distributer?

orange72350 · 01-04-2004, 11:59 AM

hei.yeah, i hooked it to a key on power source. i looked at the manual, and its all gibberish to me. its damn cinfusing

cdowns · 01-04-2004, 01:00 PM

if you can't understand the manual you might be better off tacing it to a professional and have it done correctly

Jerdog · 01-04-2004, 01:53 PM

Orange, do you have an external tach or vacume guage? Or at the very least a really good ear. If so I'll walk you through setting up the idle portion of the carb. Once you get that then you can tackle the other areas

Bill72BB · 01-04-2004, 02:04 PM

Hei, OK
Which vacuum port on the carb do you have the vacuum advance hooked up too.
Looking at the carb the Left side is the ported advance ( HEI ) . The Righrt side is non-ported ( Manifold Vacuum all the time )
Both will work if you are on the (Hei) Left side try switching to the other side and see if it makes a difference. Make sure you plug the side you aren't using.l

Also when the engine is Hot is the choke butterfly fully open ?

oldsub86 · 01-04-2004, 02:10 PM

I have one of those carbs on a Ford 302 and have suffered some difficulties as well. It runs too rich and I assume I may need to change some parts. One suggestion however, is to pull the top and check the float levels. Mine were way off right out of the box. One side was much different than the other.

jef5150 · 01-04-2004, 02:18 PM

http://www.edelbrock.com/automotive/...ubleshoot.html http://www.edelbrock.com/automotive/eps_intro.html

71chevylongbed · 01-04-2004, 03:40 PM

the easiest and best way i have found is to take it to a pro and have them tune it with their gas analyzer

01-04-2004, 04:36 AM	#1
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	NEw Carb Prolbems I installed an edelbrock 1406 carb on my 350. the engine in the sig. problem is, it ran nice at idle, but under load it runs rough. it has a stumble off idle, and doesnt want to hold an idle when hot. the screws are adjusted about 2 turns out, where they seem to run best. I dunno what the manual says about it, cause that is all greek to me. i really have no idea what goes on. the problem does seem to go away at higher rpms. any suggestions? thanx daler __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

01-04-2004, 05:04 AM	#3
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	Need to ask some questions. Did you hook the electric choke to 12 v when the key is turned on ? Hei or Stock distributer? __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

01-04-2004, 11:59 AM	#4
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	hei.yeah, i hooked it to a key on power source. i looked at the manual, and its all gibberish to me. its damn cinfusing __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

01-04-2004, 01:00 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	if you can't understand the manual you might be better off tacing it to a professional and have it done correctly __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-04-2004, 02:04 PM	#7
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	Hei, OK Which vacuum port on the carb do you have the vacuum advance hooked up too. Looking at the carb the Left side is the ported advance ( HEI ) . The Righrt side is non-ported ( Manifold Vacuum all the time ) Both will work if you are on the (Hei) Left side try switching to the other side and see if it makes a difference. Make sure you plug the side you aren't using.l Also when the engine is Hot is the choke butterfly fully open ? __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

01-04-2004, 04:52 AM	#2
Jerdog Registered User Join Date: Feb 2003 Location: Bakersfield, CA Posts: 38	If you bought the carb new it came with a manual that gives all the specs. to make it work correctly. Mine only needed minor adjustments to make it run fairly good. To make it run great I changed the needles and the springs under the needles. The manual explained exactly what to look for and how to fix it. In short read the manual its easy.

01-04-2004, 01:53 PM	#6
Jerdog Registered User Join Date: Feb 2003 Location: Bakersfield, CA Posts: 38	Orange, do you have an external tach or vacume guage? Or at the very least a really good ear. If so I'll walk you through setting up the idle portion of the carb. Once you get that then you can tackle the other areas

01-04-2004, 02:10 PM	#8
oldsub86 Registered User Join Date: Dec 2002 Location: Canada Posts: 695	I have one of those carbs on a Ford 302 and have suffered some difficulties as well. It runs too rich and I assume I may need to change some parts. One suggestion however, is to pull the top and check the float levels. Mine were way off right out of the box. One side was much different than the other. __________________ 1968 Chevy - 292 with a powerglide

01-04-2004, 02:18 PM	#9
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	http://www.edelbrock.com/automotive/...ubleshoot.html http://www.edelbrock.com/automotive/eps_intro.html

01-04-2004, 03:40 PM	#10
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	the easiest and best way i have found is to take it to a pro and have them tune it with their gas analyzer __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

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