edelbrock problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt69 · 03-20-2003, 12:14 AM

i just put a rebuild edelbrock 1405 carb on my truck found out that it was missing metering rods and primary jets got new ones and it still doesn't run correctly because i can close both idle screws and it doesn't change anything. any suggestions of what i should look for or replace.

Longhorn Man · 03-20-2003, 12:57 AM

Closing the screws will not stall these carbs out.
Turn the screws one at a time and in very small incraments to achieve the highest vacume reading.

67_SS396 · 03-20-2003, 03:02 AM

If you turn the adjustment screws in and there is no change, then there is a problem. Possibly a bad float level or trash in the carb. You should be able to have a starting point of having both screws turned out 1 1/2 turns. Turn them in until the engine starts to stumble, then back out 1/2-3/4 turn. If you turn the screws all the way in, it should almost if not kill the engine. If not, then the carb has issues.

matt69 · 03-20-2003, 08:26 AM

if i dont move the screws at all eventually the engine will stall. and i know the float level is correct but if there was a lot of stuff in the carb could that be clogging the jets.

**Bernie** · 03-20-2003, 10:55 AM

I had that with a new Edelbrock 1406. The adjuster screws had no effect at all. It turned out that the timing was way out.

lukecp · 03-20-2003, 02:21 PM

A good starting place for tuning the idle is to turn both screws all the way in, then back them out two turns.......

Longhorn Man · 03-21-2003, 12:41 AM

Also somethign i forgot, these things are very sensitive to low vacume engines. If you aren't pullin much vacume, then you'll need to swap to lighter springs.
You can get all the trouble shooting and specs at there site.

Yellow Cheyenne · 03-21-2003, 03:55 AM

On my 1406 I found that a slight throttle linkage bind didn't allow the accelerator to go all the way against the idle stop. It held the throttle plates slightly open, which would not allow the idle set screws to adjust correctly.

03-20-2003, 12:14 AM	#1
matt69 Registered User Join Date: Nov 2002 Location: spring lake, mi Posts: 58	edelbrock problems i just put a rebuild edelbrock 1405 carb on my truck found out that it was missing metering rods and primary jets got new ones and it still doesn't run correctly because i can close both idle screws and it doesn't change anything. any suggestions of what i should look for or replace. __________________ 69 lwb fleetside, 307 2wd

03-20-2003, 03:02 AM	#3
67_SS396 Registered User Join Date: Mar 2000 Location: Blue Ridge, Tx Posts: 1,172	If you turn the adjustment screws in and there is no change, then there is a problem. Possibly a bad float level or trash in the carb. You should be able to have a starting point of having both screws turned out 1 1/2 turns. Turn them in until the engine starts to stumble, then back out 1/2-3/4 turn. If you turn the screws all the way in, it should almost if not kill the engine. If not, then the carb has issues. __________________ Fawker Fab three seater rock crawler buggy 498 BBC/SM465/203/205 doubler, propane, 5.13's, 42" PB Rockers '66 C10 - The new hot rod '77 3+3 Dually - 12 valve 4wd conversion tow rig project '28 Ford 2 door sedan street rod RevLimit Offroad "Hang on beer, we can do this."

03-20-2003, 08:26 AM	#4
matt69 Registered User Join Date: Nov 2002 Location: spring lake, mi Posts: 58	if i dont move the screws at all eventually the engine will stall. and i know the float level is correct but if there was a lot of stuff in the carb could that be clogging the jets. __________________ 69 lwb fleetside, 307 2wd

03-20-2003, 10:55 AM	#5
Bernie Senior Member Join Date: Jan 2001 Location: Northern Illinois Posts: 516	I had that with a new Edelbrock 1406. The adjuster screws had no effect at all. It turned out that the timing was way out. __________________ Bernie

03-20-2003, 02:21 PM	#6
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	A good starting place for tuning the idle is to turn both screws all the way in, then back them out two turns....... __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

03-20-2003, 12:57 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Closing the screws will not stall these carbs out. Turn the screws one at a time and in very small incraments to achieve the highest vacume reading.

03-21-2003, 12:41 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Also somethign i forgot, these things are very sensitive to low vacume engines. If you aren't pullin much vacume, then you'll need to swap to lighter springs. You can get all the trouble shooting and specs at there site.

03-21-2003, 03:55 AM	#8
Yellow Cheyenne Registered User Join Date: Jun 2001 Location: Eastern Kansas Posts: 488	On my 1406 I found that a slight throttle linkage bind didn't allow the accelerator to go all the way against the idle stop. It held the throttle plates slightly open, which would not allow the idle set screws to adjust correctly. __________________ '72 Cheyenne. AC, PS, PB, Rear slider window, tilt. Light yellow (grapefruit yellow according to new sales literature from '72) '56 Chevy short step V-8 (My dad bought it new!!) '70 Olds 442 convertible '70 Olds Rallye 350



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