Re: Edelbrock of idle stumble 440 engine
[Re: fury4speed]
#2178178
10/18/16 10:55 PM
10/18/16 10:55 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
what's the initial? ported or manifold? Is AP tip in immediate/adequate volume? does it do it when fully warmed up? idle vacuum? what springs are in there? float level at 7/16 or slightly lower (richer)? they (the 1406) are lean & I would purchase the strip kit
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: fury4speed]
#2178319
10/19/16 01:17 AM
10/19/16 01:17 AM
|
Joined: Jan 2003
Posts: 25,858 Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,858
Rio Linda, CA
|
IMO, off-idle stumble is the hallmark of the Edelbrock...running the idle mixture a little over-rich helps more than the other solutions.
The INTERNET, the MISinformation superhighway
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: TJP]
#2178518
10/19/16 01:03 PM
10/19/16 01:03 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
see if you have a "square" or very close to that
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: dogdays]
#2178752
10/19/16 08:32 PM
10/19/16 08:32 PM
|
Joined: Mar 2006
Posts: 9,848 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,848
MI, usa
|
Also begin saving your pennies and dimes for a different carb. At least half the 750 Edelbrocks out there have a pretty incurable stumble. They are famous for this.
When the inevitable post comes along after me saying "I run 10s with my Edelbrock 750" you can sell yours to him. It never fails. During the time that I was buying carburetors from Ebay I noticed that the 750 Edelbrocks were selling for less.
R. Does yours run 10's with a Holley? Just wondering. Nothing is incurable, just hasn't had the correct fix applied. If the car stumbles it's either rich or lean at the hit. Determine which it is and correct the issue. Doug
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: fury4speed]
#2178881
10/20/16 12:04 AM
10/20/16 12:04 AM
|
Joined: Mar 2006
Posts: 9,848 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,848
MI, usa
|
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: p d'ro]
#2179102
10/20/16 12:59 PM
10/20/16 12:59 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
But when I stomp on the gas it goes completely flat/lean for a sec, then must get a burst ofgas and goes balls out.. I'm sure you've checked this but is the AP tip in immediate upon the slightest throttle movement? & of good duration and are you on ported for the vac can?
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: RapidRobert]
#2179111
10/20/16 01:11 PM
10/20/16 01:11 PM
|
Joined: Dec 2007
Posts: 1,584 MD
p d'ro
pro stock
|
pro stock
Joined: Dec 2007
Posts: 1,584
MD
|
But when I stomp on the gas it goes completely flat/lean for a sec, then must get a burst ofgas and goes balls out.. I'm sure you've checked this but is the AP tip in immediate upon the slightest throttle movement? & of good duration and are you on ported for the vac can? Yeah, my issue may be diff. than the ops. I saw a good stream of fuel before in carb before I changed the AP and squirter. I moved to teh closest hole to airhorn with no help. I have a vacuum secondary casrb. Vacuum is high at idle at 21. Hopefully the op can lessen his issues with timing and A/F. There are just so many threads all over the internet with this issue and that these carbs aren't meant for modified engines..
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: p d'ro]
#2179126
10/20/16 01:34 PM
10/20/16 01:34 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
I would see what the squirt looks like in your driveway at the offending RPM that it does it out on the road. You wouldn't be under a load but it might show something, it has to be lean for a reason & you'd think it'd be a reasonably easy thing to pin down. my 1406 needed richening (rods/jets) & would bog cuz the choke came off to quick (& I'm talking normal driving
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Edelbrock of idle stumble 440 engine
[Re: p d'ro]
#2179168
10/20/16 02:41 PM
10/20/16 02:41 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
It's done all the time. I don't think the bungs cost more than a couple $$.
The O2 sensor on gasoline engines has an 18mm x 1.5 thread same as a spark plug. People have used spark plug "de-foulers" with the externally threaded part cut off.
What my car runs or doesn't run is off the subject. The OP is having problems which sound so familiar, there must be 1000 different posts about this issue. The ironic thing is, most street cars that can run 10s have a 3000+ stall speed torque converter. This means that the engine never sees the condition plaguing the half of 750 Edelbrocks that have the stumble, except maybe on the drive back to the pits.
When I wanted a big Edelbrock I took AndyF's advice and bought an 800.
R.
Last edited by dogdays; 10/20/16 02:49 PM.
|
|
|
|
|