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#1 |
Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Flooding at Cold Start, Edelbrock 1407 on a 383
I'm hoping someone can point me in the right direction. Here's the problem and the pertinent background:
383, 10:1 compression, dynoed 420 HP and 450 tq, it's this motor here: new motor. I have a new Edelbrock 1407 that I put an electric choke kit on. When it's cold outside and the motor is cold the motor floods badly upon start up. To start, I hit the gas once to engage the choke and then start it. It'll stumble for a few seconds and stall. Crank it again and it stalls again. Suddenly, it's flooded. If i'm lucky enough to get it to run, the choke is functioning properly. The mixture screws are set correctly (when warm) and the timing is 14*. When I had the smaller 600 carb on, none of this happened. I've checked the float height, it's fine. I put on a fuel pressure regulator, it's 5.5 psi now. Any ideas?
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69 Driver - The Analog Truck |
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#2 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
If there's no leakage into the intake when sitting and it starts up and runs okay when engine is warmed up, then everything points to the choke adjusted to tight.
With engine completely cold, adjust the choke so that it just starts to open, and then slowly adjust it so that it just closes. If that doesn't do it for you and it still flood badly, then the choke is defective. Can't think of anything else at this time.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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#3 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
After cold start up my Edlebrock choke will not open until I blip the throttle once. It does not have a normal choke pull off like a Qjet. I gather it is supposed to have some kind of internal vacuum operated choke pull off but I haven' t figured it out yet. When I start it, I let it blubber for about 2 seconds, blip the throttle to let the choke open 1/4" and it will sit and idle like it is supposed to. This is the only time I miss my Qjet but I have put up with it for 4 years now. Just a minor annoyance. If you aren't blipping your throttle after start up, then I don't see how your choke is supposed to open. Watch it next time you start it.
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#4 | |
Registered User
Join Date: Jun 2014
Location: Connecticut
Posts: 521
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
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#5 | |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,606
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Quote:
2. Lower your pressure to 4psi. 3. Increase your high idle speed to 1200 rpm. 4. Maximize your timing curve. As much initial as possible. |
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#6 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
I agree ^^^
Plus that thing will like a lot more initial timing. Gary
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#7 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Lots of good advice....no argue, but I would like to add to the mix? Let us talk about timing....12- 14 initial, usually gets you into the spot? However, I like to focus more on the TOTAL @ 2800-3000 rpms, then set the vac timing(manifold source) @ idle, to 10-12 @ the crank. Understand that the vac timing drops out , under full throttle @ is used as a low rpm /part throttle crutch. Focus on the TOTAL timing, & all in spot.....I don't like to be past 34-35 degrees on a pump fuel street mill....on the track, with good fuel....around 38 degrees (no vac advance)? Longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#8 |
Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Just a follow up to what I figured out because I ran across half a dozen issues like mine on various message boards and no one ever posted their solution!
First, I had the choke closed too much. When I installed the electric choke I was off by 120 degrees. That didn't cure my problem though, but it contributed. Second, I installed a fuel pressure regulator. My mechanical pump was putting out crazy pressure. Third, I verified that the floats were adjusted correctly. Fourth, and this is what did it: I put in two steps leaner primary jets and the matching metering rod according to the manual from edelbrock. I swapped the springs to match the vacuum created by my engine. I went one step richer on the secondary jets. Now it still does a little coughing when cold, but I can drive it without issue. ![]()
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69 Driver - The Analog Truck |
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#9 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,606
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
And what did you set the timing at?
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#10 |
Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
The timing is still at 14* initial. I didn't believe that was the issue because it ran great with the other carb.
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69 Driver - The Analog Truck |
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#11 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,606
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Is it a verified 14 degrees?
Have you proved your timing tab/balancer are spot on? http://www.crankshaftcoalition.com/w...op_dead_center Have you tried more initial? |
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#12 |
Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
No, never verified it. It's running good now though.
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69 Driver - The Analog Truck |
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#13 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Good to hear that she is working for you
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#14 |
Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
Like Jaws 2 ... just when you thought it was safe to go back in the water...
This morning the truck wouldn't start. The weather's been stable, that's not the issue. I pull the air cleaner and see the choke wide open. I check and it's not bound up with anything. The alignment marks are the same, too. I readjust the choke so it's barely open and try to start the truck. It's too late, the truck is already flooded. Plugs are fouled. Then, I realized one of the problems...the ignition switch is so worn out on the truck that sometimes the switch is left on when the key looks off. There was power to the choke all night. I didn't check it, but I'm pretty certain it was warm.
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69 Driver - The Analog Truck |
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#15 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Flooding at Cold Start, Edelbrock 1407 on a 383
If the choke was wide open (and normally it works fine), I'd say it is very plausible that your key was on all night.
On all of my old vehicles that do not already have an oil pressure light, I wire one up. So if I leave the key on without the vehicle running, I have a big red light in my face that comes with the added bonus of verifying oil pressure. Might be something to consider.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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