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  #1  
Old Aug 13th, 07, 10:16 AM
Jimmyhotrod Jimmyhotrod is offline
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Default Hard starts with Edelbrock Carb

When my small block chevy motors are cold they both need very few cranks to get started, but when they get hot it takes two or even three tries. Any ideas??? Both motors run fantastic with great response.
Both motors have the exact problem and both have Edelbrock 600 carbs with electric choke.

Things I already thought of:

1. Fuel line is as far away from heat as I can get it.
2. If I start it as if it's flooded and hold the pedal to the floor and let off as soon as it fires, it'll start quicker.

Thank you for any suggestions!
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  #2  
Old Aug 13th, 07, 10:40 AM
Jesse66Original Jesse66Original is offline
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Default Re: Hard starts with Edelbrock Carb

I also have run a few Edelbrocks on both SB and BB's, I found out early on my GM 350 Crate that it would not start good when it was hot. I believe you may find that what happens when you shut it off hot and leave it for a while the fuel percolates (spelled wrong) out of your carb, Edelbrock mades a insulator spacer they call it for this reason, it is .0320 thick if my memory serves me correctly. Worked good for me. Let me know if you are intersted and I will dig up the PN# for you.

Jesse
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  #3  
Old Aug 13th, 07, 1:31 PM
Jimmyhotrod Jimmyhotrod is offline
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Default Re: Hard starts with Edelbrock Carb

Thanks Jesse. Please find the Part # for me. It's worth a try.
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  #4  
Old Aug 13th, 07, 1:37 PM
bochnak bochnak is offline
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Default Re: Hard starts with Edelbrock Carb

Is this true imediately after shutting down when engine is hot/warm? Or after say 15 minutes?
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  #5  
Old Aug 13th, 07, 2:00 PM
bbm bbm is offline
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Default Re: Hard starts with Edelbrock Carb

I use a Holley PT# 108-70 heat shield kit.
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  #6  
Old Aug 13th, 07, 3:10 PM
Tom Mobley Tom Mobley is online now
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Default Re: Hard starts with Edelbrock Carb

betcha this problem goes away when the weather cools off. We get a bunch of posts similar to this every summer.

Cheap gas will often boil easier than good gas, what gas are you using?
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  #7  
Old Aug 13th, 07, 3:19 PM
steve70malibu steve70malibu is offline
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Default Re: Hard starts with Edelbrock Carb

There are two lessons I learned about the edelbrock carbs.

1 - use a premium fuel filter, the smallest particles cause problems!

2 - use a heat insulator/spacer, fuel boils in the bowls easily!

Steve
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  #8  
Old Aug 13th, 07, 3:38 PM
Stikman33 Stikman33 is offline
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Default Re: Hard starts with Edelbrock Carb

Used to have a similar problem on my edelbrock 1406. Reason being because the fuel actually sits inside the main body of the carb, immediately in contact with the intake almost. So some sort of heat spacer is a good investment. I used a phenolic spacer on mine that worked great.
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  #9  
Old Aug 13th, 07, 4:59 PM
Jimmyhotrod Jimmyhotrod is offline
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Default Re: Hard starts with Edelbrock Carb

Thanks for the ideas. I'm thinking an insulator/spacer is worth trying out. I know it's not the quality of gas, because I burn premium or better in both engines. And, the problem with starting is after the carb sits on top of the hot motor for about 15-30 minutes.

Thanks again,
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  #10  
Old Aug 13th, 07, 9:43 PM
Jesse66Original Jesse66Original is offline
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Default Re: Hard starts with Edelbrock Carb

Jimmy,
The PN# is 9266 made by Edelbrock. I should have ask you what type
intake you are running. This PN# has a divider in the center which allows for use on divided-plenum Performer style manifolds, there is another PN# for the open center Insulator. These PN#'s can be found in a Jegs Book also. Hope this helps. Also it is 0.300" thick. I believe it will do the trick for you.

Jesse
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  #11  
Old Aug 13th, 07, 9:55 PM
zeke67 zeke67 is offline
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Default Re: Hard starts with Edelbrock Carb

I concur with what has been said. The smaller fuel volume, the aluminum casting and the close proximity to the intake of the Edelbrock cause more rapid heat soak and fuel percolation. Mine does the same thing, haven't gotten around to the heat spacer gasket yet.
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  #12  
Old Sep 5th, 07, 2:31 AM
Cable Cable is offline
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Default Re: Hard starts with Edelbrock Carb

I just installed a 1406 tonight on my K5 (350) and I have to hold the pedal to the floor to get it started. It doesn't matter if it is cold or warmed up. After it is running the engine idles smooth as glass. If I turn it off, even for a second, I have to hold the pedal to the floor a crank on the starter for a few seconds before it will start.

When it was running at idle I had to set the mixture screws to 1.5 turns from the seat to get max vacuum of 16". Off idle throttle response is great, runs like a champ when running.

I had a Q-Jet on it and it ran fine except I need an electric choke because my wife can't keep it running for anything when cold. I'll buy another Q-Jet in the future, but in the meantime I need to fix this thing ASAP.

Could the electric choke or linkage cause any problems like these? Ideas?

Thanks guys.
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Last edited by Cable; Sep 5th, 07 at 3:04 AM.
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  #13  
Old Sep 5th, 07, 10:49 AM
69chevelleX2 69chevelleX2 is offline
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Default Re: Hard starts with Edelbrock Carb

In my opinion, i would say..Check your timing, my uncles Suburban with a 383 stroker and a edelbrock carb, had that problem too, took it to about 3 different places to get it timed right, and nothing, till i went over there and fixed the timing for him, also check your valves, make sure they are not open or closed too much.
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  #14  
Old Sep 5th, 07, 12:21 PM
Cable Cable is offline
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Default Re: Hard starts with Edelbrock Carb

Quote:
Originally Posted by 69chevelleX2 View Post
In my opinion, i would say..Check your timing, my uncles Suburban with a 383 stroker and a edelbrock carb, had that problem too, took it to about 3 different places to get it timed right, and nothing, till i went over there and fixed the timing for him, also check your valves, make sure they are not open or closed too much.
Normally I would completely agree with you as a good place to start. However, I went from the Q-Jet that fired up without any problems to the Edelbrock and starting having issues in a matter of 15 mins, no other changes. The timing wasn't touched. It is set at 10* initial btw.


Thanks anyway.
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  #15  
Old Sep 5th, 07, 4:48 PM
canuck canuck is offline
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Default Re: Hard starts with Edelbrock Carb

I had this same problem on my 79 C20 pickup. It was hard to start when it was warm and it would stumble when sitting at a intersection for more than 20 seconds. I put the thick isolator gasket from a local parts store and most of my issues have gone away. The truck does not stumble and stall anymore and the hard starting when warm have gone away. Unfortunately, until I figured this out I was monkeying with the metering rods to try and solve it now I have to take it apart again. Thank god for notes.
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