hard starting with new Edelbrock when warm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

D-Rat · 04-21-2010, 12:36 PM

The 1406 on my 400 makes cold starts a breeze...fires up on the first crank every time. The problem is when the truck is warm, it doesn't like to start and usually requires me to pump the gas pretty good while turning the starter. Eventually it catches.

What do I need to adjust? The carb is brand new and unaltered. Let's assume timing is fine becuase this was not an issue with the previous carb, though it did have other issues.

I'm also down on "stab it" power compared to the 730CFM Holley I took off. Ideas?

I'm not crazy about rejetting, etc., as I've never torn one of these down, but if that's the only option, well...

Tkmadone · 04-21-2010, 01:09 PM

Sounds too rich. Next hot start don't pump it, just hold the throttle half open and crank. If it starts right up then you are definitely too rich.

71tahoe · 04-21-2010, 01:12 PM

Your "stab it" power is down because it's only 600cfm.

cdowns · 04-21-2010, 01:19 PM

do you have a carb spacer like edelbrock recomends in the instruction booklet so that the fuel doesnt boil

CharlieBrown · 04-21-2010, 02:24 PM

Quote:

Originally Posted by cdowns

do you have a carb spacer like edelbrock recomends in the instruction booklet so that the fuel doesnt boil

Thats what I would guess

D-Rat · 04-21-2010, 02:33 PM

Choke is working fine.

There is no carb spacer. It's bolted directly to the manifold with just the gasket in between. That explanation makes sense.

What part are others running here? How thick? Anyone have one laying around they're not using?

mclairmo · 04-21-2010, 01:29 PM

Is the choke plate open when it is warm? If not, then the choke is not working and it needs to be fixed/replaced. When you pump the gas, you are actually opening the butteflies and allowing more air to enter, which is what the engine needs when warm. A warm engine should not need to be pumped to start up. However, when the engine is cold the choke plate needs to be closed, which explains why your cold starting is great. A closed choke plate will also kill your power. The cfm is fine for your engine and should not be a source of your "stab it" power issues.

Leviticus · 04-21-2010, 02:20 PM

Are you getting any hesitation on take off? And re-jetting an Edelbrock is quite simple, and can be done while it is on the engine although I doubt this is your starting problem. Edelbrock makes a nice jet kit for this. Also, like Cdowns said, a spacer is recommended.

What type of choke did you get, electric or manual?

even though your last carb worked well, its a good time to check you timing anyways. The PO of my truck had the timing way to advanced and it would be a bear to start in certain conditions.

Eddie H. · 04-21-2010, 03:46 PM

I had the same problem until I installed a 4 hole plastic spacer to insulate the carb from the manifold heat.

piecesparts · 04-21-2010, 03:50 PM

Definitely sounds like a "Heat Soak" issue. I would try the phenolic spacer to remove the heat from the bowls of the carb. I am running one on my stroker engine with the Edelbrock carb and intake.

D-Rat · 04-21-2010, 04:28 PM

Nabbed a 1/2" one off ebay new with gaskets and studs for $22.99 shipped. Will see how that works. Thanks guys.

AH619 · 04-22-2010, 05:31 PM

Most of the edelbrocks i have require about 1/4 throttle push with no pumping when warm. I have been told that all these drip a little fuel out the bottom? Sometimes i give mine 1 pump before i start it?

JCA1972 · 04-22-2010, 10:38 PM

Hey D-RAT I'm having the same problem with my 1406, I had a 1405 and it would start fine every time, the 1406 takes a while to start when hot, I have an edelbrock performer intake so it has the 4 holes. let me know if that spacer fixes the problem.

D-Rat · 04-23-2010, 01:46 PM

will do.

Shyguy · 04-23-2010, 01:54 PM

Don't me to hijack, but since you all are talking about Edelbrock carbs.

What would be the best one for my stock '73 454 with an manual transmission.

Thank you.

Danny

D-Rat · 04-23-2010, 04:06 PM

The 600CFM is marginal for my small block 400 but might work ok on a bigger motor with larger jets. A stock '73 454 is pretty low compression and probably doesn't have much in the way of high flow heads, so you might not get much benefit out of anything larger.

D-Rat · 04-25-2010, 11:30 AM

Spacer seems to have done the trick!

Crazy · 10-28-2014, 05:14 PM

Iv got the same problem, and my motor also diesels when ever i get to my destination and shut it down will the spacer fix this as well.

04-21-2010, 12:36 PM	#1
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	hard starting with new Edelbrock when warm The 1406 on my 400 makes cold starts a breeze...fires up on the first crank every time. The problem is when the truck is warm, it doesn't like to start and usually requires me to pump the gas pretty good while turning the starter. Eventually it catches. What do I need to adjust? The carb is brand new and unaltered. Let's assume timing is fine becuase this was not an issue with the previous carb, though it did have other issues. I'm also down on "stab it" power compared to the 730CFM Holley I took off. Ideas? I'm not crazy about rejetting, etc., as I've never torn one of these down, but if that's the only option, well... __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com Last edited by D-Rat; 04-21-2010 at 12:37 PM.

04-21-2010, 01:09 PM	#2
Tkmadone Registered User Join Date: Aug 2009 Location: Simi Valley, CA Posts: 193	Re: hard starting with new Edelbrock when warm Sounds too rich. Next hot start don't pump it, just hold the throttle half open and crank. If it starts right up then you are definitely too rich.

04-21-2010, 01:12 PM	#3
71tahoe Registered User Join Date: May 2006 Location: Jonesboro, AR Posts: 916	Re: hard starting with new Edelbrock when warm Your "stab it" power is down because it's only 600cfm.

04-21-2010, 01:19 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: hard starting with new Edelbrock when warm do you have a carb spacer like edelbrock recomends in the instruction booklet so that the fuel doesnt boil __________________ 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

04-21-2010, 02:33 PM	#6
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: hard starting with new Edelbrock when warm Choke is working fine. There is no carb spacer. It's bolted directly to the manifold with just the gasket in between. That explanation makes sense. What part are others running here? How thick? Anyone have one laying around they're not using? __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com Last edited by D-Rat; 04-21-2010 at 02:34 PM.

04-21-2010, 01:29 PM	#7
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: hard starting with new Edelbrock when warm Is the choke plate open when it is warm? If not, then the choke is not working and it needs to be fixed/replaced. When you pump the gas, you are actually opening the butteflies and allowing more air to enter, which is what the engine needs when warm. A warm engine should not need to be pumped to start up. However, when the engine is cold the choke plate needs to be closed, which explains why your cold starting is great. A closed choke plate will also kill your power. The cfm is fine for your engine and should not be a source of your "stab it" power issues. Last edited by mclairmo; 04-21-2010 at 01:32 PM.

04-21-2010, 02:20 PM	#8
Leviticus Shake and Bake! Join Date: Feb 2010 Location: Central Coast, CA Posts: 609	Re: hard starting with new Edelbrock when warm Are you getting any hesitation on take off? And re-jetting an Edelbrock is quite simple, and can be done while it is on the engine although I doubt this is your starting problem. Edelbrock makes a nice jet kit for this. Also, like Cdowns said, a spacer is recommended. What type of choke did you get, electric or manual? even though your last carb worked well, its a good time to check you timing anyways. The PO of my truck had the timing way to advanced and it would be a bear to start in certain conditions. __________________ "All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA"

04-21-2010, 03:46 PM	#9
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	Re: hard starting with new Edelbrock when warm I had the same problem until I installed a 4 hole plastic spacer to insulate the carb from the manifold heat. __________________ "Negative people always seem to have a problem for every solution"

04-21-2010, 03:50 PM	#10
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: hard starting with new Edelbrock when warm Definitely sounds like a "Heat Soak" issue. I would try the phenolic spacer to remove the heat from the bowls of the carb. I am running one on my stroker engine with the Edelbrock carb and intake. __________________ Frank Last edited by piecesparts; 04-21-2010 at 03:51 PM.

04-21-2010, 04:28 PM	#11
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: hard starting with new Edelbrock when warm Nabbed a 1/2" one off ebay new with gaskets and studs for $22.99 shipped. Will see how that works. Thanks guys. __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com

04-22-2010, 05:31 PM	#12
AH619 Registered User Join Date: Aug 2006 Location: HARRISON AR. Posts: 309	Re: hard starting with new Edelbrock when warm Most of the edelbrocks i have require about 1/4 throttle push with no pumping when warm. I have been told that all these drip a little fuel out the bottom? Sometimes i give mine 1 pump before i start it? __________________ 72 2wd lwb cheyenne super youngest son.green/white 72 2wd lwb cheyenne super oldest son.green/white 71 4wd 3/4 cheyenne super frame off manderin copper / white 4 inch lift. FINALLY DONE / SOLD 72 4WD SWB CHEYENNE BLUE/WHITE 388 AUTO REMEMBER THE COPS NEVER THINK ITS AS FUNNY AS YOU DO. NORWOOD SURVIVOR COPPERTONE BUILD THREAD/ http://www.67-72chevytrucks.com/vboa...d.php?t=259856

04-22-2010, 10:38 PM	#13
JCA1972 Registered User Join Date: Dec 2006 Location: Baytown, Texas Posts: 194	Re: hard starting with new Edelbrock when warm Hey D-RAT I'm having the same problem with my 1406, I had a 1405 and it would start fine every time, the 1406 takes a while to start when hot, I have an edelbrock performer intake so it has the 4 holes. let me know if that spacer fixes the problem. __________________ 1971 C-10 2004 Yukon: 1998 Honda Accord 2008 Honda Civic 2004 HD V-Rod http://67-72chevytrucks.com/vboard/s...d.php?t=226458

04-23-2010, 01:46 PM	#14
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: hard starting with new Edelbrock when warm will do. __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com

04-23-2010, 01:54 PM	#15
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: hard starting with new Edelbrock when warm Don't me to hijack, but since you all are talking about Edelbrock carbs. What would be the best one for my stock '73 454 with an manual transmission. Thank you. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

04-23-2010, 04:06 PM	#16
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: hard starting with new Edelbrock when warm The 600CFM is marginal for my small block 400 but might work ok on a bigger motor with larger jets. A stock '73 454 is pretty low compression and probably doesn't have much in the way of high flow heads, so you might not get much benefit out of anything larger. __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com



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04-25-2010, 11:30 AM	#17
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: hard starting with new Edelbrock when warm Spacer seems to have done the trick! __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com

10-28-2014, 05:14 PM	#18
Crazy Registered User Join Date: Oct 2014 Location: JBLM Posts: 20	Re: hard starting with new Edelbrock when warm Iv got the same problem, and my motor also diesels when ever i get to my destination and shut it down will the spacer fix this as well.

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