Starting Problem Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 Suburban · 07-11-2002, 09:47 AM

In the morning when I start the burb, I have been gettign what sounds like a backfire under the hood. After a few tries it will start and run fine. When the truck has been running during the day it never seems to be a problem when I start it. Only when it sits over night. Any ideas?

*Randy70C-10* · 07-11-2002, 09:51 AM

Sounds like the morning dew is getting under the distributor cap.

68 Suburban · 07-11-2002, 09:52 AM

Thanks for the input, but there is not much morning dew in Phoenix.

*Randy70C-10* · 07-11-2002, 12:00 PM

Hmmm, sand from the sand storm?

RodC · 07-11-2002, 12:34 PM

What kinda carb? Could it be leaking into manifold?

BTW, I looked long and hard for 67-68 burb trim at Carlisle, no luck. Talk about rare.

68 Suburban · 07-11-2002, 03:45 PM

RodC, thanks for looking. It is an edelbrock 1406 carb. Like I said, once it starts and runs, there are no problems for the whole day. It only seems to be when it sits over night and is started up for the first time.

BLACK AND BLUE 67-72 · 07-11-2002, 04:01 PM

Hey 68 Suburban, would you perchance have a heat insulator gasket under the 1406? If not then when you drive it for a while and then shut it off overnight the fuel in the carb could be percolating, in other words boiling which will make it very hard to start the next morning. That is what was happening with mine, I have a 1406 with a Performer RPM intake manifold and I had to buy the gasket for it, the Edelbrock part # is 9266 Divided heat insulator gasket. Maybe this will help!!

68 Suburban · 07-11-2002, 04:12 PM

BLACK AND BLUE 67-72, thanks for the idea. I don't have an insulator. I will have to check into it. Thanks

Longhorn Man · 07-11-2002, 04:51 PM

Black and blue, I am running that carb with no spacer at all, and I do suffer from the boiling gas, but only when I kill it hot and try to restart it shortly afterwards. first thing in the morning, I just have to crank it to fill it back up with fuel.
68, I am asuming you have checked all the silly stuff, idle speed, plugs, cap & rotor...
Have you looked at the timing or the advance unit? I have had that happen a time or two, but never on a regular basis.

BLACK AND BLUE 67-72 · 07-11-2002, 05:37 PM

Don't know Longhorn, but that is what mine did and now the next morning when I start it I pump the Pedal Two times and it fires off just like it was fuel injected!! Beats Me!!???

07-11-2002, 09:47 AM	#1
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	Starting Problem Question In the morning when I start the burb, I have been gettign what sounds like a backfire under the hood. After a few tries it will start and run fine. When the truck has been running during the day it never seems to be a problem when I start it. Only when it sits over night. Any ideas? __________________ Just sitting here contemplating contemplation.

07-11-2002, 09:52 AM	#3
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	Thanks for the input, but there is not much morning dew in Phoenix. __________________ Just sitting here contemplating contemplation.

07-11-2002, 12:34 PM	#5
RodC Registered User Join Date: Nov 2001 Location: Fairmont WV Posts: 304	What kinda carb? Could it be leaking into manifold? BTW, I looked long and hard for 67-68 burb trim at Carlisle, no luck. Talk about rare. __________________ Rod Childers '71 C10 Stepside

07-11-2002, 03:45 PM	#6
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	RodC, thanks for looking. It is an edelbrock 1406 carb. Like I said, once it starts and runs, there are no problems for the whole day. It only seems to be when it sits over night and is started up for the first time. __________________ Just sitting here contemplating contemplation.

07-11-2002, 04:01 PM	#7
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Hey 68 Suburban, would you perchance have a heat insulator gasket under the 1406? If not then when you drive it for a while and then shut it off overnight the fuel in the carb could be percolating, in other words boiling which will make it very hard to start the next morning. That is what was happening with mine, I have a 1406 with a Performer RPM intake manifold and I had to buy the gasket for it, the Edelbrock part # is 9266 Divided heat insulator gasket. Maybe this will help!! __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA Last edited by BLACK AND BLUE 67-72; 07-11-2002 at 04:08 PM.

07-11-2002, 09:51 AM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Sounds like the morning dew is getting under the distributor cap.

07-11-2002, 12:00 PM	#4
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Hmmm, sand from the sand storm?

07-11-2002, 04:12 PM	#8
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	BLACK AND BLUE 67-72, thanks for the idea. I don't have an insulator. I will have to check into it. Thanks __________________ Just sitting here contemplating contemplation.

07-11-2002, 04:51 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Black and blue, I am running that carb with no spacer at all, and I do suffer from the boiling gas, but only when I kill it hot and try to restart it shortly afterwards. first thing in the morning, I just have to crank it to fill it back up with fuel. 68, I am asuming you have checked all the silly stuff, idle speed, plugs, cap & rotor... Have you looked at the timing or the advance unit? I have had that happen a time or two, but never on a regular basis.

07-11-2002, 05:37 PM	#10
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Don't know Longhorn, but that is what mine did and now the next morning when I start it I pump the Pedal Two times and it fires off just like it was fuel injected!! Beats Me!!??? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

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