Engine Hesitates and Dies - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sblackmon · 09-01-2013, 03:16 PM

Bought a 68 C10 LWB with a 396. It ran a little rough when I got it and tried to tune the carb (old q-jet) and found that it had a large vacuum leak. The truck did run and drive ok though. I replaced the q-jet with a 1406 Edlebrock and got it tuned in good. Now when I drive it hesitates and dies when I accelerate. It does better if I punch the gas. When it is parked it idles great and I can hit the gas then (in park) and no problem. Any ideas?

SCHRUMGMC · 09-01-2013, 05:23 PM

When I press my Pedal mine dies as well

sblackmon · 09-01-2013, 05:59 PM

More info. When I adjusted the idle mixture I got the vacuum gauge to change (rpm change) when I went lean, but never got a change when I went rich. Gauge showed good vacuum all the way out. It also has an electric fuel pump. I is reading about 7 psi. Edlebrock states no more than 6. Not sure if that would cause the hesitation and death.

SCHRUMGMC · 09-01-2013, 06:03 PM

How much does one of them Electric Fuel pumps run ?

FLDBRED · 09-01-2013, 06:59 PM

How long has the gas been in the truck?

sblackmon · 09-01-2013, 07:19 PM

Not sure the cost of the pump. It was on the truck when I bought it. The gas is fresh. I actually ran it out of gas a few weeks ago while I was working on it. So I know the stuff in it now is good.

PanelDeland · 09-01-2013, 08:22 PM

Does it have the points style distributor?
Does the vacuum advance work?
Have you checked the fuel filter?
How old are the plug/coil wires?
There are a lot of things that can cause the issue you relate.Give us a few more details and maybe we can better guide you.

SCHRUMGMC · 09-01-2013, 08:44 PM

Question does a 1971 gmc have points and if so were would they be located ?

STOCKISH · 09-01-2013, 09:50 PM

Quote:

Originally Posted by SCHRUMGMC

Question does a 1971 gmc have points and if so were would they be located ?

It sure does buddy, the points are under the distributor cap. The cap is what the spark plug wires plug into behind the air cleaner.

SCHRUMGMC · 09-01-2013, 10:08 PM

Thanks man, that could be a reason it isn't starting up correctly...Hmmm

sblackmon · 09-03-2013, 09:15 AM

It is a point style distributor and the vacuum advance works. The plugs and coil are fairly new. I have not changed either of the fuel filters.

09-01-2013, 03:16 PM	#1
sblackmon Registered User Join Date: Aug 2013 Location: Brownsboro, TX Posts: 7	Engine Hesitates and Dies Bought a 68 C10 LWB with a 396. It ran a little rough when I got it and tried to tune the carb (old q-jet) and found that it had a large vacuum leak. The truck did run and drive ok though. I replaced the q-jet with a 1406 Edlebrock and got it tuned in good. Now when I drive it hesitates and dies when I accelerate. It does better if I punch the gas. When it is parked it idles great and I can hit the gas then (in park) and no problem. Any ideas?

09-01-2013, 05:23 PM	#2
SCHRUMGMC Registered User Join Date: Dec 2012 Location: North Carolina Posts: 4,989	Re: Engine Hesitates and Dies When I press my Pedal mine dies as well __________________ 1971 GMC Sierra 1959 GMC 100

09-01-2013, 05:59 PM	#3
sblackmon Registered User Join Date: Aug 2013 Location: Brownsboro, TX Posts: 7	Re: Engine Hesitates and Dies More info. When I adjusted the idle mixture I got the vacuum gauge to change (rpm change) when I went lean, but never got a change when I went rich. Gauge showed good vacuum all the way out. It also has an electric fuel pump. I is reading about 7 psi. Edlebrock states no more than 6. Not sure if that would cause the hesitation and death.

09-01-2013, 06:03 PM	#4
SCHRUMGMC Registered User Join Date: Dec 2012 Location: North Carolina Posts: 4,989	Re: Engine Hesitates and Dies How much does one of them Electric Fuel pumps run ? __________________ 1971 GMC Sierra 1959 GMC 100

09-01-2013, 06:59 PM	#5
FLDBRED Registered User Join Date: Jun 2009 Location: CENTRAL,NJ Posts: 586	Re: Engine Hesitates and Dies How long has the gas been in the truck?

09-01-2013, 07:19 PM	#6
sblackmon Registered User Join Date: Aug 2013 Location: Brownsboro, TX Posts: 7	Re: Engine Hesitates and Dies Not sure the cost of the pump. It was on the truck when I bought it. The gas is fresh. I actually ran it out of gas a few weeks ago while I was working on it. So I know the stuff in it now is good.

09-01-2013, 08:22 PM	#7
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Engine Hesitates and Dies Does it have the points style distributor? Does the vacuum advance work? Have you checked the fuel filter? How old are the plug/coil wires? There are a lot of things that can cause the issue you relate.Give us a few more details and maybe we can better guide you. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

09-01-2013, 08:44 PM	#8
SCHRUMGMC Registered User Join Date: Dec 2012 Location: North Carolina Posts: 4,989	Re: Engine Hesitates and Dies Question does a 1971 gmc have points and if so were would they be located ? __________________ 1971 GMC Sierra 1959 GMC 100

09-01-2013, 10:08 PM	#10
SCHRUMGMC Registered User Join Date: Dec 2012 Location: North Carolina Posts: 4,989	Re: Engine Hesitates and Dies Thanks man, that could be a reason it isn't starting up correctly...Hmmm __________________ 1971 GMC Sierra 1959 GMC 100

09-03-2013, 09:15 AM	#11
sblackmon Registered User Join Date: Aug 2013 Location: Brownsboro, TX Posts: 7	Re: Engine Hesitates and Dies It is a point style distributor and the vacuum advance works. The plugs and coil are fairly new. I have not changed either of the fuel filters.

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