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Dr. Hamman
Dr. Hamman, Technician
Category: Classic Car
Satisfied Customers: 2436
Experience:  I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
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Car keeps turning off when I let off the gas. Need help

Customer Question

Car keeps turning off when I let off the gas. Need help
Submitted: 9 months ago.
Category: Classic Car
Expert:  K. Wiggins replied 9 months ago.

Hello does it do this when braking, or only if letting off?

Customer: replied 9 months ago.
Only when letting off gas pedal
Expert:  K. Wiggins replied 9 months ago.

Thanks, ***** ***** running the original quadrajet carb? IF so is it the one with electronics?

Customer: replied 9 months ago.
it is original carb and it has an electronic choke
Expert:  david craig replied 9 months ago.

Hi Im David, is this a project car? has it been sitting a while?

Customer: replied 9 months ago.
it has been sitting for a while and I try to start it every so often. Wasn't an issue before till recently
Expert:  david craig replied 9 months ago.

where has it been sitting? outside? barn?shed?

Customer: replied 9 months ago.
It's been inside the garage
Expert:  david craig replied 9 months ago.

check out the wiring for the electronic choke, make sure no critter decided to munch on it.

Expert:  david craig replied 9 months ago.

any luck?

Customer: replied 9 months ago.
Still at work
Expert:  david craig replied 9 months ago.

ok. sorry

Expert:  david craig replied 9 months ago.

checking in to see how its going

Expert:  david craig replied 9 months ago.

do you still need assistance?

Customer: replied 9 months ago.
I haven't had a chance to check I have to go to a family member's garage where I park the car to check I've been working 16 hours a day is so hopefully soon
Expert:  david craig replied 9 months ago.

ok

Customer: replied 9 months ago.
I belive it's an mechanical choke... not Electric cuz no wires
Expert:  david craig replied 9 months ago.

ok. hang on a few

Expert:  david craig replied 9 months ago.

thats electronic..... are there not a terminal on the side to plug a wire onto it?

Customer: replied 9 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 9 months ago.
I see no wires or thermal anything
Customer: replied 9 months ago.
Customer: replied 9 months ago.
Other view
Expert:  david craig replied 9 months ago.

thats an electronic adjustment. thats weird. do you know the part number of the carb?

Customer: replied 9 months ago.
What is this called? Hose was not attached and I attached it and it stays on now
Customer: replied 9 months ago.
Choke adjustment
Expert:  david craig replied 9 months ago.

its the vacuum advance for the timing. very very important

Customer: replied 9 months ago.
Where does that hose go?
Expert:  david craig replied 9 months ago.

i see thatsa choke adjustment but that type of adjustment is notrmally only installed on a carb with electronic choke

Expert:  david craig replied 9 months ago.

the vacuum advance goes from the advance to the carb. theres a fitting it plugs onto.

Expert:  david craig replied 9 months ago.

There’s been a lot of debate whether or not the vacuum canister should be plugged into a ported or direct vacuum source. Internet forums are rife with opinions on both sides of the argument. However, there is a right and wrong way. And it’s not an opinion; it’s just a fact.

Plugging your vacuum advance into a direct source will allow it to engage at idle, which is good for a number of reasons. Much like cruise conditions, engines run leaner at idle than they do under load. Again, this means the mixture burns slower and needs an earlier spark to optimize the burn. Ensuring that the mixture has a complete burn before leaving through the exhaust port also helps the engine to run cooler at idle. All carbureted cars were set up with direct vacuum to the distributor before more stringent emissions requirements reared their heads.

Customer: replied 9 months ago.
What would you consider a direct source... to the carb or manifold?
Expert:  david craig replied 9 months ago.

i would go to the carb....

Customer: replied 9 months ago.
Do you have a vacuumed hose diagram?
Expert:  david craig replied 9 months ago.

here

Expert:  david craig replied 9 months ago.
Customer: replied 9 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Provide Diagrams, Manuals, or Instructions. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  david craig replied 9 months ago.

what else do you do you need?

Customer: replied 9 months ago.
Fixed all hoses but it still shuts down, what eles can I look at.?
Expert:  david craig replied 9 months ago.

pull the carb off and check the condition of the gasket

Customer: replied 9 months ago.
Did that and the gasket it good and new
Expert:  david craig replied 9 months ago.

adjusting the air and fuel mixture screws may help

Expert:  david craig replied 9 months ago.

any luck

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