Q: Car will stall out at random while driving?

asked by on

I have a carbureted car with a 229 engine, 2 barrel, with one of the first CCC on it. Recently the car has started stalling out while driving it. It will run good at an idle, but will sometimes stall out at acceleration, or while just cruising down the road. The carb has been cleaned before and the vehicle just recently had a tune up (plugs/wires/distributor cap/fuel lines/etc). This is a very recent problem and seemed to happen after hitting a particularly bad bump in the road.

My car has 96000 miles.
My car has an automatic transmission.

Hey there. While it has been some time since I worked on one of these early CCC vehicles, the first place I would look is the carburetor itself.

If the vehicle idles fine but stalls or hesitates when hitting the gas pedal, the accelerator pump inside the carburetor may be faulty. When you hit the gas pedal, the engine needs an immediate increase in fuel. The accelerator pump provides that. It is a rubber diaphragm that with age, can harden and/or crack, which reduces it’s ability to respond to that immediate fuel requirement. Have a certified technician inspect the vehicle for a failed accelerator pump as it is the most likely cause.

One other possibility is the ignition control module, located in the distributor. Typically when they fail, they simply fail, providing no spark and the vehicle will not start. However, within the module are different circuits. One for cranking and one for running. An intermittent fault in the "running" circuit can cause a momentary loss of spark, particularly on heavy demand such as accelerating as the increased demand for power requires the module to alter ignition timing. While the module is a possible cause, in all likelihood, replacing the accelerator pump and/or rebuilding or replacing the entire carburetor with a rebuilt one will probably solve your issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car will stall out at random while driving?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gas pedal hard to apply, can't go past 55 mph

Hello. It sounds like the transmission isn’t shifting gears properly. A problem with the first, second, and/or third gear can cause difficulty with acceleration. Another possibility is that the catalytic converters are clogged causing poor acceleration. When this happens it...

Q: Gas in manifold, 1977 Chevy Nova

Hey there, thanks for writing in about your 1977 Chevy Nova 250. If you are flooding the engine from a carburetor problem, then you most likely have a needle and seat or float not adjusted properly. You should have the...

Q: driveshaft has dents -vibrates above 50 mph

Try searching inventory at www.car-part.com which will also give you the interchange info you have requested. You will probably find a used driveshaft via that website and there is no reason it can't be shipped via UPS to your locale....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...