Skip the auto shop - Our mechanics make house calls

Q: Hesitation on acceleration - 1980 Chevrolet C10 Suburban

asked by on

Hello I have an issue with my suburban , it have been working perfectly since forever and I perform the usual mantainance I used for traveling once or two ce per month and sometimes in the city to transport big equipment (I'm a musician ). But last week I experienced a hesitation on acceleration when I press the gas pedal , the carb it's a quad , starts quickly and works perfect at low speeds when once I go to the highway and press the pedal down (opening the first to barrels to full) it feels the lack of power and If I opened the 4 barrels accelerates just good as usual . So the problem it's when I opened the first two barrels wide open . I checked the vacuum lines , no further problems with them I replaced them new , also cables , fuel lines , fuel filter , air filter , spark plugs , etc . The problem it could be the acceleration pump on the carb?.

Thanks !!!.

My car has 99999 miles.
My car has an automatic transmission.

Hi there. From the description you have provided, your vehicle’s hesitation could be, the carburetor’s accelerator pump not working. An easy way to identify whether the accelerator pump is working or not. Remove the air cleaner housing, engine off, open choke butterfly. Looking inside at the primary venturi(s), there are two small nozzles above them, that deliver fuel when the accelerator plunger is pushed.

Moving the throttle plate will depress the plunger and you should see fuel squirt from the nozzles. No fuel from the nozzles, would indicate the carburetor should be overhauled.

Unfortunately, now days hard to find someone to rebuild a carburetor. I recommend having your vehicle’s hesitation symptoms be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: My car wants to kind of like jerk going up hills & taking off

This jerking can be coming from a couple of things. A low transmission fluid level from a leak can cause jerking as the fluid pressure inside the assembly cannot remain stable. The transmission fluid can come into contact with the...

Q: Gas tank access door not opening

A visual inspection of the problem will help us determine the cause of your issue. You likely have a damaged cable which runs to the door, or even perhaps a broken piece of plastic in the system. A qualified technician,...

Q: Truck won't start, just brought a new battery last week and had the alternator checked and it was good...won't start

You should first try to put the shifter in neutral to see if it cranks over? If not then test to see if the starter is getting a start signal from the ignition switch? If it is then replace the...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.