Q: WHEN I ACCELERTE FROM A STOP ITS FINE IT LEAVES BUT ONCE IM GOING 45 MPH IT BOGGS DOWN AND WONT ACCELARATE

asked by on

I have an old classic pick up 1952 International. L110. It has a 350 Pontiac engine 4.9 with a carter 4bbl carb. I drive only for local cruises. I can accelerate fine but once I have going approx 45-50 mPH I try to step on gas to keep momentum and engine boggs down. I can then also slam on gas to open all 4bbl and same thing. only RPM sound higher but the vehicle wont move. I have tried moving the fuel mixture screws and it helps a little but I still dont get all the HP that the engine can do. any ideas?
My car has an automatic transmission.

Hi there. What you are describing is very common with either a vacuum leak, or an issue with the jetting in the carburetor. Most of the time, a bogging issue is caused by too much fuel (or a rich situation). This is typically controlled by the main jets in the carburetor. It is also possible that you have a dirty fuel filter or a fuel pump that is not working as well as it should be. Check these components to see if it clears up. If not, you might want to have a performance shop or professional mobile mechanic come to your location to try and diagnose and resolve this problem.

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. WHEN I ACCELERTE FROM A STOP ITS FINE IT LEAVES BUT ONCE IM GOING 45 MPH IT BOGGS DOWN AND WONT ACCELARATE

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: Transmission actualization (updated)

Hello - If i understand you correctly, you are asking where the 5 solenoids (you refer to them as "actualizations") for this transmission (4T60E) are located. These solenoids are mounted to the transmissions valve body, which is located inside an...

Q: Car shuts off as soon as the starter stops

Hello there, thanks for writing in about your 1997 Chevrolet El Camino. Although you already replaced your ignition switch, many different faults can cause a no start condition. Some of the more likely faults would include a fuel pump, battery,...

Q: Car wont go over 55 n over heated n spilled back into reserve jug n out radiator cap

Overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, a clogged radiator or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.