I drive a 59 ranchero. when ever I give it pedal it bogs. perfect idle. perfect starting. any thoughts.

 

Vacuum advance; or

Accelerator pump in the carb.

Check the small vacuum line between the carb/intake and the distributor for leaks.

Rebuild the carb.

 

Welcome to FTE

Bogging down, hesitating, stumbling from a dead stop or when accelerating at speed: Defective accelerator pump diaphram.

 

Hi thanks for your idea's. The carb was rebuilt by a well known carb shop. The car ran well for a few days and then developed this bogging problem. Is it likely that the accelerator pump or pump diaphram could go bad? Could it be a fuel pump.

 

If the carb has been rebuilt correctly, the accel pump should be OK. But, they could have installed a bad one, or installed it incorrectly.

Also, there is a little rod that connect the throttle crank to the accel pump. Did this fall off?

Fuel pump is possible but unlikely. Nothing special happens to the fuel pump when you floor the throttle. If the engine eventually "catches up" at higher revs after bogging down, the fuel pump/filter is probably OK.

Check the vacuum advance line. It might have come disconnected.

Also, there is a vacuum advance diaphragm on the distributor. This diaphragm could be bad.

 

New accelerator pump. The problem is: Age. How old was the new part when it was installed?

This part can lay on a shelf for years, before it finds its way into a carburetor.

Even in a box, humidty...ozone in the air causes it to harden up...the same effect one would expect after 40,000 miles.

 

Thanks guys I will try your ideas out this weekend. cheers,G