hesittates on take off

I have a 69 ford truck with a 1974 302 w off a maverick . every time i go to take off it feels like the engine is go to shut off . i just replaced the carb , the battery and the voltage reg. i set the timing to 12 deg btc.the ponits are set at 17mm .what eles can be wrong with the engine? i need help pls!!!




thnxs

 

i recently dealt with a throttle hesitation on one of my past 302s check if your vacum advance is good then check throttle linkages(my 302 hesitated because both these things)

 

how do i know if the throttle linkages are set right?????

 

no i explained wrong i guess, on my truck (it was a 69 f100) we were searching on the carb we noticed a clip was missing that pulled on the throttle so it had a hard time trying to open up so just search for something as simple as pieces dissconnected

 

is it better to put a electric ingntion?

 

not sure about the electronic ignition but test that vacum advance it can make a big difference as to the truck responding to you stepping on the gas.

 

Points at 17 Millimeters? There's your problem. Point gap starts at .017 THOUSANDTHS of an inch. Then adjusted til the dwell angle is at 26* to 31*. Better yet is to replace the points and condenser with an electronic module.

 

You might want to adjust the accelerator pump on that new carb if you havent yet.That will cause hesitation as well.

 

my 250 i6 is doing the same thing his engine is doing

 

The problem with "take-off hesitation" is usually one or more of three things:
1. The throttle is too far open so the fuel transfer slot is already going lean.
2. the accelerator pump is not adjusted with "zero" clearance at idle.
3. incorrect choke adjustment - if it acts up when cold more than other times.

With a 1969 truck you should get pretty good service if the carb is the right one for your truck. If it is off a later truck or car then it will have a real problem. The later carbs have a "by-pass" hole in the accelerator pump that puts fuel back into the bowl instead of into the engine. The earlier carbs didn't have it. You should be able to plug it either by soldering the hole in the brass cup or by putting a lead rivet in the hole.
Adjust your accelerator pump linkage so that when the throttle is completely depressed and the accelerator pump link is pressed there is a .020" to .060" gap between the adjusting screw and the lever. Make sure there is no gap with the throttle closed. If that adjustment is made and you still have a problem then be sure that your choke is properly set. If the problem persists then you can drill the nozzles one number drill size larger at a time until the problem goes away.
The easiest fix is to get a Holley replacement carb - they come from the factory without the problems you get with a rebuilt factory carb.

 

Hesitation can also be retarded timing and points adjustment as well.

 

timing

what is the timing supposed t 12 btc?

 

12* BTDC is a good starting point. Probably ideal.

 

I am having the same exact problem with my car, and along with it the lights will flicker on and off. Sometimes staying off for a little while. Other times I can mess with the high beam switch on the floor and it will work sometimes with the brights and others with low beams?? Can these problems be related???

 

Sounds like bad ground wires or ground connections