Bad Hesitation

[pb24]

I have a 68 charger with a 383 the engine is stock as far as i know. It has a four BBL Carter Carb. on it. The problem is that when you step on the gas pedal form a dead stop the car just dies, if I let up on the pedal it will catch again. If you are going any speed and step on the pedal it runes fine. In the summer time when it's hot outside and the car is running a little hotter I can barely take off from a light without the car dieing.

[tecmopar]

Well just for starters check the accel. pump on the carb. If its an original it probably needs to be freshened up a bit, good luck.

[resq302]

I was having the same problem with my car recently only that it would back fire once through the carb and then take off.  I am finding that the carb goes too lean when you go from idle to wide open throttle.  I have increased the jet sizes in the primary jets and am getting a bigger squirter for the accelerator pump.  Hopefully that should do the trick.

[pb24]

I bought a rebuild carb. about two years ago. How much of the carb. do i have to take apart to change the main jets?

[pb24]

Can anybody tell me how to change the primary jets

[myk]

Before you tear into the 'carb, has the car always behaved like this, or did this problem just happen recently?  If it just happened recently, you'd be looking into tune up and maintenance issues instead.  I'd definitely look into that accelerator pump for starters.  This problem could also be ignition related, too.

Because you asked, changing jets on that carter means unhooking all of the linkages, lines, etc. then taking off the top half of the body.  You gain access to the jets and will need a flat-head screwdriver to remove them.  Now, I'm assuming that's right because my Edelbrock is based on carters and I think it's the same. 

Before you got that route, try the tuning issues, like a fuel filter, ignition pieces, etc.  Someone else chime in here...

[pb24]

When I bought the car about 2 years ago the carb it came with was no good. So the carb thats on it now is the only carb that I've ever work with. the car has always had a problem that when you nail it from a dead stop it falls flat. the is much worse when it's hot outside, just taking off from a light is a little tricky I'm still running points and their new with the correct dwell. It had a bad back firing Thur the carb when i got the car so I just advanced the timing until it the backing firing stooped I'm running about 12-15 degrees advance. when your driving down the road the car runs fine and if your going any speed and give it some gas it responses fine Thanks everybody for your input I just want to get it right before summer.

[myk]

Well, if the car responds well once it's running then I'd say the jetting is fine.  I'd still look into that accelerator pump and check for damage or something.  On Holley's you can change the accelerator pump size if you want more squirt.  On Carter based 'carbs like ours I think we're stuck with the one size.  You can adjust the stroke on the pump so it squirts more or less during the transition from idle to part throttle but that's it. 

Freaking Carters...

[pb24]

What exactly I,m i looking for in the acceleator pump? How do you adjust the stroke on the pump?

[aifilaw]

there's a "cam" that actuates the pump. Easily adjustable and changeable on a Holley... God knows on that thing.

[myk]

What exactly I,m i looking for in the acceleator pump? How do you adjust the stroke on the pump?

Easy enough.  It should be on the left side of the 'carb.  Obviously pull off your air cleaner.  Check out the manual for an Edelbrock 'carb, specifically page 21, part #20, and try to find that on your 'carb.  Then, check on page 8 on how and where to move the pump link.  Better yet, just read the manual from cover to cover because it has plenty of information involving theoretical operation of a 'carb, tuning, metering ,etc.   Now, I'm "guessing" your 'carb is set up like the Edelbrock because their 'carbs are Carter based:

http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf