68 Dart 318 2bbl stumbles

Reply Subscribe

Thread Tools

Search this Thread

01-17-2009 | 12:51 PM

DartConvertible

Guest

Posts: n/a

68 Dart 318 2bbl stumbles

I just had the stock carb rebuilt and re installed on my Dart, and after coasting or decending a hill, when I step on the gas, I get bit of a stumble before the car goes. It's pretty subtle when the the car is warmed up, more noticeable when the car is cold. Any thoughts as to what this might be would be a great help. It's a 318 with the 2bbl, CA car and Torqueflite.

Thanks

Peter

Reply Like

01-17-2009 | 02:43 PM

66sportfury

Guest

Posts: n/a

could be a few things like timing, the vacumm advance not working properly, the choke not set right. just to name a couple.

Reply Like

01-17-2009 | 04:42 PM

78D200

Admin

Joined: Apr 2008

Posts: 8,173

Likes: 200

From: Goffstown, NH

the fuel/air misture or idle could be off too. I'd double check your timing, look for any and all vacuum leaks and adjust the gule/air mixture.

Did you do anything else to the powertrain beside having the carb rebuilt?

Reply Like

01-17-2009 | 06:50 PM

Polaradude

Mopar Lover

Joined: Dec 2008

Posts: 2,509

Likes: 0

From: East Coast Canada

I agree with 78d200 and 66, the only other thing not mentioned is fuel filter but it sounds more like what the boys said above.

Reply Like

01-18-2009 | 06:05 AM

Crazy4Carz.Com

Mopar Lover

Joined: Apr 2008

Posts: 1,074

Likes: 1

There is an adjustment on your accelerator pump. This is the part on the carb that squirts the gas in when you press on the pedal. The fuel is sucked from the bowls through the carb venturis with the air that is going through the carb. when you press on the gas initially the air gets in but there is a delay in sucking up enough fuel. this creates a temporary lean situation. The accelerator pump squirts a little fuel into the carb on acceleration the compensate for this. My guess is the accelerator pump is not re-installed correctly (if it was not doing this before) or is out of adjustment.

Reply Like

01-20-2009 | 12:20 PM

DartConvertible

Guest

Posts: n/a

Thanks, I'll start with the easy stuff, the vacuum leaks. I does pump out a lot of black smoke once it starts, then as the choke turns off it stops. I've learned not to floor the pedal to set the choke, but was manually tripping the choke butterfly and now can hear it trip when I tap the pedal. I wondered about the jets, if they had been changed or something. The fuel filter is new and totally clear. Otherwise, it runs like a top. If Chrysler still made something like this....

Reply Like