carb problems?

-

newguy

Well-Known Member
Joined
Sep 25, 2004
Messages
115
Reaction score
7
Location
Brooklyn Park, MN
The car has had a problem hesitating and stalling if you do not keep the pedal in the same position when she is not completely warmed up.

Now after sitting for about seven months, we took her out on the hiway and she did okay until I got on the off ramp. She stalled on me, and then would start up fine, until I put it in drive, it would not die, just idle rough. Then I push the gas and she would die right away.

She did that four about five minutes, and then all of a sudden she was driving fine. After that I did not go above 45mph and she was fine again.

Am I right in assuming the carb needs a rebuild?

thanks for any advice you can give to get this car back to running smooth.
 
sounds like it just needs a good cleaning. fuel gummed up in some of the passages.
 
Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download. Tune-up parts and technique suggestions are here.
 
Yes, a good cleaning, and a new accelerator pump will come with the rebuild kit. Should only have an inline filter up at the carb, unless something has been added. When you take off the filter, keep it horizontal and dump the gas in it into a clean can or cup. If it is clean, ok, but look for bits of rust or gunk, that might indicate junk is floating around in the gas tank; look for same in float bowl. If suspicious, have a helper turn the starter while you hold a clean can under the gas line and run a quart or so into it. If it isn't clean and spotless, you may want to drop the tank and check it out. But my bet is that carb kit and new accel pump will do it. Had one of those 74s myself, best MoPar I ever owned, all considered. Wish I had it back...
 
Yes, a good cleaning, and a new accelerator pump will come with the rebuild kit. Should only have an inline filter up at the carb, unless something has been added. When you take off the filter, keep it horizontal and dump the gas in it into a clean can or cup. If it is clean, ok, but look for bits of rust or gunk, that might indicate junk is floating around in the gas tank; look for same in float bowl. If suspicious, have a helper turn the starter while you hold a clean can under the gas line and run a quart or so into it. If it isn't clean and spotless, you may want to drop the tank and check it out. But my bet is that carb kit and new accel pump will do it. Had one of those 74s myself, best MoPar I ever owned, all considered. Wish I had it back...

Wife loves the 74, so much so we just signed a deal at a body shop to get it in some new paint. Now we need a new vinyl top and find a place to buy the white bumble bee stripe. :D

Thank you all, when we get it back from the body shop, I will pull the carb and start the work, and check the line/filter for any obstructions :)
 
Hi NewGuy, the links slantsixdan provided are invaluable, I rebuilt my 1920 the past weekend using only the .pdf file, lots of pictures taken for reference, and a half dozen baggies to keep myself organized. Stripped it, cleaned it, assembled It, a shot of ether and good to go... but I'd clean It first to save some time :-D
 
make sure you give the throttle lever a good wiggle and check for any play in the shaft bores before dropping a dime on a rebuild kit.
 
I do not know how much smog control crap is on the '74 /6, but I know the newer ones (80's) had all sorts of **** all over them. One line was connected to the charcoal canister, and when the filter inside the canister would begin to fall apart, the carburetor would suck bits of it in. This caused ALL SORTS of driveability problems which were really hard to chase down; they would appear, disappear and re-appear, seemingly at random intervals.
Often the carb would need a rebuild and a pro-fuel or similar type fuel filter would have to be installed in the emissions line to capture any wayward particulate matter intent on corrupting the carb.
 
make sure you give the throttle lever a good wiggle and check for any play in the shaft bores before dropping a dime on a rebuild kit.


I totally agree. A competent machine shop should be able to install some brass bushings if the holes for the throttle shaft are out-of-round or otherwise worn. I've had this done on quite a few carburetors over the years.
 
The stalling out whenever you move the throttle position sounds like an accelerator pump. If the engine doesnt get that extra fuel at low revs when the throttle opens, it leans out and stalls, at high speeds momentum helps it along until the jets catch up to the new mixture. Still, check some of the easier quick fixes mentioned here first, either way, if the carb is old and hasnt been cleaned out in a while, couldnt hurt to crack it open take a look and do some cleaning while you're in there.
 
-
Back
Top