hello, i had several months ago been trying to fix my 85 /6 truck, just decided to not repair, so purchased another '85 this time a 150 4x4 auto, 318 V8, engine problems are this, constant dieing out, no power, stumbling, rough idle & miss, another problem is this a previous owner had converted the ignition system to a vacuum advance dizzy, ballast resistor & ecu, so that leaves out the leanburn problme, i changed the fuel filter, it seemed to help a bit but not anymore, when accelerating from 25-35 mph or so, it goes to stumble & die if not let off of quickly, it kinda like the choke is not working but i check & it is, also @ around 65-85 it does the same as previously mentioned. well, thanks for any help w/ this.

85slant6
jude fontenot
Mamou, Louisiana, USA

 

I had the same poblems with my 81 van w/318, 2 bbl. This engine has a Holley, 2-bbl. All the problems very similiar to yours; stumbling and acting like the engine needed more choke (no adj on this.) The solution to this problem was to disassemble the Holley, and remove the jets and drill them out slightly. It tried this several times, until I felt things were right, I had to remove the cover over a dozen times. I think the hole size on the jets ended up about .055 in dia. I was told that Chrysler tried to get their vehicles to pass the emissions at this time and any carbon or time & wear caused a lean effect. This will help, if the carb has jets, like the Holley does.

 

81vanman, thanks, how hard is it to disassemble carb to get to jets, & time, how long does it take on average for a first timer.

thanks

85slant6
jude fontenot

 

85slant6-If you don't have some experience with disassembling carburetors with respect to installing repair kits, I wouldn't try this without experienced help. First time carb tear down & reassemble can become a nightmare and can result in a junked carb or one that needs costly repair. If you get this help, I would suggest buying a kit (I'm assuming you have a Holley 2-bbl, which should have removeable jets) because a kit will have the needed new gaskets that are needed. You will need a bucket of carb cleaner (potent stuff). A successful tear-down involves installation of new kit & cleaning of carburetor componets, and not the least, removing the jets & carefully drilling them out (requires a numbered drill w/patience and luck) This is a precision operation all the way through.