Help Needed (1 Viewer)

[77landsitter]

I am currently stumped with my cruiser at the moment. Its a 77 with a 2f I swapped in from my other 78 which is getting a 350. It runs strong with the choke on but as soon as the choke is disengaged it stalls out. The carb is an aisan which I just had rebuilt by a local reputable rebuilder. If any one has any suggestions or is around the Easton area and could stop by and take a look I'd appreciate it and have plenty of beer in the fridge.

Thanks.
Dan

 

[76FJ40]

Is the idle circuit solenoid wire connected?

 

[Stumpalama]

Too lean a mixture at idle? if you keep the revs above 1000 rpm and push in the choke does it still run? After you check the idle solenoid, try this. If you can run it around 1000rmp (technically no longer idling) then look to the idle curcuit and next, vaccuum leaks, a can of starter fluid around the base of the carb then the intake around the head.

 

[caz]

The person who rebuilt the carb may have reversed the jets. I did this when I rebuilt mine. The symptoms were the same.

Check that idle mixture screw is backed out to the initial setting (for my '74 it is 2 turns from closed)

Get a vacuum gage and see what kind of vacuum you are pulling. Not enough fuel is either a problem with fuel supply (blockage) in the carb, or a vacuum leak is causing low vacuum at the carb - keeping the engine from sucking enough fuel.

Has the truck been running good previously, or are you just getting it running? Mine acted up last week - it would not idle. I did the "Oklahoma rebuild". Remove air cleaner - with engine running, put hand over carb to kill engine - this will create a high vacuum in the carb and could suck out any small blockages.

 

[77landsitter]

Guys,

Thanks for all of the suggestions but unfortunatelly have already checked these things. The idle solenoid itself is working. Could you please go a little further in depth about the idle circuit? It will run with the choke off if kept above approximately 1000s rpms. As far as vaccuum leaks go i have a very slight intake leak. So slight that if i spray 2+2 over the intake its about a 100 rpm increase. The engine ran strong when pulled from the doner truck. Is there anyway to determine if the jets are reversed with out dismantling the carb?

Thanks again,
Dan

 

[Stumpalama]

Over 900rpm is no longer idling... meaning the fuel supply is from more than just the idle curcuit. How is your timing? what is your vacuum reading? there is a good link in the tech section about tuning your engine using a vacuum gauge.
Have you tried richening the mixture? loosen the idle mixture screw four to six turns... (over rich) does it idle (650-800 rpm) then? Try this in concert with turning the idle speed screw in until your at about 800 rpm.
do that and post up
we'll work from there.

 

[caz]

Now that I think about it, my switched jet problem is not gonna be your problem. Mine would not run at ALL without the choke on. Idle has nothing to do with the jets does it?