1978 FJ40 2F Idles ok, stalls when trying to accelerate unless high revs

[cmcmill01]

Set the points to make certain they're not frozen. Confirm you're hooked up to cylinder No. 1 with the timing light. Lightly loosen the distributor clamp so that you can just barely turn it by hand. Start the vehicle and, with the timing light aimed at the bellhousing window, slightly rotate the distributor CW and CCW until you spot the ball. Be very careful to avoid any moving engine parts like the fan blade, pulleys, or fan belt. Keep your body, hands, and any loose clothing well around to the passenger side of the engine. Put something non-conductive over the battery like cardboard, etc. You've got to be somewhat close with the timing to get it to run well at all. Don't worry about the vacuum advance issue yet.

Can you do this with the choke pulled slightly as she doesn’t run without it??
Thanks

 

[cmcmill01]

Did a compression test:
Cyl 1 : 137
Cyl 2: 125
Cyl 3: 130
Cyl 4: 130
Cyl 5: 125
Cyl 6: 135

Which I think is good news. I also messed about with the lean mixture to set correctly, but I think I have mucked that out as she is definitely overfuelling now!!

 

[cmcmill01]

So took the air filter off and had a good look at the carburettor nozzles, and only one is squirting liquid when the accelerator is opened up.
What is the best and easiest way to clean this jet?

 

[charliemeyer007]

The correct answer is to re-build the carb. Take it apart and clean it. I bought a heated electronic sonic cleaner and a gallon of carb juice designed to use in it - haven't done it yet so can't say how good it is. The chem dip stuff works - I used that stuff like 40 years ago with good results. Having the correct kit is very helpful - as things like gaskets can tear when you take it apart.

You could try carb spray with a pee tube poked right into the jet to try and flush it. Perhaps poking a thin wire into the jet using a hemostat to help you reach it.

Carb work isn't for every one. There are people here that do that job. Someone here did some very good vids on LC carbs - I can't remember his name but you can search for them

 

[charliemeyer007]

I think this is where you should start Aisan Carb Rebuilding Videos - https://forum.ih8mud.com/threads/aisan-carb-rebuilding-videos.379609/

 

[cmcmill01]

So took the air filter off and had a good look at the carburettor nozzles, and only one is squirting liquid when the accelerator is opened up.
What is the best and easiest way to clean this jet?

Reading more about this, looks like the 2nd venturi does open until the car is flat out, and a vacuum is created!! Thanks @charliemeyer007

 

[65swb45]

Nobody has mentioned that this is a Chicom carb, notorious for having junk in them even when they’re brand new. Cleaning it is not guaranteed to solve your problem, but it can’t hurt.

Does your air cleaner fit properly? Your rig would have come with a world market 61011 carburetor, which is about 3/8” taller. I have a couple of the 61011 carbs available for sale, rebuilt by me, if you decide to go that route.

 

[charliemeyer007]

Second that. My new china Delco dizzy ran fine for a couple hundred miles. Then the rig started running a little rough. Adjusted the points and then it was back to running good. Another 100 or so miles, running rough again. Looked at the points - they are tweaked out of alignment. Put the old real Delco points and the bigger condenser from wore out Delco in - the rig hasn't run so good in decades.