Carburetor issues

[andrewbridges1]

Hey yall I have a all stock 69 fj40 with a 1f engine. It surges really really bad at idle after installing new gaskets and backfires a little but when I let off the throttle. Seems to be lean and it died out on me after a good hit on the throttle. Seemed like it wasn't getting enough fuel so I raised the float a hair then it wouldn't start. Should ljust go ahead and put a Weber carb on it?

 

[cbmontgo]

Stick with the OEM.

 

[charliemeyer007]

Not a Webber guy. Have you watched the carb vids by one of the members? I forget his name, I don't run the stock carb.

Pinhead

Put the float level back in the proper position. Make sure your valves are set correctly. Check for vacuum leaks. Make sure timing is correct. Put a bottle of fuel dryer in the gas tank. Install a new gas filter - save the old one (dry it out in the sun for a few days) it will be good as new.

 

[andrewbridges1]

Not a Webber guy. Have you watched the carb vids by one of the members? I forget his name, I don't run the stock carb.

Pinhead

Put the float level back in the proper position. Make sure your valves are set correctly. Check for vacuum leaks. Make sure timing is correct. Put a bottle of fuel dryer in the gas tank. Install a new gas filter - save the old one (dry it out in the sun for a few days) it will be good as new.

Valves were just adjusted, how do I check for vacuum leaks? Timing is correct and fuel filter is new

 

[rkymtnflyfisher]

Check for vacuum leaks

This is the first thought that came to mind when I read the original post.


Stick with the OEM, it's worked for half a hundred years, why change it now?

 

[charliemeyer007]

My favorite way is to take a can of WD-40 with a pee tube. Lightly and quickly spray along the intake manifold gasket perimeter surface with the engine running - If the rpm's kick up there is the leak. You can spray the levels/joints in the carb too. Put a hemostat on the hose to the break booster.

 

[rkymtnflyfisher]

What gaskets did you replace?

That's where I would start.

Raising the float only adds more fuel to the bowl, doesn't do anything for delivery to the engine.

 

[Camotubebender]

Also Check for power at the idle solenoid if it has one

 

[andrewbridges1]

My favorite way is to take a can of WD-40 with a pee tube. Lightly and quickly spray along the intake manifold gasket perimeter surface with the engine running - If the rpm's kick up there is the leak. You can spray the levels/joints in the carb too. Put a hemostat on the hose to the break booster.

I don’t have a brake booster. It’s a 69

 

[andrewbridges1]

What gaskets did you replace?

That's where I would start.

Raising the float only adds more fuel to the bowl, doesn't do anything for delivery to the engine.

Right but when I looked at the carb it didn’t seem to have any gas in the bowl. I thought maybe it just didn’t get enough

 

[Camotubebender]

The idle solenoid cuts off the fuel flow into the carb when you turn the key off- so check that it has power when the key is on and it is working. You can hear it click when you turn the key on.

 

[andrewbridges1]

The idle solenoid cuts off the fuel flow into the carb when you turn the key off- so check that it has power when the key is on and it is working. You can hear it click when you turn the key on.

It has power. Surging is now mild. About to post a video. >>

 

[Camotubebender]

How’s the float level in the window?

 

[Camotubebender]

Did it have power at the solenoid and you fixed it or it always had power at the solenoid?

 

[Pighead]

That doesn't really sound like "surging" to me. It does sound a little rough, what's the RPM there?

Edit: and the tube from the port at the base of the carb, does that go to your vacuum gauge?

 

[andrewbridges1]

Did it have power at the solenoid and you fixed it or it always had power at the solenoid?

After reinstalling the carb I forgot to hook it back up. But I did and it got rid of the surging now it just barely idles and hangs onto idle

 

[andrewbridges1]

That doesn't really sound like "surging" to me. It does sound a little rough, what's the RPM there?

Unsure of the rpm the surging was caused by the idle solenoid but it sure does idle very rough and after revving it up it it hangs onto idle then dips below what idle should be

 

[Camotubebender]

After reinstalling the carb I forgot to hook it back up. But I did and it got rid of the surging now it just barely idles and hangs onto idle

Ok now all you have to do is go back and un-do any changes you made when you thought something was wrong with the carb. Start with the float make sure it’s close to the middle of the window

 

[Camotubebender]

You could show us some close-up pics of the carb so we could see if somethings hooked up wrong possibly

 

[Pighead]

now it just barely idles and hangs onto idle

Usually I fix that by adjusting the idle speed screw and the distributor timing. And the idle air screw