The Ford Barn

F-ONE · 09-10-2020, 09:16 PM

1. Vacuum leak
It's quite common to see multiple carburetor gaskets on flathead intakes. 2 fresh gaskets are OK but I have seen as many as 4. Maybe this is simply by accident. The bottom gasket has a tendency to stick hard to the intake requiring it to be shaved off with a razor.

What I'm getting at is it's real easy to leave a old gasket on the intake or leave pieces of it. This could cause a vacuum leak.
There's other areas that could cause a vacuum leak, for instance, a bad hose to the wiper motor.
2.
Carburetor out of adjustment...
As mentioned the float could be out of adjustment.

You need to check the choke linkage. The choke linkage first goes to high idle and as the cable is pulled further it closes the choke plate. Check the linkage and make sure the choke is not partially pulled out or in other words, make sure returns fully closed.
Check the throttle linkage.
Ford 94s have a 3 position mixture adapter on the accelerator pump. Rich, Lean, Middle. This is for different elevations and temperature. It's something to check and make sure.
Idle mixture screws... You need to set these with a vacuum gauge. If these are difficult to set, that's a clue you have a vacuum leak.
3. Out of time
Make sure the engine is in time. It's best to set the timing with a light. Put the pointer on the pulley dot.
I have found out that these can fool you by setting it by ear even with a vacuum gauge.
4.
Electrical connections...
Make sure you have good and tight connections. A positional connection that has poor intermittent contact will drive you nuts as it works sometimes, sometimes not.
5. Fuel supply...
Check for clogged filters, kinked hoses, dirty gas tank and or a weak fuel pump.
6. Tune Up...
Go over all the tune up data and procedures again. Point and plug gap can have a big affect on these.
It would also be a good idea to do a compression test. This will tell if your valves need adjustment. A vacuum gauge can as well, especially if the needle flutters.

09-10-2020, 09:16 PM	#12
F-ONE Member Join Date: Aug 2020 Location: Heart of Dixie ( Alabama) Posts: 65	Re: She looks good but she doesn’t run so good 1. Vacuum leak It's quite common to see multiple carburetor gaskets on flathead intakes. 2 fresh gaskets are OK but I have seen as many as 4. Maybe this is simply by accident. The bottom gasket has a tendency to stick hard to the intake requiring it to be shaved off with a razor. What I'm getting at is it's real easy to leave a old gasket on the intake or leave pieces of it. This could cause a vacuum leak. There's other areas that could cause a vacuum leak, for instance, a bad hose to the wiper motor. 2. Carburetor out of adjustment... As mentioned the float could be out of adjustment. You need to check the choke linkage. The choke linkage first goes to high idle and as the cable is pulled further it closes the choke plate. Check the linkage and make sure the choke is not partially pulled out or in other words, make sure returns fully closed. Check the throttle linkage. Ford 94s have a 3 position mixture adapter on the accelerator pump. Rich, Lean, Middle. This is for different elevations and temperature. It's something to check and make sure. Idle mixture screws... You need to set these with a vacuum gauge. If these are difficult to set, that's a clue you have a vacuum leak. 3. Out of time Make sure the engine is in time. It's best to set the timing with a light. Put the pointer on the pulley dot. I have found out that these can fool you by setting it by ear even with a vacuum gauge. 4. Electrical connections... Make sure you have good and tight connections. A positional connection that has poor intermittent contact will drive you nuts as it works sometimes, sometimes not. 5. Fuel supply... Check for clogged filters, kinked hoses, dirty gas tank and or a weak fuel pump. 6. Tune Up... Go over all the tune up data and procedures again. Point and plug gap can have a big affect on these. It would also be a good idea to do a compression test. This will tell if your valves need adjustment. A vacuum gauge can as well, especially if the needle flutters.