Mystery stalling issue with 34-3

[ccowx]

I have a 1971 Westy that has decided to start stalling or nearly stalling when you stop or turn a corner. Sometimes worse than others, but not good. It is worse by far when it is warmed up. I have played with the carb settings til I am blue in the face, I have raised the float level and I have checked for vacuum leaks in the engine compartment. I have been told that sometimes a leaky power brake booster can do this, though the brakes work fine. I have replaced the hose from the hard line to the engine but I have not done the one from the hard line to the booster itself. I am not confident in that, so I will replace it tomorrow.

So, all that being said, can anyone think of anything I might have missed? If this doesn't turn out to be it, I am at a complete loss.

Chris

[oprn]

Can you block off the line to the brake booster completely just for a test? That would eliminate a leaky booster diaphragm as well as the lines.
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[FarmerBill]

Yes, what oprn said. Disconnect your booster line at the manifold and cap the manifold. Let your engine warm up and take it for a ride, just be aware your brakes won't work as well. If you dont stall you figured it out.

I had a 71 bay 25 years ago with carb troubles that were booster related, replaced the lines and got a rebuilt booster and all was good. Those power disc brakes are nice.

[ccowx]

They are darn nice, I will admit! Unfortunately, as the vehicle becomes more complicated some of that golden simplicity starts to disappear!

Thanks, I will be going vacuum leak hunting tonight.

Chris

[busdaddy]

Tell us more about the rest of the engine compartment, stock aircleaner?, preheat hooked up and functional?, battery securely attached to it's tray?, harness that runs across the back of the shroud to the coil secured in it's tabs?, or dangling low and near the throttle cable?

How's the end play in this engine?
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[ccowx]

Believe it or not, it is a stock 71 spec dual port with all the things you mentioned, including air cleaner and wiring and everything. It just came off break in and has about 400 miles on it. This is why I am saying mystery! I am sure that I am going to be chasing a vacuum leak. Tomorrow night's project!

Thanks!

Chris

[FarmerBill]

I looked at your pictures and it looks like you have an oversized crimp connector on the wire to your cut off jet? If that's the case you could have an intermittent short causing your problems. If there's no vacuum leak I'd check that out.

[Millionmph]

9/10 times stalling problems are timing related and not carb (ie lack of initial); I would verify everything ignition-wise first before looking at carb;

[ccowx]

Timiing is good, but I was planning to triple check that, as yes, most carb issues are actually timing! As for the crimp and pictures, I am not sure what pics you are looking at? I will check that, though I am pretty sure it's ok. I used pliers to tighten it up not long ago.

Thanks guys, more will be known later today.

Chris

[doublecanister]

Hey Chris,

I had this very similar problem on my 73 Thing that was with a pict 31 carb when purchased.

Would run, idle and drive fine but come to a stop or turn (usually just trying to stop) and it would cut off or almost cut off engine if I didn't feather the pedal.

Found problem was a stuck anti-diesel solenoid and a plain dirty carb - which led me to find a rusty gas tank that was pre-ethanol sealed - said sealer was now melting inside, ended up plugging the tank - a mess is what it was -apparently the PO ran cheap gas and let it sit to much.

Hope any of this helps!

T
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2020 - Mustang Eco Boost [High Performance]
1973 - Thing
1966 - Mustang GT- Fastback
1951 - Ford F1 pickup Flathead V8