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EFV-8 Club Forum / 1940 Ford Discussion / car is running rough

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RAK402

04-15-2021 @ 6:15 PM

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o2bnkc,

I realized that I had a spare distributor in the trunk of the car (I keep one that has been timed and set up with me anytime I drive the car, as well as a spare coil).

This should answer your questions regarding the mounting of the condenser.

o2bnkc

04-15-2021 @ 7:37 PM

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They say a picture is worth a thousand words. Thanks for going to the trouble of taking and posting these pics!!!!!

A Proud Navy Vet

o2bnkc

04-15-2021 @ 7:41 PM

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I mentioned the vacuum line in my previous post because my convertible top is..........well , let's just say it doesn't work to well without my help. I don't think I have good vacuum. That's for later down the road, though.

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RAK402

04-15-2021 @ 9:18 PM

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o2bnkc,

You are welcome sir!

Does the vacuum line leak? That can make the engine run poorly.

40 Coupe

04-16-2021 @ 5:11 PM

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Your car is never going to run correctly with low vacuum. I suggest you put a vacuum gauge on and read. If it's running, ger it warm, you can also adjust the carb. idle mixture adjustment at the same time to get the vacuum as high as possible. Plus the vacuum gauge will give you a lot of hints as to what is going on.

o2bnkc

04-16-2021 @ 8:34 PM

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That's the stuff I need to know! Thanks!

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o2bnkc

04-17-2021 @ 6:17 PM

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Well, here's the latest. I put the new jets in my carb and with the rebuild it seems to have worked. I also installed the new original style coil and condenser. The car runs pretty good now. I think my main problem was the carb. I ran it some today and then pulled the plugs. Instead of being all sooty and black, they were fairly clean. The car ran ok. The only problem I am having now, is that it hesitates or stumbles when I first press on the gas. Even between shifts it stumbles when I press the accelerator. Any ideas on this little problem? Would the vacuum have anything to do with this? I have to get a vacuum gauge.

A Proud Navy Vet

This message was edited by o2bnkc on 4-17-21 @ 6:19 PM

RAK402

04-17-2021 @ 7:48 PM

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The vacuum line from the intake manifold/valve cover goes to your windshield wiper motor and the convertible top.

If it were my car, knowing that you have vacuum issues with the top, I would temporarily disconnect the vacuum hose leading into the firewall at the tube on the intake manifold, and install a short hose with a plug in the end on the tube. That will eliminate the old vacuum line as a source of trouble.

If it doesn't change anything, you will know vacuum was not the problem. If it runs fine after, then you have found the cause.

Please keep us posted sir.

carcrazy

04-17-2021 @ 9:01 PM

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If the car stumbles on acceleration, the accelerator pump may be delivering too much fuel. If the car hesitates on acceleration the accelerator pump may not be delivering enough fuel. Too much fuel can be shown by black smoke coming out of the tailpipe (you will need an outside helper to view this). Too little fuel in an extreme case can result in a backfire through the carburetor.

Did you add about 4 degrees of spark advance to compensate for the slower burning of the fuel at altitude?

TomO

04-18-2021 @ 7:43 AM

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I would follow RAK402's advice. If that does not fix the problem, check for proper accelerator pump operation, by looking down the throat of the carburetor, with the ignition OFF and operating the accelerator linkage. You should see 2 strong streams of fuel coming from the accelerator jets.

Tom

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