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09-13-2017, 12:44 PM | #1 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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trouble shooting
Hello again. I took the ’29 cabriolet for my first drive with my wife and dog Tuesday evening. It started easily and ran fairly decently for the first few minutes, but started missing and trying to die pretty quickly. The gas valve was turned on, the spark was advanced, the throttle lever was all the way back up, and the choke was in and turned out about 1/2 a turn. The only way I was able to get back home was by pulling the choke out and pushing it back in. That allowed me enough power to go forward until I had to do it again. There are twin Tillotson carbs and a newer distributor on the car, and I don’t know what has been done to the engine.
My question is: Where do I start to find out what’s wrong? I’m going to pull the timing gear cover and check the timing just to be sure. Then, I’m going to check the distributor and points, but I feel that a lot of the problem is the carbs. I have the original intake manifold and Zenith carb, but I hate to take off that Vortex manifold and carbs because I don’t have the original fuel line for the Zenith. The gas was fresh and good, and both screens in the gas tank and sediment bowl are clean and clear. I have two inline filters going to the carbs and they’re clean, so this is not a gas problem. I wish I knew what head and what bore the engine is, but I don’t. Thanks again for all the help you guys have given me. Mike |
09-13-2017, 12:57 PM | #2 |
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Join Date: May 2010
Location: Cape Cod MA
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Re: trouble shooting
Some in line fuel filters do not work with gravity feed as they require fuel pump pressure. Are you on gravity feed?
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09-13-2017, 12:58 PM | #3 |
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Location: Bay City Michigan
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Re: trouble shooting
check compression and generator and battery connections. a blown head gasket will let you run for ten minutes then 2 cyl will stop sparking due to coolant build up. if you have a loose gen connection and your battery loses connection your car will back fire and drive with nearly no power. it could be something else but I would check those two first.
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09-13-2017, 02:25 PM | #4 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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Re: trouble shooting
Yes, it is gravity feed, and if all else fails I'll bypass the inline filters. Thanks.
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09-13-2017, 02:43 PM | #5 | |
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Location: Cave Junction, Oregon
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Re: trouble shooting
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09-13-2017, 02:45 PM | #6 |
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Location: Virginia
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Re: trouble shooting
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09-13-2017, 03:05 PM | #7 | |
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Re: trouble shooting
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09-13-2017, 03:10 PM | #8 |
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Join Date: Jun 2013
Location: Western Springs, IL
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Re: trouble shooting
This sounds to me like a fuel starvation issue. The inline filter(s) may not be flowing enough fuel to feed both carbs. When you said that pulling up on the choke lever, it ran better, that seems to solidify, to me, a lack of fuel.
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09-13-2017, 03:11 PM | #9 |
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Join Date: May 2010
Location: Cape Cod
Posts: 1,128
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Re: trouble shooting
Some of the older gas caps did not have good venting. Try removing the gas cap and see if it runs O.K. If so, then you need a new gas cap.
Marc |
09-13-2017, 03:24 PM | #10 |
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Join Date: Jun 2017
Location: Walla Walla, WA
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Re: trouble shooting
Wingski:
It never fails. You do all that work and load up the wife and dog, and then it happens. I did a bunch of work and took my wife out for a drive one night and my generator was not genning, and by the time we got home, I almost had to hold a match up to the lights to see if they were on. On top of that, something else went haywire too. So much for impressing my wife with all the work. All fixed now, but geez. |
09-13-2017, 03:28 PM | #11 |
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Join Date: Sep 2017
Location: Oxford, MS
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Re: trouble shooting
I agree that vapor lock may be the issue. Fuel filters clogged are also an easy thing to check as well as a tight connection along the exhaust system from manifold gasket to the tail pipe opening.
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09-13-2017, 03:48 PM | #12 |
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Join Date: May 2010
Location: moorhead minnesota
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Re: trouble shooting
Fuel lines are cheap. I'd put the original manifold and single carb back on. Setting one carb and trouble shooting it would be way easier than two.
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09-13-2017, 04:19 PM | #13 | |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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Re: trouble shooting
Quote:
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09-13-2017, 04:24 PM | #14 |
Senior Member
Join Date: Jul 2017
Location: Cave Junction, Oregon
Posts: 432
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Re: trouble shooting
Hey Rebel, now that is what a parade car should look like. If I saw you go by, I'd have to follow you so I could shake your hand and congratulate you.
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09-13-2017, 04:26 PM | #15 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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Re: trouble shooting
Marc, that's the first thing I checked, and it is venting properly. Thanks, Mike.
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09-13-2017, 04:29 PM | #16 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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Re: trouble shooting
Thanks, Frank, but I really would like to see what these Tillotson's do compared to the Zenith.
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09-13-2017, 04:32 PM | #17 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
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Re: trouble shooting
Keep those comments coming, guys. Right now, I'm removing two scratches in my windshield so the A doesn't have to run.
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09-13-2017, 05:46 PM | #18 |
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Location: Santa Rosa, CA
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Re: trouble shooting
Retorque the manifold; besure it is properly installed, gaskets to block and carb, etc.
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09-13-2017, 06:56 PM | #19 |
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Re: trouble shooting
With so much stuff ADDED/MODIFIED/ETC, how in the world could you even begin to DIAGNOSE the problems?????
Bill W.
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09-13-2017, 07:11 PM | #20 |
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Re: trouble shooting
Very simple problem. If you had to choke it to run, then you have a lack of fuel. Either to the carburetors, or thru the carburetors. Don't touch the electrical system. Pulling the choke starves it for air, and it runs because it is starved for fuel.
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