New Guy

[William Kelchner]

Hello, just joined the forum which appears to be a treasure trove of information. I own a 30 Roadster and a 64 Impala convertible.

Bought the Model A years ago and been fiddling with it ever since--had overheating problem among other problems. To date I've installed a new radiator, fixed the speedo, new speedo cable, replaced the small gear at the transmission to accept the new cable, new water pump, new exhaust, has hydra brakes, new carb (Zenith), replaced the radiator shroud with one I found at Carlisle, Pa. auto show for $40 (had two minor cracks at the bottom and no dings, the cracks are completely hidden by the stone guard - could not believe the luck in finding this buried in a pile of parts.

Now the overheating appears to be under control. I just installed new plugs and retimed the machine. The only thing I cannot fix is after cruising around it backfires one time about 10 seconds after turning off the ignition. If I run the carb dry no backfire. I presume this is a rich condition but I've tried everything with the carb without success.

Any suggestions. Thanks Bill

[Gary WA]

Check for cracked manifold or leaking gasket (manifold). Good luck keep us posted.

[William Kelchner]

Thanks - I'll give that a whirl.....cheers

[BashawT]

Welcome to the forums

[William Kelchner]

I presume we are talking about the intake manifold being cracked
or getting extra air?? Tnx

[Gary WA]

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Exhaust manifold! especially where it curves down toward muffler connection,back side. Broken ear/bolt area or loose bolts.

[foxfire42]

If you have a 1930, how well did that shroud fit? The shroud was used on 28/29 style radiators not the taller 30/31's

AAhhhhhhhhhhhh, you call the raditor shell a shroud.....Sorry

[William Kelchner]

Thanks, looks like tomorrows project....cheers

[VWJoe]

Welcome to the "Barn". I'm just up the road

[joe plumber]

Welcome .

[TinCup]

Take some wd 40 and spray around the intake and the carb and listen for it to be effected by the extra fuel.

[jcheshire31]

Foxfire, I think what he means by "shroud" is actually the radiator shell since he said the stone guard hides the cracks.

[Tom Wesenberg]

I turn the fuel off, then push the spark lever up, then turn the key off. This will slow the idle and you'll have less raw gas drawn into the engine, which might help your backfire problem.

[Jack '29 Sport Coupe]

I'll second everything Tom Wesenberg said. If this doesn' help, you might try adjusting the float level just a tad. Of course that shouldn't be a problem if you follow Tom's advice about turning off the gas.

Jack

[Leathernek]

Welcome to the "Barn!!!!"

[Mike V. Florida]

Welcome!
Sorry to hear about the Chevy
When my car did the same thing, backfiring, I went back through the the ingnition, checking the gaps on the dist, in the dist and went through the timing again. The problem went away.

I scared the hell out of my wife before I fixed the problem. I drove the car into the garage. Turned off the car by reaching in through the window, ran into the house and yelled duck, then the car backfired.

[William Kelchner]

Thanks to everybody, with all these suggestions one of them has got to be the solution.

[William Kelchner]

%@##&^ tried spraying WD-40 around the manifold and no noticeable change. One thing tht I have not addressed is that one of the small bolts that attach the intake to the exhaust manifold is broken off and the remaining portion of the bolt (threads) are still in the exhaust manifold. Sprayed around this area without success. Perhaps I should just remove the maifolds and fix this.

[1930artdeco]

If you did not get any change around the manifold I bet it is a slightly rich condition in the muffler. It is storing extra gas then when it gets hot after the motor is shut off, bang.

That is my story and I am sticking to it By the way, welcome and how about pics of the car?

Mike

[John LaVoy]

Welcome to the Model A hobby. I would suggest checking out a local chapter the members can be a great resource.