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EFV-8 Club Forum / General Ford Discussion / Backfiring Motor

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Discussion Topic: Backfiring Motor

V8JR

01-19-2020 @ 5:48 PM

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Having trouble getting '39 Ford to run smoothly. Has what sounds like backfires while under load and engine feels kind of mushy when applying throttle. Running Stromberg 97 carb and standard point ignition. Thanks for any ideas - V8JR

01-19-2020 @ 6:56 PM

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What have you done? Did this condition just start happening all of a sudden? Have you changed anything or done anything recently to to car?

TomO

01-20-2020 @ 7:01 AM

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Check your spark on all 8 plugs, at idle you should have a blue, 1/2" spark when a plug wire is held near a head nut. If it is short or orange in color, your condenser could be weak or the coil could be going bad.

Do you have a dwell meter or vacuum gauge?

Check the vacuum for conditions shown in the diagram on this link:

http://www.secondchancegarage.com/public/186.cfm

Tom

37RAGTOPMAN

01-20-2020 @ 10:26 AM

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try replacing the condenser , or look for loose connections,in your primary ignition wiring,
back of ignition switch terminals
any connections , dirty loose corroded connections,
also on the resister,
do you have a voltmeter ?
if you have weak spark at the spark plugs, it could be the coil,
I had a similar problem and ran a jumper wire across the resister and it pick up speed,
do this only for a few seconds,
you should have about 3 volts going to the ignition coil,
hope this helps 1937RAGTOPMAN

V8JR

01-20-2020 @ 8:17 PM

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Thanks for the hints. It did start all of a sudden, It did have some wetness around the carburetor top - maybe running to rich all of a sudden? - V8JR

supereal

01-22-2020 @ 1:40 PM

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The usual cause of backfiring is a vacuum leak in or near the intake manifold. It can be a faulty gasket under the carb, or any connection to the manifold, such as a cracked or loose wiper hose, or the connection to the distributor for the snubber. Be sure all gaskets in the 97 carb are leak free, and the emulsion tubes aren't leaking. Those carbs are sensitive to these leaks. That is one reason they were replaced.

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