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05-27-2017, 10:44 PM | #1 |
Senior Member
Join Date: May 2010
Location: ontario,Canada
Posts: 451
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bucking and backfiring
Just wondering where a guy would do with a 1947 car (stock) when the car idles really nice but giving it the gas it bucks like its running out of gas, once its doing over 20 mph and you let off the gas it starts to backfire? Any ideas?
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05-27-2017, 11:33 PM | #2 |
Senior Member
Join Date: May 2015
Posts: 8,111
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Re: bucking and backfiring
I'm thinking a bad condenser....
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05-28-2017, 12:43 AM | #3 |
Senior Member
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Re: bucking and backfiring
Dirt in carby ,Could be low on voltage check if the spark is yellow on revving it up ,Ted
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05-28-2017, 09:01 AM | #4 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,426
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Re: bucking and backfiring
It could be a bad condenser since most available now are not made well. The points are generally burned if the condenser is failing.
Sounds like the idle circuit in the carb is working OK. The main metering circuit may have some blockage. The accelerator pump might not be working as it should. There also could be a power valve problem. The float valve could have a problem with blockage or adjustment of float is off. The fuel pump out put might be off or maybe a partial blockage or a crack in the fuel supply line circuit allowing air bubbles in. All are possibilities that will have to be eliminated, easiest one first till it's fixed. |
05-28-2017, 12:41 PM | #5 |
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Join Date: Dec 2010
Location: Port St Lucie Florida
Posts: 398
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Re: bucking and backfiring
I had a simular thing and it turned out the vacuum hose to the wiper moter went bad .
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05-28-2017, 01:56 PM | #6 |
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Join Date: May 2010
Location: MN
Posts: 7,053
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Re: bucking and backfiring
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A New NEW condenser. second new one. MMO down the carb for a bit at idle. Then fresh gas and MMO in the tank. Drove it 10 plus miles and it leveled out. No issues now. |
05-28-2017, 06:14 PM | #7 |
Senior Member
Join Date: May 2010
Location: ontario,Canada
Posts: 451
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Re: bucking and backfiring
Thanks guys, I will start at one thing at a time until I get it !!
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