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08-24-2015, 09:16 PM | #1 |
Senior Member
Join Date: May 2010
Location: Virginia
Posts: 214
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What are syptoms of bad power valve in carb?
I have a 59A motor with 94 Model Carb. Engine developed miss in high rpm range-pulling in 2nd and 3rd gear. Checked out all suspected ignition related components-swapped coil/plugs/condenser-fairly new points gapped correctly. Starts up and runs good from idle to mid range. Wondering if a blown out power valve can appear at higher revolutions? Thanks in advance
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08-24-2015, 09:31 PM | #2 |
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Join Date: Dec 2012
Location: Massillon, Ohio
Posts: 783
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Re: What are syptoms of bad power valve in carb?
One of them is a severe stumble when you accelerate. The "miss" does not continue such as in your case
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08-24-2015, 09:45 PM | #3 |
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Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: What are syptoms of bad power valve in carb?
I agree with Joe. Another symptom of a bad power valve is leak down of fuel into the intake manifold resulting in hard starting and rich mixture producing sooty spark plugs. I suggest you check fuel delivery to the carb, which is different than fuel pressure. The "new" gas is causing interior rust in the line from the tank to the firewall. You can rig a temporary fuel source to confirm the diagnosis. I believe your change of ignition parts likely rules that out of the cause, in favor of fuel starvation.
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08-24-2015, 10:10 PM | #4 |
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Join Date: Oct 2011
Location: Gloucester VA
Posts: 1,042
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Re: What are syptoms of bad power valve in carb?
What type of air cleaner are you using? Is it maybe restricting air flow?
Lonnie |
08-25-2015, 12:03 AM | #5 |
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Join Date: Sep 2014
Location: oroville calif
Posts: 893
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Re: What are syptoms of bad power valve in carb?
constant fuel running into engine, causing flooding, missing and hard starting
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04-24-2024, 12:46 PM | #6 |
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Join Date: Sep 2010
Posts: 354
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Re: What are syptoms of bad power valve in carb?
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