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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

1984 300-I6 PCV issues

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Old Jun 26, 2019 | 06:40 PM
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1984 300-I6 PCV issues

While my truck is running instead of the fresh air hose from the air cleaner to the oil cap having a slight suction to it to allow fresh air into the top of the motor it is blowing air back into the air cleaner.
I’ve replaced my PCV on my truck hoping that would solve the issue but it has not. I’ve confirmed that the bigger vacuum hose that goes from the PCV to the port under the carb does have a vacuum on it. Anybody have any thoughts on how to go about determining why the PCV isn’t working correctly?
 
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Old Jun 26, 2019 | 08:30 PM
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Sounds like the PCV valve is being overwhelmed?
 
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Old Jun 26, 2019 | 08:46 PM
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Originally Posted by ctubutis
Sounds like the PCV valve is being overwhelmed?
That’s what I was thinking but not sure what’s going to increase the pressure within the motor. I would understand if the vacuum port wasn’t drawing vacuum but it is.
 
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Old Jun 26, 2019 | 09:25 PM
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Excessive blow-by, caused by worn-out rings.
 
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