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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Slight pull on idle... fluctuating

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Old Jan 17, 2013 | 01:09 AM
  #1  
Ianmattf100's Avatar
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From: Longmont
Slight pull on idle... fluctuating

1963 223 3 on tree. Been running great however have noticed as of late there is a slight dip in idle every 2 - 3 seconds. Something is pulling on it. I though maybe a points to pertronix conversion would fix it. Added pertronix coil and ignition but its still doing it. The autolite carb was rebuilt by a pro 2 months ago. Had a radiator issue and truck got to about 210 on highway. I kind of noticed the fluctuation in idle just after this. I also had just recently added some stuff to radiator to stop heater core leak. Where should I start on testing? Could I have fouled a plug? Thanks guys
 
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Old Jan 17, 2013 | 09:13 AM
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Originally Posted by Ianmattf100
1963 223 3 on tree. Could I have fouled a plug? Thanks guys
Yes, that is a good place to start and check out the plug wires also.
 
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Old Jan 17, 2013 | 07:23 PM
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Old Jan 18, 2013 | 10:01 AM
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I would also check the ''air/fuel mixture on the carb!, even tho it is rebuilt it could need some fine tuning?
 
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Old Jan 18, 2013 | 12:20 PM
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Do you have a amp meter and if so does it fluctuated when the idle dips?
 
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