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Thread: 4160 870 cfm unpredictable flooding & stalling.

  1. #11

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    Gary, I've cleaned every ignition connection as well as tested the coil and magnetic pickup, but nothing found so far. Also, I tested plug wires. I'll be swapping out coil & pickup over the weekend. I'll let you know how I make out. Fred

  2. #12
    Join Date
    Jan 2010
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    Fred, you may need to rig up some LEDs as visible test leads to show if a 12V supply goes missing momentarily. Also check all your grounds are clean & tight. Gary
    Regards, Gary

  3. #13

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    Gary, problem solved. Bad coil. As soon as I swapped out the coil, ran like a champ. No more miss. No bogging. No stalling. Coil tested a little low on the Ohm test, but nothing else showed. Pickup tested fine also. Thanks for the help. I enjoyed every minute of the troubleshooting. I teach High School electrical engineering, so that helped with all the multimeter reading. I never put in the new magnetic pickup because I couldn't figure out how to do it. I thought it would just be a simple remove the two nuts and take it out. Apparently not. I couldn't find a good video on it. If you have any specific info on how to do it, please send it to me. Ghanks again. Fred

  4. #14

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    Quote Originally Posted by Fred G View Post
    Funny thing is that the car has a metal primary float and a plastic secondary. Don't know if this is normal?
    I just took an 870 GM Performance Parts 502 carb apart and it was metal front and plastic rear as well.

  5. #15
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    From the Holley website:
    "Use of brass floats on the secondary side of Model 4160™ carburetors factory equipped with nitrophyl secondary floats such as part number 0-3310C for Example, may cause the float to contact the metering plate resulting on loss of fuel control and flooding."
    Regards, Gary

  6. #16

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    Hmm. No plate. They come with a block.

  7. #17
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    Ah, so yours is a 4150. Seems Holley might be fitting the bowls as the same combination as a 4160.
    Regards, Gary

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