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NAA missing under load

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Chicago Bob in IA

09-11-2012 07:50:09

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My NAA will miss when I go up a hill or put under load. But only after it has been running for a while. I replaced the plugs, wires, distributor cap rotor and coil. I'm going to replace the points and condenser. What else should I look for?

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36 coupe

09-12-2012 05:38:04

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
What did you use for new plugs.Do you think all those parts you replaced were bad?

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Larry NCKS

09-11-2012 16:48:12

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 Re: NAA missing under load in reply to Bill Radford, 09-11-2012 07:50:09  
I agree with fuel flow/mixture as a possible.
But I also believe, with LeoinMI, timing could be a problem. If the timing is too advanced, it will advance even further under high speed load.

Furthermore, a spark plug that fires well out in the open may not as the compression pressure increases. You didn't put Champion plugs in that engine by any chance did you? They are known to not work well in some engines, especially Ford engines of tis era.

As others have said, do some honest trouble shooting and post back.

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09-11-2012 16:36:55

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
Check the elbow on the end of the fuel line where it goes into the carb. The elbow itself has a little screen on it which can get clogged with rust, dirt, whatever.
I had a similar problem and after a full tune-up and many hours and $'s of parts, all that was wrong was this little screen clogged up.
Simple to check and might need cleaning anyway.

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09-11-2012 12:02:53

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
your problem sound slike fuel to me.. yet since you didn't trouble shoot and instead replaced 50-60$ of parts.. you are out that $$..

check fuel flow and float settings..

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09-11-2012 08:39:56

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
Trouble shoot then parts not parts then trouble shoot. #1 check for a good blue/white spark that will jump a 1/4 inch gap at all four plug wires. If you have that then that rules that out as the problem. #2 check for gas flow at the carb drain plug. Let it flow a few minutes catching the gas to look at ti for water/dirt/rust. #3 remove the gas cap to make sure the tank vent is not clogged up or the fuel boiling.
If all that is ok maybe time to check the valves one or more may need to be adjusted

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09-11-2012 08:25:33

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
Did you check for distributor shaft wobble? If the bushings are badly worn which could be aggravated under a load causing the points to skip. Just a thought. PJ

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09-11-2012 08:12:53

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 Re: NAA missing under load in reply to Chicago Bob in IA, 09-11-2012 07:50:09  
Could be a gas flow problem. Under load the carb may be too rich or too lean or the fule line may be partically blocked. Timing may be an issue as well. Just my 2 cents worth.

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