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390 has miss at all throttle speeds

This is a discussion on 390 has miss at all throttle speeds within the Mechanical and Engine Tuning and Mods forums, part of the Tech Forums category; Have newly rebuilt 390 with 2000 miles on it. Has new plugs, wires, points, condenser, vacuum advance. Timing, dwell, points, ...

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  #1 (permalink)   IP: 98.231.39.75
Old 12-30-2014, 08:42 AM
 
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kapejo is on a distinguished road
390 has miss at all throttle speeds

Have newly rebuilt 390 with 2000 miles on it. Has new plugs, wires, points, condenser, vacuum advance. Timing, dwell, points, and plugs are all within spec. Cap and rotor appear to be in excellent condition. Checked running motor at night .... no fireworks.
Engine has a miss at idle and throughout throttle range. It has poor acceleration. Any thoughts on to proceed or troubleshoot?

Thanks,
John
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  #2 (permalink)   IP: 108.35.51.254
Old 12-30-2014, 11:26 AM
 
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Can you bring motor back to rebuilder? That could be various things. Is dizzy put in correct not 180 degrees out? I would advance timing and see how it reacts. wires on in correct locations? Vacuum leak?
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  #3 (permalink)   IP: 108.35.51.254
Old 12-30-2014, 12:08 PM
 
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Also what is condition of Carb??
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  #4 (permalink)   IP: 69.34.132.209
Old 12-30-2014, 12:52 PM
 
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Make sure the no. 6 plug wire is between nos. 7 and 8 on the wire loom. 7 and 8 need to be kept as far as part as possible to avoid missfires.

Terry
64HT
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  #5 (permalink)   IP: 98.231.39.75
Old 01-06-2015, 06:47 PM
 
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390 Misfire

Thanks Terry....your post resolved my issue.

John
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