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71 240Z Partial throttle misfire.

Old 11-13-2012, 07:45 PM
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Question 71 240Z Partial throttle misfire.

So here's the story. While under partial throttle I am noticing a terrible miss, usually happening at low revs (<3000) and only when the engine is at operating temperature. Almost feels like I am running out of fuel however when I fully open the throttle it goes away almost instantly. Any Ideas?
Stock L24 with E31 head.
Timing: 12 deg adv. @ idle
Points gapped @ .017
Accel E-Coil
NGK Plugs
Carbs tuned roughly 3 months ago.
Dampers filled with straight 30 wt oil
Valves adjusted 4 months ago .010 intake .012 exhaust

Thanks in advance!
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Old 11-13-2012, 09:16 PM
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Location: Ben lomond Calif
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Is this dual point or single point system you have.? If dual are both sets of points gaps still matching ? Have your points moved from where you set them up?
Vacuum leak on or near the intake manifold fitting/ hoses?
I would run the car in a dark garage and check the dist cap for cracks by looking for flash/ light visble to the outside.
Chk the coil/ dist cap and all spark plug wire connections.
Does the ballast have a crack in it? Replace it if req'd.
Good luck with this.

Last edited by victor askew; 11-13-2012 at 09:28 PM.
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Old 11-14-2012, 02:32 PM
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Problem Solved. So apparently I have neglected my ignition system and my points gap was only .012 which in-turn fried my Accel E-Coil that was less than 6 mos old. Luckily, I work at a local parts house and picked up a Flamethrower coil, a set of Accel spiral core 8mm wires and a new set of NGK plugs for $60. Swapped it all out at lunch today and the car runs amazing, she has a willingness to rev that I have never felt before. Pulls hard in 4th from 1200 Rpm with no complaints.
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