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Old Jan 20, 2004 | 06:55 PM
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From: old tappan n.j.
Default weak spark

my car seems to be suffering from weak spark anyone ever have this problem let me know

george
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Old Jan 20, 2004 | 08:15 PM
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Stock ignition system is pretty solid. How do you
figure it's weak spark?
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Old Jan 20, 2004 | 08:31 PM
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I agree.These LS1's have a great ignition system.If you think the spark is week,then it's probly the wires or plugs.
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Old Jan 20, 2004 | 08:54 PM
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The one time I thought I had a bad coil pack it turned out to be a suddenly defective spark plug.

Change the plugs, change the wires, and then blame the coils...in that order.
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Old Jan 20, 2004 | 09:52 PM
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I agree w/ the general consensus weak spark is not a common complaint on GEN-III motors.
What is the vehicle doing that you think it is weak spark?
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Old Jan 21, 2004 | 08:18 PM
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i have new plugs and wires on the car i think its weak because i do a open air spark test with a plug in the wire and the spark looks weak not bright blue like a old style hei ignition so id consiter it weak

george
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Old Jan 21, 2004 | 08:37 PM
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George, do all of the sparks look the same or is one visibly weaker than the others? With the individual coil packs of the LS1 they shouldn't all suffer at once. You would most likely have only one coil pack of the 8 go bad. Two at once would be an extreme coincidence and more than that would be of astronomical chance.

BTW, that bad plug I mentioned that went bad on me wasn't very old. Sometimes (but not often) they're bad right out of the box.
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Old Jan 22, 2004 | 02:53 PM
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all spark is the same and 2 sets of plugs im on i have fule but it wont fire under high compression

george
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Old Jan 22, 2004 | 07:00 PM
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Plugs could be overgapped? You can check for quality of grounds
(and/or +12V supply?) to the coil packs. Also need the plug to be
well grounded to the block, without a good current return you will
not get a strong spark. Brightness = current.
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