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Old 02-04-2012, 11:33 AM
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lost spark

I'm new in here I have an 87chevy 305 lost spark changed coil have power in n out but no spark from coil. Now what
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Old 02-04-2012, 11:39 AM
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Quote:
Originally Posted by ragguy
I'm new in here I have an 87chevy 305 lost spark changed coil have power in n out but no spark from coil. Now what
Replace the module w/a known good one if you have one around. The other thing in the distributor that can cause a no start condition is if the pick up coil has gone bad or has a broken lead going to the module. This isn't as common as a bad module, though.
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Old 02-04-2012, 11:43 AM
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Where do I find that module I changed the pickup also
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Old 02-04-2012, 11:47 AM
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I think it was the pickup.it was the box under cap that coil wires hook into
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Old 02-04-2012, 11:51 AM
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Module (there's also a 5-pin module looks like the 4-pin):



Pick up coil:

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Old 02-04-2012, 11:55 AM
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Wow pics and all thanks.ya I changed to module
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Old 02-04-2012, 12:00 PM
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New doesn't necessarily mean "good".

Check the PU coil first:

http://www.73-87.com/7387garage/drivetrain/pkupcoil.htm

You don't have to remove the distributor to test it, you do need to disconnect the module from it before checking the resistance. If it's bad the distributor will need to be removed.
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Old 02-04-2012, 12:04 PM
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K I'll go check that n let u know thanks for you're help
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Old 02-04-2012, 12:28 PM
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When you replaced the coil, was the part below in place and in good shape?



The carbon brush on the left goes in the cap first, then the rubber gasket. Should have dielectric grease both sides of washer, then the coil goes over them both.
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Old 02-04-2012, 12:32 PM
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Its an external coil
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Old 02-04-2012, 02:45 PM
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Ok bought new cap n rotor.I have spark out of coil but nothing at plugs
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Old 02-04-2012, 02:53 PM
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Quote:
Originally Posted by ragguy
Ok bought new cap n rotor.I have spark out of coil but nothing at plugs
If you have spark at the coil but not at the plugs either the rotor or coil wire are no good or installed wrong or the coil wire is no good. Is this a small cap HEI setup or something aftermarket.
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Old 02-04-2012, 03:10 PM
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I have new cap rotor coil its a small cap.I tried 3 dif coil wires
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Old 02-04-2012, 06:50 PM
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Quote:
Originally Posted by ragguy
I have new cap rotor coil its a small cap.I tried 3 dif coil wires
Wrong rotor, is a possibility. If you still have the old one compare it. If there is spark at the coil it travels through the coil wire to the rotor and back out the end of the rotor to the plug wires. Not a lot that could go wrong that would affect all cylinders.
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Old 02-05-2012, 10:07 AM
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Ok after cap button coil module got fire ran revd 2 times Los spark at coil have any ideas
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