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jnrwood
New User
Oct 1, 2011, 3:34 PM
Post #1 of 7
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coil and spark problem
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Hi, we have a 1997 gmc sierra p/u truck.It has a 350 ci engine.
The problems with this truck started on wet and rainy days. It would be hard
to start and then run rough until it dried out. We have replaced the coil,
wires, dist cap and rotor. I suspect we got a bad coil because, when you crank it, a spark is visible
coming from the base of the top terminal (high voltage) on the coil, going to the square metal plates that make up the
body of the coil. the spark appears to be coming right thru the plastic at the base of the high voltage terminal,
the one that leads to the distributor. I know thats not right. When spark is checked at the plugs,
its there, but appears weak- sort of an orange color.
The question is, could there be something that is causing these coils to go bad, within the distributor,
for instance, or did we just get a bad coil? thanks, jon
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 1, 2011, 4:00 PM
Post #2 of 7
(2878 views)
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Re: coil and spark problem
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The coil is likely cracked but make sure you don't have excessive resistance in the secondary wiring.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 1, 2011, 5:09 PM
Post #4 of 7
(2860 views)
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Re: coil and spark problem
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No, those things would be the primary side of the circuit. The secondary is the coil wire, ignition wires and plugs. I know you said you changed them but heavy corrosion at any contact will increase resistance.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jnrwood
New User
Oct 1, 2011, 5:20 PM
Post #5 of 7
(2856 views)
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Re: coil and spark problem
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10-4, will check it out tomorrow
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jnrwood
New User
Oct 2, 2011, 3:17 PM
Post #6 of 7
(2836 views)
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Re: coil and spark problem
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Ok, you were right. Checked the resistance on high voltage wire- coil to distributor
and it had "infinite" ohms. Was new one year ago- bosch premium wire. Found the
old one (wire) up at the shop, and the thing started right up, and runs good, with the same coil.
how does that happen? the wire looks fine, but... anyway, thanks hammer time,
we're cruisin now!
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 2, 2011, 3:31 PM
Post #7 of 7
(2832 views)
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Re: coil and spark problem
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Just normal deterioration. The better the quality wires, the longer they will last.
Glad to he you got it resolved.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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