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Old 07-11-2014, 10:42 PM   #1
1972GMCsierra4x4
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No spark on cylinder NO. 2??

So ever since I put a newer motor in my truck it's been a turd. I know that stock 350s are huge powerhouses, but it was bad enough I needed to check it out. So I pulled my plugs and saw that my number two cylinder was fouled up and wet. Voila, I found the right cylinder. I didn't have the tools to check compression so I tested for spark first and there isn't one. What could be causing this? I'm asking because I am running a Pertronix Ignitor II distributor, and I don't have much experience with them. I know all my wires, plugs and coil are good. Does anyone have thoughts on what could be the problem within the distributor?
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Old 07-11-2014, 11:01 PM   #2
Wrenchbender Ret
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Re: No spark on cylinder NO. 2??

Its either the plug wire or dist cap.
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Old 07-11-2014, 11:51 PM   #3
geezer#99
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Re: No spark on cylinder NO. 2??

Quote:
Originally Posted by Wrenchbender Ret View Post
Its either the plug wire or dist cap.
Or a cracked sparkplug!
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Old 07-12-2014, 12:13 AM   #4
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Re: No spark on cylinder NO. 2??

Timing light will tell you the culprit.
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Old 07-12-2014, 09:58 AM   #5
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Re: No spark on cylinder NO. 2??

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Originally Posted by jjzepplin View Post
Timing light will tell you the culprit.
Yeah, I've always used a timing light to test for spark in my vehicles. I just clamp it on the plug cable.

You can also hold the plug against a grounded surface and see if it sparks when cranking. If it does, then a compression check, or better yet, a leak down test would tell you if it's burnt valve, rings or valve guide fouling the plug. I've also found more new defective spark plugs recently than I recall ever having.
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