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mitch1965 · 05-24-2009, 09:23 PM

Connect your timing light, one at a time, to each plug wire, and crank the engine. The light will flash if there is spark to the plug.
I have had modules last over 10 years, and others crapped out after only a couple months. I helped a buddy with his truck that had no spark. He drove it fine one day, then it would not start the next day. Bad module. I think Auto Zone, or the other parts stores can test them, but I'm not positive.

05-24-2009, 09:23 PM	#4
mitch1965 Registered User Join Date: Oct 2004 Location: Fort Collins, Colorado Posts: 376	Re: 73gmc - won't start Connect your timing light, one at a time, to each plug wire, and crank the engine. The light will flash if there is spark to the plug. I have had modules last over 10 years, and others crapped out after only a couple months. I helped a buddy with his truck that had no spark. He drove it fine one day, then it would not start the next day. Bad module. I think Auto Zone, or the other parts stores can test them, but I'm not positive. __________________ '99 K1500 Tahoe, 2dr, barn doors - 350/ 4L60E, 3.73 '01 K2500HD Silverado Ext Cab - 496/ Allison, 4.10 Last edited by mitch1965; 05-24-2009 at 09:24 PM.