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Old 11-09-2017, 10:58 AM   #1
Sick5
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Exclamation Gmc v6 ignition problem

Buddy of mine is having spark problem and im trying to fig out how to solve his issue. No spark. V6 points. I started with the coil it has 12 volts going in. I turn the truck over and no spark at the plug. Replaced the coil and still no spark. Is there amything else i sshould be Looking at.
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Old 11-09-2017, 11:07 AM   #2
WorkinLonghorn
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Re: Gmc v6 ignition problem

Replace the points and condenser. Set the dwell to spec.
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Old 11-09-2017, 11:16 AM   #3
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Re: Gmc v6 ignition problem

condenser is that round thing in the cap with a wire going to the points.?
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Old 11-09-2017, 11:17 AM   #4
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Re: Gmc v6 ignition problem

what happens if I still don't get any spark?
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Old 11-09-2017, 11:31 AM   #5
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Re: Gmc v6 ignition problem

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what happens if I still don't get any spark?
There should be a ballast resistor wire that limits the voltage to about 9 volts. 12v into the coil damages the condenser and points. If there is still no spark after all parts are replaced correctly then the distributor is internally grounding somehow. Then you swap out the distributor for another. You need to get a service manual that guides you through trouble shoots. Or do more research online. There is another site you can also post for help. Jollys gmc guy site http://6066gmcclub.com/index.php
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Old 11-09-2017, 11:59 AM   #6
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Re: Gmc v6 ignition problem

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There should be a ballast resistor wire that limits the voltage to about 9 volts. 12v into the coil damages the condenser and points. If there is still no spark after all parts are replaced correctly then the distributor is internally grounding somehow. Then you swap out the distributor for another. You need to get a service manual that guides you through trouble shoots. Or do more research online. There is another site you can also post for help. Jollys gmc guy site http://6066gmcclub.com/index.php

I checked the incoming power to the coil and that 11 to 12 volts. is their a resister on the wire from the ignition switch?
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Old 11-09-2017, 12:30 PM   #7
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Re: Gmc v6 ignition problem

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Originally Posted by Irishbleueyes View Post
There should be a ballast resistor wire that limits the voltage to about 9 volts. 12v into the coil damages the condenser and points. If there is still no spark after all parts are replaced correctly then the distributor is internally grounding somehow. Then you swap out the distributor for another. You need to get a service manual that guides you through trouble shoots. Or do more research online. There is another site you can also post for help. Jollys gmc guy site http://6066gmcclub.com/index.php
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I checked the incoming power to the coil and that 11 to 12 volts. is their a resister on the wire from the ignition switch?
See anything like this on the firewall?:
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Old 11-09-2017, 12:40 PM   #8
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Re: Gmc v6 ignition problem

Make sure the points are adjusted correctly. Around .017", I believe?
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Old 11-09-2017, 01:10 PM   #9
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Re: Gmc v6 ignition problem

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See anything like this on the firewall?:
this is before the coil correct and if this is damaged I wouldn't get any power to my coil?
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Old 11-09-2017, 01:35 PM   #10
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Re: Gmc v6 ignition problem

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Old 11-09-2017, 01:39 PM   #11
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Re: Gmc v6 ignition problem

Standard troubleshooting procedure:

Take off the distributor cap so you can see the points. Turn on the ignition switch and rotate the engine by hand until the points are open. Now use a multimeter or test lamp to check for power at both the (+) and (-) terminals of the coil. If no power on either one, you have a break somewhere between the coil and the switch. Work backward toward the switch, checking at each point where there is a terminal or connection until you find the break.

If you have power at (+) but not at (-), disconnect the lead going to the distributor. If you have power at (-) now, you have a short to ground somewhere in the distributor or the connecting wire. If you still have no power at (-) with the lead disconnected, you have an open coil primary, but this is VERY rare.

If power at both (+) and (-), turn the engine by hand until the points are closed. Now you want to see power at (+), but not at (-). If you still see power at both terminals, you have a break between the coil and the distributor, or else the points aren't making contact.
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Old 11-09-2017, 03:08 PM   #12
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Re: Gmc v6 ignition problem

For about $75.00 you can change out all the internal components with Petronix Electronic Ignition, I did mine 6 years back and have not had any problems with it.
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Old 11-09-2017, 03:34 PM   #13
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Re: Gmc v6 ignition problem

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For about $75.00 you can change out all the internal components with Petronix Electronic Ignition, I did mine 6 years back and have not had any problems with it.
I would if it was something i get locally. I meed to get it running asap
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Old 11-09-2017, 04:17 PM   #14
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Re: Gmc v6 ignition problem

call NAPA or ORielles you can go and order it from their website as well.
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Old 11-09-2017, 11:14 PM   #15
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Re: Gmc v6 ignition problem

Ok i pulled the dizzy out cleaned it and put it back. Started fine. Went for a ride drove a block away and shut off.. wouldnt start till 5 min of sitting
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Old 11-09-2017, 11:18 PM   #16
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Re: Gmc v6 ignition problem

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Ok i pulled the dizzy out cleaned it and put it back. Started fine. Went for a ride drove a block away and shut off.. wouldnt start till 5 min of sitting
Ya sounds like you need a new distributor... unless your not getting fuel.?.?.?
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Old 11-09-2017, 11:53 PM   #17
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Re: Gmc v6 ignition problem

Yeah im getting fuel.. what would cause that?
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Old 11-09-2017, 11:55 PM   #18
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Re: Gmc v6 ignition problem

Do tgis dizzy have a pick up?
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Old 11-09-2017, 11:56 PM   #19
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Re: Gmc v6 ignition problem

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Yeah im getting fuel.. what would cause that?
When it fails, you need to immediately check and see if you still have power to the coil. To rule out bad ignition switch. Could be broken wire inside dizzy..
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Old 11-10-2017, 12:27 AM   #20
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Re: Gmc v6 ignition problem

So.maybe the wire that goes from the coil to the inside of the Distributor
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Old 11-10-2017, 08:33 PM   #21
Irishbleueyes
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Re: Gmc v6 ignition problem

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So.maybe the wire that goes from the coil to the inside of the Distributor
Could be the condenser, even the new ones fail. Make sure its made in USA..
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