ggreenwald

My 67 327 has developed a bad miss and is not burning all the fuel under load. I have changed everything electrical possible, plugs, wires, cap, rotor, coil, etc. No change. The only component I have not changed is the electronic points replacement unit (Pertronix) the previous owner installed. To eliminate this as a possible cause, I want to install a set of points.

My question, do I just run a single wire from the points to the positive side of the coil? Appreciate any help.

lars

Wire goes from the points to the negative side of the coil. Make sure you still have the ballast resistor installed in the positive feed circuit.

JohnZ

You might also check where the red power feed wire from the existing Pertronix unit is connected; it needs a full 12 volts to operate properly (especially at high rpm), and if it's connected to the coil (+) terminal, it's only getting 7-8 volts (assuming your ballast resistor is still installed).

ggreenwald

Thank you for the quick reply and proper wiring for the points. The Pertronix unit was wired directly to the negative and positive terminals on the coil and I do have the original ballast resistor in place. Not sure how it was running well prior to this problem. When testing the voltage on the positive side of the coil I read 4.81 VDC with the key in the on position and 10.30 VDC when cranking the engine. Thanks again for the support.

ggreenwald

Apologize for the previous post, I do not have a coil ballast installed, just the coil capacitor.

kenEDMUNDS

John, if you used a Pertronix, how would you wire it? I have installed a couple of them using the ballast resistor am not sure I am getting full performance. Also, I would not think a Pertronix would cause a miss-more like a run/no run situation?
Ken

Don SSDD

Could be a carb issue- bad float or accelerator pump?

Don

buns

I stole this diagram from JohnZ...............who apparently stole it from someone else on the forum..................hmmm....his name has escaped me for the moment.

Disclaimer: Apparently, even the people at Pertronix are not sure how to wire them so use this diagram with discretion.

62Jeff

That's exactly how I have mine wired

That diagram is probably the only thing I've done on the forum lately that doesn't sound like whining and complaining

piper

I have some information on this How do i attact something into my post I have scanned something i want to post thank You Ed

62Jeff

This thread should walk you through that...
http://forums.corvetteforum.com/show...t=post+picture

piper

I can not get it to work sh-- I have the direction on the Flame Thrower and the Pertronix and it said to leave the ballast resister along Just hook the red wire from the Ignitor to the ignition switch side of the resister and you still have the positive side of the coil wire going to the resister Maybe that is the way the picture shows it but I do not see the other wire I have two good pictures of it but I can not get them on
PS This is the 1.5 ohm Flame Thrower

62Jeff

Take a look at the bottom layout in that wiring diagram posted in this thread.

The red wire from the Pertronix goes to the ignition switch side of the ballast resistor.

The black wire from the Petronix goes to the negative side of the coil.

The coil side of the ballast resistor (the wire that goes to the + side of teh coil) should be moved to the other side of the resistor, where the pertronix red wire, and the ignition wire, are located.

The end result is you'll have 3 wires on the same terminal on the resistor, no wires on the other terminal on the resistor.

Don SSDD

And what Jeff says means is this wiring setup is not putting any current through the BR, but from a cosmetic point of view, it looks stock. You could remove the BR and just join the wires shown.

Don

piper

The direction for the Pertronix and the flame throws said,Do not take the ballast resister out of the mix. I have three things scanned now and I do not know how to post them but I can send them to anybody that want them and it shows that you do not wire it the way you say Mine is wired the way the direction are and was done 2 years ago and it is find Maybe lars can jump in

kenEDMUNDS

BUNS, thanks for posting the diagram.
KEn

62Jeff

Perhaps your Petronix unit had different requirements than mine did, since it is older it could even be a different style. Note that the diagram says it is for a Petronix Ignitor II, a different generation of Pertronix

gegnot

I'd also check the carb, if your plugs are fouled. If your not running your car often and using a Holley carb, it could be the problem.

ggreenwald

Thanks to all for the input and diagram. Installing the points did not correct the problem, so I will move on to timing and the fuel system. Quick question, I am still trying to determine if I have a ballast resistor. Where would it be located on a 67? I want to ensure I re-install the Pertronix correctly.

lars

Should be right on the firewall, near the wiper motor. If you read about 5 volts at the coil with the key on, you have a ballast installed.