I have a 25d with a pertronix in it. It has run fine recently, but the Rover's been grounded for other issues for a couple of months. And now there's a problem. The main symptom seems to be (sounds like it's) not firing on 4 cylinders all or most of the time. And while it will start and run.it has very low power under load. Also noticed very rapid carboning of plugs.
After some diagnosis, its clear I have a weak, intermittent spark condition. All of which could support those symptoms. Also, I've noted a struggle with the plugs carbon-fouling even when I've reigned in some carb adjusment issues (Zenith). So while it's true that there could be other things going on, I'm confident that the root of my most immediate issues are ignition-related. And specifically this weak-intermittent spark problem.
Here's what I've tried:
New cap, new rotor.
Checked all multiple times: Power to coil and continuity of all connections and grounds, checked dizzy base plate ground, coil resistance, etc, etc, etc.
Set timing from scratch several times. Beer, gear (light) and ear.
Tried 2 new coils, new wires.
So, even though it is somewhat unlikely, given how little could go wrong with it, that the problem must be the pertronix unit. (I'm still researching some way I might test it.)
Obviously I can dig out a set of points (if I can find them) swap them in and try that. But I'd have to find them (and condenser and that plastic lead thing) and try and remember how to mount and set them ...
So while I mull my next step, any other insight?
After some diagnosis, its clear I have a weak, intermittent spark condition. All of which could support those symptoms. Also, I've noted a struggle with the plugs carbon-fouling even when I've reigned in some carb adjusment issues (Zenith). So while it's true that there could be other things going on, I'm confident that the root of my most immediate issues are ignition-related. And specifically this weak-intermittent spark problem.
Here's what I've tried:
New cap, new rotor.
Checked all multiple times: Power to coil and continuity of all connections and grounds, checked dizzy base plate ground, coil resistance, etc, etc, etc.
Set timing from scratch several times. Beer, gear (light) and ear.
Tried 2 new coils, new wires.
So, even though it is somewhat unlikely, given how little could go wrong with it, that the problem must be the pertronix unit. (I'm still researching some way I might test it.)
Obviously I can dig out a set of points (if I can find them) swap them in and try that. But I'd have to find them (and condenser and that plastic lead thing) and try and remember how to mount and set them ...
So while I mull my next step, any other insight?
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