Re: NO SPARK!!!
**I have an 85 CJ-7 that I dropped a 401 into some time ago.
I had it running a while ago, and it suddenly died.**
Suddenly dying is a sign of a catastrophic failure of some sort.
(Last one of these catastrophic 'Ignition' problems I helped with, the guy had changed the coil, the module, the distributor trigger and starter solenoid and it still wouldn't run, so after I looked at it, he put on a fuel pump and it ran fine...)
First a couple of questions...
1. What ignition do you have?
If the distributor vacuum advance is made of plastic, and there is a square 4 wire connector plus a ground wire coming from the module, you have a Prestolite ignition.
If you have points, you probably have the Delco distributor. We can work with that.
If you have a metal vacuum advance, and no breaker points, you probably have the Motorcraft distributor.
This is a very easy to upgrade ignition.
Here are a couple of tests.
1. Take a spark plug, wrap stripped 14 Ga. wire around the threads.
Secure the other end of the 14 Ga. wire to a good ground, like the battery negative terminal.
Pull the coil wire out, and stick the top of the spark plug in the top of the coil.
Have someone crank the engine while you can watch the spark plug.
If you get spark, you have a problem with cap, rotor, coil wire, ect....
If you don't get spark at the test plug, you have a bad module, trigger coil in the distributor, or bad wiring in between...
**I even replaced the coil.**
That should rule out the coil, now check the module...
**The only time I have seen a spark is when the ignition is released to the "On" position from the "Start" position, there was a very small and brief spark.**
This is normal. That's exactly what it's supposed to do. The coil is saturating, and it's getting ground.
If you have an electronic ignition, try a new module...
Make sure you get a good one, like from Borg Warner...
Modules will still pass in store testing and still be junk, using a known good module is the only way to correctly test the system.
**Someone recommended that I change a "ignition switch" that's located under the dash "where the steering column meets".**
Don't listen to 'Parts Changers'...
Find the problem before you start changing parts.