So I have replaced the coil the distributor cap,points condencer and rotor and voltage regulator. I am still not getting any spark. Any suggestions would be helpful. Thanks Darren.
Darren,
Welcome to the forum.
First verify that you are getting power to the coil + terminal with the ignition key on, you should have 9 to 10 Volts. Next verify that you are getting power to the coil + terminal when the starter is turning over the engine ( this should read 12 Volts).
Next test the coil’s primary and secondary resistance. Test the coil’s primary resistance by placing an ohmeter lead on the coil + side and the other lead on the coil negative terminal. The reading should be very low ( on my stock coil, it reads 1.4 ohms).
Next test the secondary winding resistance. First remove the coil high tension wire from the distributor and place the ohmeter leads on the positive terminal of the coil and the other lead to the other end of the high tension wire. On my stock coil, I read 11K ohms. Next remove the high tension wire and measure the resistance of the wire itself. On my car, the wire read 4K ohms. Thus my secondary winding has 7K ohms resistance.
If the primary resistance and the secondary resistances are within tolerances, then check your distributor as follows. Remove the distributor cap and turn the engine until the points are closed. Place the ohm meter probes on the negative coil post and the other ohm meter probe to the distributor body. The resistance should be very low here indicating a good electrical path. I measured 12 ohms
Now rotate the engine so that the points are open. (BTW, when fully opened the stock points should be at 0.017 to 0.019 inches.) With the ohm meter probe again on the negative post and the other probe on the fixed side of the points should have very low resistance, however placing the probe on the movable portion of the points should have infinite resistance. If there is little resistance between the negative side of the coil and the movable side of the points. place the probe on the distributor body and measure its resistance. If this shows a low resistance, then there is a grounding issue within the distributor.
Let me know if you need any additional information.
Coach Jack
Is this an XR-7? If so you tach has probably failed. The power to the coil / points passes through the tach. When it fails the result is no start, or the engine will try to start and then die when you turn the key to the run position from the start position.
Thank you we got er running it was the ground inside the distributor.
You know, I love the fact that people in this community actually help each other.
On the S10 forum I’m on you have to pull teeth for someone to give any advice.