Re: '40 160 ignition mystery

Posted by HH56 On 2012/6/30 23:14:46

If you can disconnect the coil and ground just the coil terminal and get a spark than coil & plug wire is OK. If the points check out, then look at the ign cutout circuit.

There are 3 sets of contacts on the R9 ign circuit. One in the solenoid and two in the relay. If one is hanging, that could cause the problem.

IF OD is locked out, the single contact relay and the solenoid should be open. When OD is engaged and active, solenoid contact and single contact relay should be closed but the contact on double set relay will be open so all is normal. When kickdown is made, the contact on double set relay closes as it releases the solenoid. As solenoid drops out it's contact being closed grounds the ign and a few milliseconds later the single contact relay opens to restore ign until solenoid is fully released and that contact is open again.