EagleMark
09-30-2011, 04:12 AM
Many people do TBI conversions to other make vehicles and one of the ignition options is to use a Duraspark Stator also known as pick up module, magnetic pick up or? It's the electronic ignition that replaced the points. It sends proper signal to the GM EST module also nown as EST or ICM.
Today I worked on a TBI conversion done to a 302 Ford engine with this ignition. Origanally it was said to start and run fine but do to a lumpy cam they wanted me to tune it. Upon arrival I found it not to be running correctly, timing was not set properly nor would it? Reving the engine up would bring out the problem and while checking timing it was all over the place and when it started to miss and sputter the timing light would stop flashing. Leading up to a brand new stator that was faulty. Here is the test procedure from the Ford Manual. It has a part about vacuum advance which would be disabled for an EFI conversion.
To test the stator (also known as the magnetic pickup assembly), you will need an ohmmeter. Run the engine until it reaches operating temperature, then turn the ignition switch to the off position. Disconnect the wire harness from the distributor. Connect the ohmmeter between the orange and purple wires. Resistance should be 400-800-. Next, connect the ohmmeter between the black wire and a good ground on the engine. Operate the vacuum advance either by hand or with an external vacuum source. Resistance should be 0-. Finally, connect the ohmmeter between the orange wire and ground, and then purple wire and ground. Resistance should be over 70,000- in both cases. If any of your ohmmeter readings differ from the above specifications, then the stator is defective and must be replaced as a unit.
Today I worked on a TBI conversion done to a 302 Ford engine with this ignition. Origanally it was said to start and run fine but do to a lumpy cam they wanted me to tune it. Upon arrival I found it not to be running correctly, timing was not set properly nor would it? Reving the engine up would bring out the problem and while checking timing it was all over the place and when it started to miss and sputter the timing light would stop flashing. Leading up to a brand new stator that was faulty. Here is the test procedure from the Ford Manual. It has a part about vacuum advance which would be disabled for an EFI conversion.
To test the stator (also known as the magnetic pickup assembly), you will need an ohmmeter. Run the engine until it reaches operating temperature, then turn the ignition switch to the off position. Disconnect the wire harness from the distributor. Connect the ohmmeter between the orange and purple wires. Resistance should be 400-800-. Next, connect the ohmmeter between the black wire and a good ground on the engine. Operate the vacuum advance either by hand or with an external vacuum source. Resistance should be 0-. Finally, connect the ohmmeter between the orange wire and ground, and then purple wire and ground. Resistance should be over 70,000- in both cases. If any of your ohmmeter readings differ from the above specifications, then the stator is defective and must be replaced as a unit.