HEI and ELECTRONIC SPARK CONTROL FUNDAMENTALS AND TROUBLESHOOTING
Troubleshooting the HEI remote coil ignition w/o Hall effect
The HEI system, using the remote coil was used starting around 1987 and used up to around the mid 1990's. This system uses the same basic electrical troubleshooting procedures as the coil in cap system, so use that page as a reference and guide for troubleshooting and repair. The difference is that the coil is mounted remotely and there is some slight difference in identifying the connections and terminals.
Troubleshooting Ignition Coil 4 pin 2 connector type
The basic test for the coil is in the illustration below. Use a DVOM for testing, calibrate meter scale (some do automatically) to read zero when the leads are touching each other. Do this before testing coil to insure greatest accuracy. If meter will not calibrate to read less than 0.2 ohms, check leads or replace battery.
Troubleshooting Ignition Coil 3 pin single connector type
Test 1: With ohmmeter set on highest scale, touch one probe to the 12V power pin and the other probe to the coil case. The reading should not be anything less than infinity. Any reading is a cause to reject the coil.
Test 2: With the ohmmeter set on the lowest scale, reading should be around 0.35 to 1.5 ohms. Anything outside this range, replace coil.
Troubleshooting the Hall effect switch
There are two styles of Hall effect switches used, but the procedures are the same for both.
4 cylinder Hall effect switch testing. NOTE: Check polarity connections carefully before making any connections.
1) Connect a 12V power supply as shown, noting proper polarity before connecting. Hook up voltmeter as well.
2) Insert a small metal blade between the notches of the switch (see second picture) and note voltmeter reading. With voltage should be with 0.5V of battery voltage. If the reading is higher, switch is faulty and must be replaced.
3) Remove blade from switch and note reading on meter. It should read less than 0.5V. If it reads a higher reading, switch is faulty and must be replaced.
V6 and V8 Hall effect switch in distributor. NOTE: Check polarity connections carefully before making any connections.
Page 1: HEI-EST basic Fundamentals
Page 2: Troubleshooting basics for the HEI-EST system (coil in cap)