1993 3.0 Ranger
1993 3.0 Ranger
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Joined: Feb 2017
Posts: 24
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From: Newnan GA
Part 5 -How to Test the Coil Pack (Ford 3.0L, 3.8L, 4.0L, 4.2L)
go to this web site for diagram. probe for 12v at wire four first. If you dont have voltage you have a bad fuse or relay.
Number 1: Switching Signal Circuit for Cylinders 3 and 4.
Number 2: Switching Signal Circuit for Cylinders 2 and 6.
Number 3: Switching Signal Circuit for Cylinders 1 and 5.
Number 4: Power Circuit (12 V) for all of the Ign. Coils within the coil pack.
go to this web site for diagram. probe for 12v at wire four first. If you dont have voltage you have a bad fuse or relay.
Number 1: Switching Signal Circuit for Cylinders 3 and 4.
Number 2: Switching Signal Circuit for Cylinders 2 and 6.
Number 3: Switching Signal Circuit for Cylinders 1 and 5.
Number 4: Power Circuit (12 V) for all of the Ign. Coils within the coil pack.
1993 3.0l uses a distributor not coil pack
Welcome to the forum
You have a TFI spark system on a 1993 Ranger with 3.0l engine
The TFI module is what makes the coil spark.
Inside the distributor is a Hall Effect Sensor, it replaced the "points" on the older systems but serves the same purpose, it reads markers on distributor shaft and TFI sparks the coil at each marker.
First,......... is your distributor shaft turning?
Many people don't look, lol, so make sure Rotor and shaft are turning when cranking the engine.
Distributor gear can come loose, and if shaft isn't turning then no spark
If shaft is turning then turn on the key and check for 12volts at the coil, coil should have 12volts on "+" terminal when key is on.
Now check for 12volts at that terminal when engine is cranking, on some systems the 12volts is sent on a different wire when key is in START position, in 1993 it should have the 12volts all the time but costs nothing to check it.
To get a coil to spark the GROUND "-" terminal is used.
So all you need to do to test a coil, any coil, is to give it 12volts then a ground, remove the ground and coil will spark.
The Ground powers up the coil's Primary side, removing the ground causes it to spark from Secondary side.
The TFI module is Grounding and unGrounding the coil when the Hall Effect Sensor tells it to, so that's what causes the spark.
TFI troubleshooting guide here: Ford EEC-IV/TFI-IV Electronic Engine Control Troubleshooting
Because of the age of the system it is most likely a wiring issue between hall sensor, TFI module and coil, could be bad TFI module, many auto parts stores can test TFI modules
The computer(EEC) assists TFI module with spark advance and retard, but TFI module doesn't NEED computer to start or run the spark, if engine was running but sluggishly then it could be computer or computer wiring issue.
Welcome to the forum
You have a TFI spark system on a 1993 Ranger with 3.0l engine
The TFI module is what makes the coil spark.
Inside the distributor is a Hall Effect Sensor, it replaced the "points" on the older systems but serves the same purpose, it reads markers on distributor shaft and TFI sparks the coil at each marker.
First,......... is your distributor shaft turning?
Many people don't look, lol, so make sure Rotor and shaft are turning when cranking the engine.
Distributor gear can come loose, and if shaft isn't turning then no spark
If shaft is turning then turn on the key and check for 12volts at the coil, coil should have 12volts on "+" terminal when key is on.
Now check for 12volts at that terminal when engine is cranking, on some systems the 12volts is sent on a different wire when key is in START position, in 1993 it should have the 12volts all the time but costs nothing to check it.
To get a coil to spark the GROUND "-" terminal is used.
So all you need to do to test a coil, any coil, is to give it 12volts then a ground, remove the ground and coil will spark.
The Ground powers up the coil's Primary side, removing the ground causes it to spark from Secondary side.
The TFI module is Grounding and unGrounding the coil when the Hall Effect Sensor tells it to, so that's what causes the spark.
TFI troubleshooting guide here: Ford EEC-IV/TFI-IV Electronic Engine Control Troubleshooting
Because of the age of the system it is most likely a wiring issue between hall sensor, TFI module and coil, could be bad TFI module, many auto parts stores can test TFI modules
The computer(EEC) assists TFI module with spark advance and retard, but TFI module doesn't NEED computer to start or run the spark, if engine was running but sluggishly then it could be computer or computer wiring issue.
Last edited by RonD; Feb 23, 2017 at 12:27 PM.
No spark so no need for oil pressure, lol
On distributorless engines its a different story, Cam sensor often drives oil pump and engine runs just fine if cam sensor gear fails, and that can be bad news
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