| Page 24 - Index - Page 26 |
| Four Cylinder Engines
1978-1997
Four Cylinder Engines Using a Single Switch Box and Four Ignition Coils (continued)
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- Connect a DVA meter to the stator’s Blue wire and Blue/White wires and do a running test. The DVA voltage should jump up to well over 200V and stabilize. A drop in voltage right before the problem occurs indicates a bad stator. (Green/White to White/Green if the engine has a Red stator kit installed).
- Connect a DVA meter to the Red wire and Red/White wires and do a running test. The DVA voltage should show a smooth climb in voltage and remain high through the RPM range. A reading lower than what is on the Blue wires indicates a bad stator.
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High Speed Miss:
- Connect an inductive Tachometer to all cylinders and try to isolate the problem. A high variance in RPM on one cylinder indicates a problem usually in the switch box or ignition coil. Occasionally a trigger will cause this same problem. Check the trigger as described above under “No fire or Intermittent on One or More Cylinders”.
- Perform a high-speed shutdown and read the spark plugs. Check for water. A crack in the block can cause a high speed miss when the water pressure gets high, but a normal shutdown will mask the problem.
- Remove the flywheel and check the triggering and charge coil flywheel magnets for cracks or broken magnets.
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Four Cylinder Engines 1996-2000
Four Cylinder Engines Using a Combination Switch Box and Ignition Coil (CDM Modules)
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No fire at all:
- Disconnect the black/yellow kill wires from the harness and retest. If the engine’s ignition fires now, the kill circuit has a fault-possibly the keyswitch, harness or shift switch.
- Disconnect one CDM module at a time and see if the other modules start firing. If they do, the module you just unplugged is bad.
- Disconnect the yellow wires from the stator to the rectifier and retest. If the engine fires, replace the rectifier.
- Check the cranking RPM. A cranking speed less than 250-RPM will not allow the system to fire properly.
- Check the stator resistance and DVA output as given below:
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| |
Wire |
Read To |
Resistance |
DVA |
|
| |
White/Green |
Green/White |
500-700
|
180V or more |
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No fire or Intermittent on One or More Cylinders:
- If the cylinders are only acting up above an idle, connect an inductive RPM meter to all cylinders and try to isolate the problem cylinders.
- Using a set of piercing probes, check the trigger DVA output as given below:
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| |
Wire |
Read To |
Resistance |
DVA |
|
| |
Purple wire(#1)
White wire(#2)
Brown wire(#3)
White/Black wire(#4) |
Engine GND
Engine GND
Engine GND
Engine GND |
Open
Open
Open
Open |
3V or more
3V or more
3V or more
3V or more |
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NOTE: These triggers have the bias circuitry built into them, therefore you cannot measure the resistance like you
could the older engines. In addition, there are four triggering coils used.
- Disconnect one of the CDM modules that are firing at a time and see if the dead module start firing. If it does, the module you just unplugged is bad.
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High speed miss:
- Connect an inductive RPM meter to all cylinders and try to isolate the problem. A high variance in RPM on one cylinder indicates a problem usually in the switch box or ignition coil. Occasionally a trigger will cause this same problem. Check the trigger as described above under “No fire or Intermittent on One or More Cylinders”.
- Perform a high-speed shutdown and read the spark plugs. Check for water. A crack in the block can cause a high speed miss when the water pressure gets high, but a normal shutdown will mask the problem.
- Remove the flywheel and check the triggering and charge coil flywheel magnets for cracks or broken magnets.
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| Page 24 - Index - Page 26 |
