no spark, coils and ignition control module under coils ckecks good

1 ANSWERS

1. Guest458
   

   If the car has been running, then stopped suddenly (BEFORE YOU DISCONNECT THE NEGATIVE BATTERY CABLE) check the ECM for any error codes with an OBD-II tester.
   
   Possible causes:
   
   Bad camshaft or crankshaft sensor or both.  
   Both are located on the backside of the 2.0L near the firewall and below the power steering pump.  The crankshaft sensor is just above the upper lip of the oil pan near the belt side of the engine.   The camshaft sensor is usually above it. Access from underneath the vehicle.  Be sure to disconnect the negative terminal from the battery before disconnecting each of these components.
   
   You've stated that the Ignition Control module is good, however the two coil packs that are attached to it may be bad.  Do you have NO spark at all on any of the plugs -- OR -- do you have spark on just 2 cylinders?  If this is the case, then follow the spark plug wires back to the coil packs to see where they connect. If two cylinders have fire, then only one coil pack is bad.  You may even have bad sparkplug wires, but this is doubtful.
   
   The firing order for the 2.0 is 1-3-4-2.  When facing the engine from the front of the car, the cylinder numbers are 1-2-3-4 from left to right.  On the back of the engine, the coil packs for this engine are attached independently on top of the ignition module.  The pack on the left from top to bottom is for cylinders 1 & 4.  The coil pack on the right is for cylinder 3 & 2 (from top to bottom).
   
   If the car has been running, then stopped suddenly (BEFORE YOU DISCONNECT THE NEGATIVE BATTERY CABLE) check the ECM for any error codes with an OBD-II tester.
   
   If your Cavalier has anti theft, then sometimes the ignition switch on the steering column can go bad, causing the anti theft system to activate.  Turn the key on with the doors shut and locked.  If the THEFT light is flashing, then turn the key on (without starting the engine) and wait about 10 minutes. The THEFT light should go off. When it does, turn the key off and repeat this procedure TWO MORE TIMES.  After this, the engine might start as you will now have fire to all the spark plugs.
   
   Worst case scenario:  BAD ECM.  
   
   In this case, you will need to remove the ECM and purchase a new one.  When you have the new one, you will need to have it "flashed" at an auto parts store (about $70-$80).  You will need to provide the vehicle VIN number to have the ECM flashed.

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