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Did you replace the IGNITION coil or the "PULSING coil"? There are two different types on that engine. The ignition coil makes the high-voltage spark, the pulsing coil is a sensor that tells the ignition control module when to tell the ignition coil to make that spark. The pulsing coil is pretty inexpensive on eBay.
If you change both the ignition coil and the pulsing coil and the problem still persists, you may need to replace the ignition control module.
Unfortunately, they don't make these things simple any more, or easy to troubleshoot.
3.7L Engines Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to gain access to each spark plug. Refer to Ignition Coil Removal/Installation. Prior to removing spark plug, spray compressed air around base of ignition coil at cylinder head. This will help prevent foreign material from entering combustion chamber.
Remove spark plug from cylinder head using a quality socket with a rubber or foam insert.
Inspect spark plug condition.
Start the spark plug into the cylinder head by hand to avoid cross threading.
Before installing coil(s), check condition of coil o-ring and replace as necessary. To aid in coil installation, apply silicone to coil o-ring.
Tighten spark plugs to 27 Nm (20 ft. lbs.) torque.
Install ignition coil(s). Refer to Ignition Coil Removal/Installation.
Remove the upper and side fairings, using a 4 mm Allen wrench to unscrew the fairing bolts. Unlock and remove the rider's seat, using the ignition key. 2
Pull the fuel lines off of the fuel valve under the left side of the fuel tank. Unscrew the pair of bolts from the base of the fuel tank, using a 10 mm socket. Pull the fuel tank to the rear of the motorcycle to remove it..
Pull the cables off of the two spark plugs on the right side of the motor. The spark plug cable furthest to the right is connected to the right ignition coil, while the second cable is connected to the left ignition coil. Unscrew the spark plugs from the motor, using a spark plug socket. Plug the ignition cables back onto the removed spark plugs. 4
Hold the spark plugs against the motor and start the motorcycle for a few seconds. Observe the gap between the electrode at the tip of both spark plugs for spark. Ideally, the spark should have a bright, blue appearance. 5
Replace the spark plugs with new DR8E spark plugs, if no spark is present. Repeat the test. Replace the corresponding ignition coil if there is still no spark present at the spark plugs' electrodes. 6
Proceed to Section 2 for further diagnosis, or reassemble the motorcycle following the reverse method of removal. Testing the Windings 7
Remove the suspect ignition coil from the motorcycle's frame, using a 10 mm socket. Unplug the coil's cables from the remaining spark plug in the motor and from the spark plug removed in Section 1. Unplug the motorcycle's wiring harness connector from the back of the ignition coil. Remove the remaining ignition coil, if needed, using the same procedure. 8
Set your multimeter to read an R X 1 resistance range, using the meter's settings dial. 9
Measure the ignition coil's primary winding at the terminal that connects to the motorcycle's wiring harness, using your multimeter. Touch the meter's red probe to the coil's positive (+) terminal and the black probe to the coil's negative (-) terminal. Take note of the measurement on the meter's display. Replace the ignition coil if its primary winding has a resistance measurement less than 3 ohms or greater than 5 ohms. 10
Set your multimeter to read an R X 1,000 resistance range, using the meter's settings dial. 11
Measure the ignition coil's spark plug cables, using your multimeter. Touch the meter's probes to the metal connectors within the cable's end caps. Take note of the resistance measurement on the meter's display, indicated in ohms. Replace the ignition coil if the cables have a resistance measurement less than 25,000 ohms or greater than 45,000 ohms. 12
Reinstall the ignition coil if its primary winding and spark plug cables are within the specified resistance range, using the reverse method of removal. Replace the entire ignition coil if either the primary winding or the spark plug cables are within specification, as the ignition coil and its cables are a combined assembly. 13
Reassemble the motorcycle following the reverse method of removal. Connect the left ignition coil's cables to the pair of spark plugs in the middle of the motor's cylinder (#2 and #3), while the right coil's cable connect to the spark plugs on the sides of the cylinder (#1 and #4).
Unplug the engine control sensor wiring connectors from the ignition coil and the radio ignition interference capacitor.
Tag and disconnect the spark plug wires from the coil by squeezing the locking tabs, then twist the tab and pull upwards.
Unfasten the four ignition coil retainers and remove the coil and the coil ground wire the radio ignition interference capacitor. Save the capacitor and coil ground wire for re-installation of the coil assembly.
Wipe the coil towers with a clean cloth dampened with soap and water. Remove any soap film and dry with compressed air. Inspect the coil for cracks, carbon tracking, dirt or damage and replace as necessary.
Hello . If you have a weak spark it could be the ignition coil that needs adjustment or a bad ignition coil . To find the ignition coil simply follow the spark plug wire . To readjust the coil get a piece of paper , loose the bolts on the coil and put the paper between the coil and the flywheel (higher part of the flywheel or magneto) tight the bolts and remove the paper .
Check for spark . If still a weak spark just replace the ignition coil .
Hope this help.