I would venture a guess that you have a sticking fuel injector and cause is loosened carbon and sludge deposits. The change in fuel coincides with deposits being dislodged. Clicking noise would be caused by injector mechanism not moving smoothly (spring sticking, disc hanging up, etc.). Since the injector is not operating correctly, the cylinder is misfiring, cause rough running and loss of power. Switching back to previous fuel type may help, but at least one injector needs attention. You should be able to locate clicking injector using a mechanic's stethoscope or by placing a long screwdriver onto injector body, then putting your ear against the screwdriver handle. Factory manual procedure is to isolate misfiring cylinder by slightly loosening fuel delivery line at injector body, with engine running. A good injector will cause engine to stumble and run roughly when line is loosened. After loosening and confirming injector condition, tighten the fitting snugly, then move on to next injector. Test each one by one until faulty unit is located. Injectors can be rebuilt, but it is not for the novice. Better option is to buy rebuilt injectors and replace any which are suspect. FYI: unburned fuel due to misfiring will dilute oil and wash down cylinder wall leading to accelerated wear. Attend to this problem promptly to avoid premature damage.
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I would venture a guess that you have a sticking fuel injector and cause is loosened carbon and sludge deposits. The change in fuel coincides with deposits being dislodged. Clicking noise would be caused by injector mechanism not moving smoothly (spring sticking, disc hanging up, etc.). Since the injector is not operating correctly, the cylinder is misfiring, causing rough running and loss of power. Switching back to previous fuel type may help, but at least one injector needs attention. You should be able to locate clicking injector using a mechanic's stethoscope or by placing a long screwdriver onto injector body, then putting your ear against the screwdriver handle. Factory manual procedure is to isolate misfiring cylinder by slightly loosening fuel delivery line at injector body, with engine running. A good injector will cause engine to stumble and run roughly when line is loosened. After loosening and confirming injector condition, tighten the fitting snugly, then move on to next injector. Test each one by one until faulty unit is located. Injectors can be rebuilt, but it is not for the novice. Better option is to buy rebuilt injectors and replace any which are suspect. FYI: unburned fuel due to misfiring will dilute oil and wash down cylinder wall leading to accelerated wear. Attend to this problem promptly to avoid premature damage.
I would venture a guess that you have a sticking fuel injector and cause is loosened carbon and sludge deposits. The change in fuel coincides with deposits being dislodged. Clicking noise would be caused by injector mechanism not moving smoothly (spring sticking, disc hanging up, etc.). Since the injector is not operating correctly, the cylinder is misfiring, cause rough running and loss of power. Switching back to previous fuel type may help, but at least one injector needs attention. You should be able to locate clicking injector using a mechanic's stethoscope or by placing a long screwdriver onto injector body, then putting your ear against the screwdriver handle. Factory manual procedure is to isolate misfiring cylinder by slightly loosening fuel delivery line at injector body, with engine running. A good injector will cause engine to stumble and run roughly when line is loosened. After loosening and confirming injector condition, tighten the fitting snugly, then move on to next injector. Test each one by one until faulty unit is located. Injectors can be rebuilt, but it is not for the novice. Better option is to buy rebuilt injectors and replace any which are suspect. FYI: unburned fuel due to misfiring will dilute oil and wash down cylinder wall leading to accelerated wear. Attend to this problem promptly to avoid premature damage.