The issue you're describing with your Ducati Panigale V4 sounds like it could be related to several potential causes. Here are some possibilities to consider:
1. Quick Shifter (QS) Calibration or Malfunction:
- The quick shifter might be misaligned or not calibrated correctly, causing the bike to hesitate or fail to accelerate properly after an upshift.
- Check the quick shifter sensor and its wiring for any damage or misalignment.
- Ensure that the quick shifter is properly calibrated according to the manufacturer's specifications.
2. Throttle Position Sensor (TPS):
- A faulty or misaligned throttle position sensor could cause the bike to misinterpret throttle input, leading to a lack of acceleration after shifting.
- Check the TPS for proper operation and calibration.
3. Fuel Delivery Issues:
- There could be a problem with the fuel pump, fuel injectors, or fuel pressure regulator, causing a temporary loss of fuel delivery after a hard shift.
- Check the fuel system for any signs of malfunction, including fuel pressure and injector operation.
4. Ignition System:
- A problem with the ignition system, such as faulty spark plugs or ignition coils, could cause the engine to hesitate or fail to accelerate properly.
- Inspect the spark plugs and ignition coils for any signs of wear or damage.
5. ECU Mapping:
- The ECU mapping might not be optimized for the modifications you've made (e.g., exhaust valve delete). This could cause the engine to behave unpredictably under certain conditions.
- Consider having the ECU remapped or flashed with a tune that accounts for your modifications.
6. Wheel Speed Sensor (ABS Sensor):
- A faulty rear wheel speed sensor could cause the ECU to misinterpret the bike's speed, leading to issues with acceleration and shifting.
- Check the rear wheel speed sensor and its wiring for any damage or misalignment.
7. Clutch Slippage:
- Although less likely given your description, clutch slippage could cause a loss of acceleration after shifting. However, this would typically be more noticeable across all gears and not just during quick shifts.
- Inspect the clutch for any signs of wear or slippage.
8. Air Intake or Exhaust Restrictions:
- Any restrictions in the air intake or exhaust system could cause the engine to struggle under high load conditions.
- Ensure that the air filter is clean and that there are no obstructions in the exhaust system.
9. Software Glitch:
- There could be a software glitch in the ECU that is causing the issue. In some cases, a software update from Ducati might resolve the problem.
- Check with a Ducati dealer to see if there are any available software updates for your bike.
10. Diagnostic Scan:
- Since you mentioned using a universal diagnostic device, consider using a Ducati-specific diagnostic tool to get more detailed information about the bike's systems. Sometimes, universal tools might not pick up on manufacturer-specific error codes.
Next Steps:
- Inspect and Test: Start by inspecting the quick shifter, throttle position sensor, and wheel speed sensor. Test these components to ensure they are functioning correctly.
- Check Fuel System: Verify that the fuel system is delivering the correct pressure and that the injectors are working properly.
- ECU Mapping: Consider having the ECU remapped to account for your modifications.
- Professional Diagnosis: If the issue persists, it might be worth taking the bike to a Ducati dealer or a specialist who has experience with the Panigale V4. They can perform a more thorough diagnosis and potentially identify any issues that aren't immediately apparent.
Given the complexity of modern motorcycles, especially high-performance models like the Panigale V4, it's often best to consult with a professional if you're unable to pinpoint the issue yourself.
