2015 Buick Encore
Mileage
68,469
Service Date
10/30/2025
Services Performed
- FOUND: Concern verified, we found fault code P0300, Random misfire accompanied by shaking and lack of power when accelerating. We proceeded to review the live data while driving and observed that the fuel trims while idling versus while accelerating at 60 mph remained within specification (+10/-10). However, upon acceleration, the car quickly entered open loop. We suspected an ignition or compression failure. A relative compression test was performed and passed; the fluctuations indicated an engine with even compression in all cylinders. We proceeded with a coil-on-plug inspection to check the waveform and dwell time. We found many irregularities in the firing time in cylinders 1, 2, and 3. We removed the coil pack and found that it was broken in cylinders 1, 2, and 3; the plastic was broken, allowing the spark to escape. Ignition coil pack failed. Recommended R&R Ignition coil pack.
- Multi-Point Inspection
- All Fluids Checked and Topped up if possible
- IGNITION COIL – Remove & Replace
VALENTINE C. gave our service a 5 star review on 10/30/2025
