Business ProfileforJoe Morgan Honda

On Dec. 29, 2023 a had an appointment with Joe Morgan Honda to have my valves adjusted [proactive routine maintenance] on my **** ***** *******. It was agreed that I pay $419.84 for the service. Prior to my service I had zero issues with my vehicle. Immediately following their service I noticed an irregular idle and a severe drop in mpg. I called them immediately to have them check their work. They got me in about a week later and assured me that "everything was within spec." Since that time the issue has not abated and I have lost trust in them to rectify the situation. I began doing research and pulled the numbers from the vehicles ECU and found that the MAP [Manifold Absolute Pressure] to be glaringly low. Normal atmospheric pressure is 29.9inHg. When an engine is running the intake reduces the pressure to [approximately] 20inHg. Information that I could find states that the Honda ******* should be between 18-22inHg. After their service, my MAP is consistently at 8-9inHg. This low reading is usually caused by is valves that are too tight. Which is what the vehicle was initially brought in for and paid to prevent. The service was clearly done incorrectly despite having multiple opportunities to remedy the situation. Attached are pictures of 8 readings confirming the Intake Manifold Absolute Pressure of my vehicle.