Checking exhaust valve clearance on Honda Civic using USB Autoscope

Car owner complained about a rough idle condition. A scan tool read diagnostic trouble codes P0300 Multiple cylinder/random misfire and P0304 Cylinder misfire. Pressure test Px was performed in cylinder Software analyzed the signal and displayed "The exhaust valve clearance is possibly too small" and as a consequence of that problem "Valve timing anomaly detected." The script gives this diagnosis in cases when the exhaust valve clearance is too small. Tools used: - USB Autoscope IV, an 8-channel scope: - px35 in cylinder pressure transducer -0.9…+35 Bar (-14 – 508 psi). How to connect the USB Autoscope and record the waveform is shown in this video: Find more information about cylinder pressure testing in this series of articles: For more information, please visit our website: