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2003 Hyundai Tiburon 2.7L V6 P0300/P0301/P0303/P0305 Fault - Right Bank Cylinder Misfire with Supercharged Roots Blower Kit

Model: Hyundai Tiburon Fault Code: P0300 Posted: 2007-02-19 19:55

Hello, I'm looking for advice on diagnosing recurring misfire codes P0300, P0301, P0303, and P0305 on my 2003 Hyundai Tiburon 2.7L V6 with a supercharged Roots blower kit. The engine was tuned to 295whp at 9 lbs of boost and has only a few hours of runtime — mechanically sound. After a long drive, the Check Engine Light (CEL) activated, displaying P0300, P0-301, P0303, and P0305. These codes indicate misfires in the right bank of cylinders (Bank 2). I've already checked fuel pressure — it's within normal range — and confirmed that injectors are functioning properly. I'm also inspecting the intake gasket on the lower manifold for potential leaks on the right side. Possible causes I’m considering include: canister purge valve malfunction, Mass Airflow (MAF) sensor issues, or a faulty oxygen (O2) sensor on the right bank. Since this is an isolated cylinder misfire on one bank, how can I narrow down the root cause? Are there any specific diagnostic steps for identifying a single-bank issue in a V6 engine? Any insights or suggestions would be greatly appreciated. Thanks, T.C.

Related fault codes
P0300P0301P0303
Comments (3)
Anonymous 2007-02-20 09:53

What is the reading from the O2 sensor on the right bank of the engine? Is it showing erratic or inconsistent values?

Anonymous 2007-02-22 19:33

Hello, I checked the short-term fuel trims and noticed they're fluctuating significantly — Bank 1 shows around +28, then drops to -4, while Bank 2 shifts from about -2 to +18. The pattern repeats after a few seconds. Interestingly, I can reset the codes using an OBD2 scanner and restart the engine — but within seconds, the same misfire codes reappear. This behavior makes me suspect a camshaft position sensor issue. It's been very difficult to pinpoint, so any additional diagnostics or ideas would be helpful. Thanks, T.C.

Anonymous 2007-02-23 07:28

Does this engine have two separate camshaft sensors? If not, then a single-side misfire is unlikely due to one sensor failure — it may point toward a more localized issue like fuel delivery or ignition timing on that bank.