Mazda Millenia code PO300 FIXED
This 2000 Mazda Millenia had a rough idle and code PO300 stored in the ECM or computer. Being an ASE Master tech you would think this would be an easy one to repair. Right? No!!!This car made me wanna push my toolbox over a cliff and say “the hell with cars” “I’d rather be a greeter at Walmart” LOL. Anyway, All jokes aside….First, I removed a sparkplug for inspection. Plug was worn and looked original so I installed a new set of plugs and cleared the code. I took the vehicle on a test drive and the Check engine lamp popped right back on when the vehicle came to a stop. I cleared the code again and then noticed that a drive was not even necessary to trigger the lamp. The lamp would pop right back on at idle. I performed a brake torque test to see if the engine would stumble under load. No misfire at all nor did I notice a dead miss earlier when I drove the vehicle. I then checked the air intake hose for cracks, splits etc. No problem found! I then used a can of starter fluid to spray...