Troubleshooting the PO305 Code A Comprehensive Guide to Cylinder 5 Misfire Resolution

A P0305 cylinder misfire can occur for a multitude of reasons, right from a faulty spark plug and fuel system errors to internal engine damage. Ran a tank of fuel system cleaner day 1. Issue: when accelerating onto the freeway Sunday it threw a p0305 code and began running rough at idle. A p0305 code came up, so naturally i assumed ignition coil, as the car shakes in idle while in drive, its an AUTO, and shakes in reverse. but doesnt shake at ... My first suspect was the battery. Whenever you get little glitches the battery is always the first suspect in my experience. A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #5. P0305 Code: The Secret Code Your Car is Trying to Tell You Is your car acting up? Don't ignore that pesky check engine light! I got the dreaded P0305 fifth cylinder misfire code. I replaced all three coil packs. I replaced all six spark plugs with Toyota OEM ... The CEL code was P0305, which corresponds to a cylinder 5 misfire. I checked the #5 spark plug (newly replaced) and wire (not original, not ... The sporadic issue comes with a few various possibilities.. the easiest being the injector is bad. The other not easy part is there is possibly valve leak. The engine error code is P0305 (cylinder 5 misfire). The dealer said they replaced the spark plug and coil, but no change, then a leak down test was performed ...