My car started bucking and the check engine light started flashing. I checked the code, it was P0301
What is your question?
This past Monday on my way to work, my car started bucking and the check engine light started flashing. I checked the code, it was P0301, Cylinder 1 misfire. Since then I have...
Changed the Ignition Coil Cylinder 1
Changed the Spark Plug Cylinder 1
Changed the Fuel Injector Cylinder 1
Performed a Compression test Cylinder 1. Passed 185 psi
Visually inspected the wire harness
Visually inspected the vacuum hoses
Swapped the ECU
About 2 months, ago I installed a new fuel pump, fuel filter and pressure regulator.
When I first start the car, it runs fine. While it is still in park, I can rev 'til the cows come home without issue. When I put the car in gear and drive for a few seconds, I get the Flashing CEL and Misfire code(p0301 only) comes back every time. Also, I can feel the car missing, so I know its not an erroneous code. What should I try next?
What makes this problem better or worse?
Better when the car first starts
How long has your 2009 Toyota Avalon had this problem?
RepairPal Certified shops can diagnose and repair your 2009 Toyota Avalon. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Misfire must be present at idle during time of testing - testing for proper ignition spark and fuel injector pulse should reveal culprit .. Engine running compression test may be helpful.
Otherwise seek *hands-on* help from 'qualified personnel' - with the necessary testing equipment.
Professional quality scanner can be used *during test drive* to view live misfire data - fuel trims and various related operations data.
