So I have had my Accord for a few years now and in the past few months there have been misfires in all six cylinders. I have changed the following:

Spark Plugs
Ignition Coils
EGR Valve

I don't know which to look at as the culprit next. The O2 Sensor, the fuel pump/filter or whatever else can cause it. Since it is all six I am guessing the mixture is off. Any advice is greatly appreciated!

 

it would be good maintenence to replace the upstream oxygen if it's never been replaced before but specifically what check engine codes are it throwing ?

 

P0301-6 for the misfires. There was one for the egr valve but it went away when I replaced it.

It's a blinking CEL

 

Verify and adjust the valves. They should be checked every 30K miles. Most likely the exhaust valves have tight/no clearance which will cause a loss of compression and a misfire.

 

mines been doing the same thing