I just bought a 2002 accord ex v6 about a month ago, and the car drove great. Then about three days ago the check engine light came on, so I read the codes and got p0300 through p0306. So apparently all cylinders are misfiring.

The light only comes on when the car is idling; when I begin to drive the light turns off. The idle has quickly gotten rougher. I am going to switch gas to see if that is the problem, but beyond that I don't have any idea what the problem could be.

Any ideas? I don't have a ton of money to blow on diagnosis, and I would love to be able to fix it myself.

 

Do you know when the spark plugs were changed, or when they are due?

Your car takes NGK PZFR5F-11. Get only those spark plugs! They are platinum plugs and probably have a 90K mile lifetime. Those plugs are more expensive (about $12 a plug), because they last a lot longer than the copper ones my car takes.

Your owner's manual should tell you the mileage that they need to be changed.

The other possibility is that your EGR port is plugged up and causing the car to misfire on all of the cylinders. That should give you an error code for the EGR system.

 

I bought the car three weeks ago, and the previous owner changed the spark plugs three or four days before that. I don't know which type he got put in.

I haven't gotten an error code for the EGR. I always get P0300 and the manufacture code p1399, plus two or three cylinders at a time.

Any other suggestions?

 

So what ended up happening