Code P0303, engine misfiring?

Hi,

Is that the only code that is present? Can you feel the misfire? If you erase the code, does it come right back?

Let me know that. A misfire can be the result of several things. If you don't feel it or barely feel it, there may be an issue with low compression in cylinder three. Also, a poor connection at an injector or coil can cause it. That's why I was asking if the code returns.

Since you have already replaced everything for that specific cylinder, the next thing to check is if there is a compression issue.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-test-engine-compression

If you look below, I attached the directions specific to this vehicle. Additionally, the manufacturer's pressure specifications are indicated (highlighted).

Let me know what you find.

Joe

See pics below.

Hi,

If there is a leak at the intake, sure that can cause an issue. If you suspect there could be one, here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Low compression will cause a power loss. However, to what degree the loss will be experienced is based on how much of a loss there is.

Let me know.

Joe