Cylinder misfire and engine misfire, how do I fix this?

Hi,

If the new plugs and coil packs didn't help, it could be a couple of things. For example, there could be a fuel injector issue. Also, with that many miles, it could be a head gasket or simply low compression in those cylinders.

I suspect you had P0305 and P0306 codes. Were there any other codes?

Also, since cylinders 5 and 6 are next to each other, the first thing I would be checking is for engine compression in those cylinders. A faulty head gasket can leak between the two. See pic below for cylinder orientation.

Here is a link that explains how to check compression. You will need a compression gauge, but most parts stores will lend one to you.

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

Let me know if that is something you are comfortable performing.

Take care,

Joe

See pic below.

Hi:

If the new plugs and coil packs didn't help, it could be a couple of things. For example, there could be a fuel injector issue. Also, with that many miles, it could be a head gasket or simply low compression in those cylinders.

I suspect you had P0305 and P0306 codes. Were there any other codes?

Also, since cylinders 5 and 6 are next to each other, the first thing I would be checking is for engine compression in those cylinders. A faulty head gasket can leak between the two. See pic below for cylinder orientation.

Here is a link that explains how to check compression. You will need a compression gauge, but most parts stores will lend one to you.

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

Let me know if that is something you are comfortable performing.

Take care,

Joe

See pic below