P0302, P0304 CEL codes

[Jay Fowler]

I've been getting CEL codes P0304 or sometimes both P0302 & P0304.
Since these are indicating cylinder misfires on the same (Driver's)
side of the engine, does this normally point to a suspect coil pack ?
When I clear the codes, they disappear for a week or less.

 

[xblazinlv]

I replied but for some reason it didn't show up

 

[xblazinlv]

A misfire can be caused by many things (ignition & fuel related), I
wouldn't necessarily assume that it is the coil packs just yet. See if
you can run a few tests and get to the bototm of the misfire. It will
be cheaper than trying to replace your components.

 

[etienne]

I've been getting CEL codes P0304 or sometimes both P0302 & P0304.
Since these are indicating cylinder misfires on the same (Driver's)
side of the engine, does this normally point to a suspect coil pack ?
When I clear the codes, they disappear for a week or less.

Check the plug wires first, especially if you have not changed them in
a long time.

Check http://www.endwrench.com for procedures on testing the cables and
the coil pack.

Etienne