2000 ACCORD, I replaced all coil packs after receiving codes P0300-P0305. Reset computer, car ran great for 2 days. now check engine light is back on and car is misfiring again. Confused...

 

What made you think it was the coil packs the first time? When does it misfire? Have you checked the plugs (are they gapped correctly)? Have you checked the EGR system?

 

It could be a sensor issue, if it's not the plugs or a wiring issue (ground or otherwise, just a guess).

 

does this have plug wires or coil on plugs?

does that code points you in a cylinder? or is that a random misfire?

if it points you to a cylinder, then just change the wire on that cylinder and the spark plug.

if that does not work,the your problem is in the injector on that cylinder which is rarely an issue

if you got a random misfire, then goodluck. hint a vacuum leak will affect this.

 

P0300- Random Misfire detected
P030#- Misfire detected on cylinder #

 

im beginning to think its a camshaft sensor isssue.

any other codes that we need to know about? bring in the scanner