P0305 Code A Troubleshooting and Repair Guide for Optimal Ignition System Performance

If the coil pack on cylinder 5 started to malfunction then even swapping the coils around could still give the same trouble code because ... Could also be a problem with the cylinder #5 fuel injector, valve adjustment or compression issue. 1994 ... The CEL code was P0305, which corresponds to a cylinder 5 misfire. I checked the #5 spark plug (newly replaced) and wire (not original, not ... That the plug is bad may be a guess because I'm not sure how the differentiate plug/coil issue without seeing the plugs after removing them to ... P0305 indicates that cylinder #5 is misfiring due to a loss of compression. The code indicates a cylinder problem, not an injector problem. The reason I ask is because I had a similar issue P0303 code that would come and go for about a year. The truck ran fine but the stupid light ... The check engine light has been going off the past few months giving the code P0305, cylinder #5 misfire. I replaced all 6 plugs and coil packs as well as the ... Ok, so after I replaced the #5 coil and still got P0305 codes and misfires under load... I ran through the remaining gas in the tank (octane 87) ... ... code (?) Saying multiple cylinder misfire. THAT got me thinking. If I haven't thrown a code, how can they read one when the lights not on ... The following may correct an emission control system malfunction: If one or more of these conditions occurs, change the fuel brand used. It may ...