![]() The challenge here is figuring out what's upsetting the fuel mixture or robbing the spark. Random misfires that jump from one cylinder to another may be caused by a lean fuel condition or a weak spark. Random misfires are another type of misfire that can be hard to nail down. That piece of knowledge may not tell you what is causing the misfire, but it should help you plot a diagnostic course in one of two directions. Intermittent misfires are often caused by a weak spark or a lean fuel mixture. The challenge is pinpointing the cause and correcting it. The underlying cause is still ignition, fuel or compression related. Fortunately, the supernatural has nothing to do with the problem. ![]() These are the ghosts that can drive you nuts. The hard-to-diagnose misfires are the ones that come and go and don't set any codes. The cause has to be one of three things: ignition, fuel or compression. You have a code, you know which cylinder is misbehaving, and you can hear and feel the misfire. Misfire diagnosis in this kind of situation should be fairly easy. ![]() There are no other codes and the engine has a steady miss. It's a code P0304 which tells you cylinder number four is misfiring. The Malfunction Indicator Lamp (MIL) is on and you've just found a misfire code.
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