A little background:
Car was running fine, no issues, no engine lights or codes. I did some preventive maintenance including timing belt, water pump (Oh what fun THAT was!), Crank position sensor, cam position sensor, coolant temp sensor, and spark plugs. Car ran fine afterwards for a couple weeks around town and then week 3 when on the highway for about an hour the MIL light came on. Code was 0300 - random misfires. Car didn’t actually seem to misfire as it didn’t*****, sputter, kick, backfire, or anything else you’d expect with an obvious misfire. Went ahead and then replaced the plug wires and ignition coil and checked the already new plugs for anything obvious…all seemed well. Reset the code and car ran fine with no codes for a few days around town again and then when on the highway again for about another hour, MIL light came back on. Codes read 0300 and 0302,0303 for cylinder misfires. Again, no obvious signs of an actual misfire as car never acted up or ran funny. It has always ran fine before and during this issue.
Question is this:
Does the vehicle need to have a cam/crank relearn procedure initialized or does the PCM just adjust itself as time goes on? Or, is there something else I may have done or didn’t do that could be causing the random misfire codes? I’ve heard it both ways that yes it needs a relearn and no, it doesn’t because this PCM doesn’t even allow for it as it just adjusts itself anyway. I’d like some real advice from someone in the know before I go out and buy a new scan tool that has the relearn capability. I’m a handy guy but all I’ve got now is just a reader, and I don’t mind getting a new one with more capabilities, but just really need some good advice first.
have the same problem?
Thursday, February 3rd, 2011 AT 10:12 PM