P0300 Code The Ultimate Guide to Diagnose and Repair Engine Issues

The CEL should illuminate when the key is turned ON before the engine is started. That's a check to be sure the light still works. The engine light has come on, but goes off after a few starts or running time. It comes on when truck is idling or street driving---niot while on the highway ... The 5/6 are specific cylinder misfires, but the P0300 random misfire had me stumped. I figured it was probably my coils, since my plugs were changed about 30k ... The manual say it could be one of the following: fault - spark plug coil wire vacuum leak injector fault low/high fuel pressure A lot of possibilities. P0300 Code "Cylinder misfire" · P0300 Code "Cylinder misfire" · Who is online. Users browsing this forum: scot850 and 0 guests. There's basically 3 reasons why a cylinder misfires; 1. Loss of spark(which you've addressed) 2. Air/fuel mixture too unbalanced to ignite 3. Loss of ... A P0300 trouble code means that one or more cylinders is misfiring and not completely burning its fuel/air mixture. Bearing in mind that you ... P0300 - Random/Multiple Cylinder Misfire Detected · Navbar Menu · P0300 - Random/Multiple Cylinder Misfire Detected · Footer. After an intermittent engine light (every 3-4 weeks) and reading a P0300 Random misfire / multiple cylinders and also a occasional rough idle, I tuned it up. I am working on my daughters 2003 ZR2 with around 150k miles.I am dealing with the Dreaded P0300 code. I have the flashing service engine light, car runs OK.