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code p0302 refers to misfire detected cylinder 2===causes --engine mechanical fault--wiring---ignition/ fuel system---injector--ECT/MAF sensor---ECM
check the injector is working ok
Cylinder 2 Misfire Detected po302 . Evaporative Emission Control System po440 The last digit on a misfire code indicates the cylinder number. A code P0302, for example, would tell you cylinder #2 is misfiring. Chances are the misfire is due to a weak ignition coil. Did you change the pcv valve? Remember to put the o-ring on the new one or this problem will happen.
The most obvious cause for a #2 cylinder misfire would be either a bad spark plug or a broken wire. However you could also have a bad fuel injector or coil pack. I would suggest you check your spark plug and wire for that cylinder first because they are the easiest and cheapest to fix. If that does not solve the problem then start looking at the other options. I hope this helps you out.
I would check the fuel injector on number 2 cylinder. If the injecter is dirty or not functioning properly it may give you the symptom of an ignition misfire.
Number 4 cylinder is the 2nd cylinder back on the driver side. Check to see if your EGR valve is clogged with carbon. If it is, clean it out and I like to remove the EGR tube from the exhaust to valve and clean it out as well. The EGR tube is a metal tube. Remove the spark plug and see if it's been firing. How long has it been since it's had a set of plugs and wires?
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