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Re: PO300 multiple misfire detected it was saying # 3...
Do a compression check, there is a chance that you are down on compression on #3. Or make sure that your injector is firing on #3. Could have a bad wire going to the injector.
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code p0300 refers to--random/multiple cylinder/s misfire detected...Causes---spark plugs---HT leads---injectors---ignition coils ---low compression ---wiring code p0302 refers to cylinder 2 misfire detected Causes ---engine mechanical fault---wiring---ignition/fuel system ---ECT/MAF sensors ECM code po303 refers to cylinder 3 misfire detected Causes Engine mechanical fault---wiring---ignition/ fuel system ---injector---ECT/MAF sensor ECM The common fault to all is the fuel/system ignition I would have the injectors checked and have a pressure test done on the fuel manifold to check pump and fuel regulator valve.
P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open
When a misfire occurs, engine speed will fluctuate. If the engine speed
fluctuates enough to cause the crankshaft position (CKP) sensor (POS)
signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.
Causes: - Improper spark plug - Insufficient compression - Incorrect fuel pressure - The injector circuit is open or shorted - Fuel injectors may be faulty - Intake air leak - The ignition signal circuit is open or shorted
Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak
I have no idea what those last two are. Typo, maybe?
Your first two codes could be caused by old spark plugs and/or leaking plug wires.
Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.
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