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A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044
My check engine light came on Saturday while driving. I have a 2000 GMC Sonoma 4.3L. I stop at Advance Auto to have it check and the man said the #6 spark plug was misfiring.
He suggested that I change the spark plug; which I did the next day ! Then the check engine light came on again, and I had it check. This time it show my #3 spark plug is misfiring, and I'm not sure what to do now ?
Was there a reason for changing the spark plugs, was it giving you a misfire code? I have an 08 mazda 6 and I've changed the spark plugs before without any problems, if the engine is rattling and shaking it may be a misfire from a faulty plug or a bad coil pack atop the spark plug. You should be getting a Check engine light on the dash if so take it to a local Autozone or Advance Auto Parts, they'll check the code for free.
I doubt that your check engine light came on because of your spark plugs. I am not for 100% sure but unless your spark plugs are so bad that they produce no spark at all they aren't going to make your check engine light come on.
First I would unhook the negative cable from your battery for 15 minutes and then put it back on and see if that clears the check engine light. If it does great! But their still was a reason that your check engine light came on in the first place.
If you haven't had the plugs, wires, rotor and distributor cap changed in a while I would start with that. Those are the easiest things to change and should be change every 30-50 thousand miles anyways.
I'm not saying changing those parts will eliminate your check engine light but atleast you will know those items aren't the problem. Also you could change the fuel filter as well.
I'm not sure if your car is a v6 or not but I bet it is. If it is a v6 you will have 3 spark plugs on the left and 3 on the right side of your engine about have way down from the top of the engine.
Each sparkplug will have a thick black wire going to it. You can pull this wire off to get to the spark plug. The end of the wire will have a boot that sits on the top of the spark plug.
Then you will just use a deep well socket(In most cases) to unscrew the spark plugs.
If you know what the distributor looks like you can follow the 6 wires coming off it directly to each spark plug.
I hope this helps you get that check engine light off and good luck,
Feel free to post up your results and I will try to help you a little more because I'll bet your check engine light is due to a faulty sensor such as an oxygen sensor, throttle position sensor or something along those lines.
I would take the car to someone with a obd scanner and let them check which code made the check engine light come on and then you won't be just randomly changing parts. Which will save money. Most garages and even some parts stores have a scanner they can hook up and check codes for you. Yet again good luck!
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hello, on your subaru when you have changed your spark plubs the computer neded to be reset . disconet the positif cable from the batterie then turn the ignition key for 2 minutes then, turn the key off , replace the batt cable and start the engine the ck engine light should go off......nicolas........