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Discussion Starter #1
My 2004 wrx miss fires badly at higher rpms and a buddy of mine told me i have a bad coil how do i check to see which one of the four it is if it is even one maybe multiple are bad. Is there any tricks to check im not a big electronics guy any help greatly appreciated thanks:)
Car is bone stock just changed plugs NGK irodiums and synthetic oil
 

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What CEL are you getting?

Since you've changed the plugs, check the wiring and coils for correct contact. If it's the coils it could just be an installation problem.
 

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Discussion Starter #3
there are no codes it had a code for 02 sensor about 4 months ago changed that no code since. bought the car about 6 months ago and it has had the missing problem since it will miss badly 95% of the time you try and take it above 4000 rpm has gone clean and pulled strong through out maybe 3 times since i bought it. i double checked all plug gaps and tightness off all coil packs and checked for any lose cut wires all clean
 

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If it is not throwing a code and there is no apparent fault at the coils, check the intake. Clean filter, check for vacuum or boost leaks. I assume the intake is stock and so is the BOV. Another thought is to see if the fuel delivery is OK. On an older car one might change the filter although it's a rare event to have one clog.
 

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On an older car one might change the filter although it's a rare event to have one clog.
Unless you are like my co-worker here. he hadn't changed his fuel filter in 150K miles. He said when he pulled it out it was dripping black gunk.

I think he will change it regularly from now on as he was getting lean codes from his ECU.
 

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Discussion Starter #6
yes both intake an bov are stock i will check fuel related thing after work... my buddy told me that the coil has to produce more power to the plug at higher rpms or something like that correct say mine is probably going bad and cannot perform that highly so it misses??? IDK i am willing to try anything at this point before im forced to take it to the dealer and give them my life savings to fix it:unhappy:
 

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Discussion Starter #7
wow:eek: no my car only had 39000 when i bought it now has 50000
 
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