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Discussion Starter · #1 ·
I have a 2012 wrx sedan and I have had a little issue with misfires and I changed coils and ran two bottles of Techron Chevron complete fuel system cleaner, cleaned the MAF, changed to brand new NGK plugs and I checked the gap and it was all good. Any ideas?
 

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Check fuel pressure and post your fuel trims.

Is the car unmodified?
 

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Discussion Starter · #3 ·
My car has no mods at all and doesn't burn gas or oil. I changed the coils and put the fuel cleaner in it and it didnt throw a code for 1,000 miles and I hit about 1,500 miles today and I got up and started it in the garage and let it idle and warm up and when I sat back in the car after 5 minutes the CEL was on and i read the codes saying a misfire on all 4 cylinders but not a randomly misfire on all code.
 

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This is tricky without an adequate scan tool or engine management solution.

My first steps would be to check the fuel pressure then check for vacuum leaks. Professional shops can do both.
 

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Discussion Starter · #5 ·
Okay, I will look at where the intake goes on before the turbo for any cracking or leaking and go from there, thank you for the advice.
 
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