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Id be interested in how he tested. My 13 has almost 125k miles and Ive had one misfire from a coil pack failure and one due to a partially plugged injector. All injector tests came back good but replacing it fixed the issue. Is it a P0300 or 301,302,303,304? At least gives you a spot to focus...

Problem solved. Injector 3 looked nearly completely plugged upon removal. Replaced it and car runs like a top. Definitely some carbon build up in the intake runners and the head but not terrible, and a couple of pieces of buildup on the intake valves as well. Probably look into sea foam or...

Yes, coil pack and plug replaced, then swapped with working cylinder- no dice. After the swap I moved the coil pack back to where it was. I pulled the #3 spark plug and checked the gap with feelers- just a bit over 0.040 inches (which I believe is in spec for the PE5R-18110s I have installed). I...

Another piece of potentially relevant information- when warm, the fuel trims at low loads (STFT+LTFT) are power than at high loads. Typical low load will be about 7%, whereas high load varies between 10.5-12.5%. Note that its high load- pretty much doesnt care about RPM, its more related to the...

Ill start at the end- the 150k warranty covers PZEV vehicles sold in certain states, and includes all emissions affected system including injectors, PCM, coils, etc. with the exception of spark plugs. If you check your warranty booklet with the cars manual, it should be in there. The coil pack...

Problem not solved yet, but boy do I have a good story to go along with this. I began looking for ways to troubleshoot since its intermittent and noticed that my computer and a number of other things specified California. Then, i saw the emissions warranty and since I had parts specified...

Updates thus far- ran a couple bottles of injector cleaner- no dice. Got a better code reader that will output graphs and stuff and thought I saw something in the MAF, so I cleaned it and no change. Have a new MAF coming but I dont think thats it. The code reader shows how many misfires on each...

13 GT Cold and Low RPM Misfire I bought my 13GT about 2 years ago and have a long highway commute so its at about 122k miles now. With about 60k on it, one of the coils failed completely- replaced it and all four plugs and no more issues. At about 115k, I started noticing an inconsistent shake...

While it sounds like youre going the right direction, another cheap thing to check that caused a similar issue for me is the brake pedal switch. I replaced mine and good as new.