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Majority of the time I run 87 octane fuel and got carbon build-up in only one cylinder. Good to know the reason not use higher octane fuel if carbon build and engine performance issues is the end result. Thanks!

I have a 2007 Apex RTX at about 5800 to 6100 miles had similar issue this season. When the part failed it was the drive axel bearing on the clutch side of the track and speed sensor. I had yellow engine light, but never got the the code flashing until failure of the part that is why may not be...

I have 2007 Apex RTX around 6200 miles and had similar issues this season with loss of engine power and starting of engine & didn't sound right. It was carbon build around engine valves and resulting in loss of compression in my second cylinder. Once carbon was removed engine compression was...