Gator700

Thanks Sippi, I will look into this. Glad its working out for you.

Did you notice a mpg change? Other than the honeymoon period when you were trying it out,lol. Are you 6.2 or 5.3? I made the "mistake" of going to a 5.3 from my '14 6.2. Really notice the power difference. i put on 40-45k/year and mileage is a bit of a factor. Are you running 87 or higher?

So I finally took my truck back in. It was running better, but something was still off. The ticking sound was intermittent but fairly usual. It turns out that the broken valve spring also bent a pushrod. Waiting for parts out of Ontario.

Dont know the %, but i think it was one shade lighter than the back

Its been a few days now. After the first couple days of weird noise and crappy mileage, things seem to have cleared up. Perhaps it was the flapper valve on the exhaust sticking? Whatever the problem was it seems to have gone away and things are back to normal.

So, truck died on the highway. CEL flashing, traction control light on. Towed to dealer, broken valve spring #3 cyl. Tech notes say that #3 plug was fouled, switched it with #1, same missfire code, blah blah blah. Came down to broken exhaust valve spring. Got my truck back, mileage worse by 1.5-2l/100km(4mpg). Did a pass on the highway today and noticed a "fluttering"sound. Thought my rear door wasnt closed. Tried a couple different things and noise is intermittent and only happens under load at 3500-5000 rpm. Am i just being sensitive, or would there be valve/valve seat damage from the broken spring. Another spring that is on its way out? Anybody had similar issues? 6.2L w/100k

Switching from the winters to summers. 18"winters on front and stock 20"s on rear