It's probably due to carbon buildup which, in turn, caused the valve to no longer seat properly and allowed hot exhaust (most likely exhaust valve) gasses passed the valve and voila, rough idle, misfire, etc.What does a burnt valve mean ? Do you mean a bent valve or do you mean the blunt end was actually burned through and was leaking ?
Well I think the Walnt Blast may clear up some of the mis-firing but I am still in LIMP mode....I don't think this carbon cleaning is going to solve this ....... Need the RossTech diagosticsIt's probably due to carbon buildup which, in turn, caused ther valve to no longer seat properly and allowed hot exhaust (most likely exhaust valve) gasses passed the valve and voila, rough idle, misfire, etc.
Hey thanks for the reply and I just got done today with the carbon cleaning and just as I suspected the car remained in limp mode. I still have misfires on Cylinders 2, 3, 4 but not one so I could take injector one put it on any of the others and determine if the injectors are failing. If the injectors are not the problem then I am back at square one and my next guess would have to be the timing.Hi, sorry you're dealing with this one. I have been right there. When the carbon build up gets that bad, it will definitely affect the injectors. I know because after I have the valves cleaned, I was still in limp mode too. They are not impervious to wear or damage, and they cost a lot too. However, once I did that, all was back to normal. At 188k and still rolling. I would also recommend having the car scanned to really have a better heads up on the situation.
As far as a service recommendation in SD, Pure Motorsports would be the call. They will scan the car for free and give you the scenario.