Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to just answer. Which engine do you have in your 300?
Ok thanks. Did you replace the timing belt when you did the pump?
I see. Well it is possible that you are off a notch on one of the cams. Maybe the right cam. That could cause a p0300 code and not a cam out of sync code. Double check your valve timing again.
Did you ever loosen either one of the cam sprocket center bolts?
Valve carbon deposits can cause random misfires, and maybe a decarbon procedure would help, but it seems strange that the misfires happened right after the water pump replacement. The cam sprocket mark must be in between the two dots when setting up the timing.
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