Carbon buildup on the valves may illuminate the Check Engine Light, indicating "Multiple Cylinder Misfires." The combustion chamber must be cleaned of carbon. There are updated valve spring retainers that will help prevent a recurrence.Google+
Car Problem Reports
Chrysler 300 Check Engine Light Due to Carbon Buildup on Valves
Chrysler 300 Problem
Engines Affected: 3.5L V6, 5.7L V8 HEMI, V8
Average Mileage: 71,769 mi (29,000 mi - 160,000 mi)
Visitor, 2007 Chrysler 300, 3.5L V6, 87,000 mi
Problem code P1004 valve control and it's got the check engine light on
Visitor, 2005 Chrysler 300, 5.7L V8 HEMI, 29,000 mi
My check engine light comes on and I really think it is because of this symptoms of the Carbon build-up on the valaves. I have not fixed the problem yet.
Check engine light on and while driving all ligts on the dash come on .I had the knock sensor and EGR valve replaced but the problem is still there and the dealers cannot detect the cause.
Visitor, 2006 Chrysler 300, 3.5L V6, 50,000 mi
Engine light multiple codes
Visitor, 2005 Chrysler 300, 3.5L V6, 61,000 mi
misfire on cylinder 2
The car shuts down when I slow down to under 30 mph. No engine light comes on.This has happened 4 times in the last 5 months. Been in the shop and no-one can figure out why. Any suggestions?
Same problem over and over till the dealer used an old chemical that they say they are no longer suppose to use. Also started using better gas Sunoco 91. been OK so far
Visitor, 2006 Chrysler 300, 3.5L V6, 56,000 mi
Hi i'm having the same issue with my 2006 chrysler 300 3.5L, I've had it into the shop 4 times due to check engine light on and when i come to stop or get off a exit on the highway it will just die on me. then it starts up again, the last time in came on it was flashing and took it to the dealer they pulled the code which is p0300 which is a multiple misfire however they cant figure out which one is misfiring, they've reset the computer and flashed it due to the TSB on this vehicle and they have cleaned the fuel injectors and i'm still having the same issue. the dealer has had the vehicle for 1.5 weeks and still cant get the problem to duplicate. i'm confused... any advice for me as to whats going on what would cause this, please help me....