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 Pacifica Check Engine Light Due to Carbon Buildup on Valves
Chrysler Pacifica Problem
Engines Affected: 3.5L V6, 3.8L V6
Average Mileage: 122,407 mi (60,000 mi - 178,000 mi)
my check engine light is on as well whn they get buildup like that would it cause my car to back fire and hard to start,put in a new fuel pump worked for 2 days and it stopped agian.or what would make my fuel pump burn out so quick
Visitor, 2006 Chrysler Pacifica, 3.5L V6, 155,427 mi
Engine light comes on and just got a tune up and oil change.
Visitor, 2004 Chrysler Pacifica, 3.5L V6
misfire codes come up change all the coils and still get misfire and engine light blinking
Visitor, 2006 Chrysler Pacifica, 3.5L V6, 65,000 mi
Engine Misfire, cylinder replacements, timing belt and water pump. $3900/ Called Chrysler they said not under warranty and cannot help with resolution.
CHECK ENGINE LIGHT COME ON...GOT IT TEST GIVE ME A CODE P0420
Visitor, 2005 Chrysler Pacifica, 3.5L V6, 60,000 mi
If I try to maintain a steady speed of between 35 and 45, the car just "stutters". Higher speeds and lower speeds seem ok. My mechanic has cleaned all the cylinders because of the "cylinder misfire" code. He puts some stuff in to clean valves and it's ok for a while then starts again.
Visitor, 2004 Chrysler Pacifica, 3.5L V6, 79,900 mi
My motor light on
Engine light comes on and usually stays on. the Last car I brought with this same problem, I wasn't able to Pass the emissions Test.