Car Problem Reports

Chrysler Pacifica Check Engine Light Due to Carbon Buildup on Valves

Chrysler Pacifica Problem
23 Reports
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Model Years Affected: 2004, 2005, 2006, 2007

Engines Affected: 3.5L V6, 3.8L V6, 4.0L V6

Average Mileage: 124,180 mi (60,000 mi - 178,000 mi)


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.

  • Visitor, , 3.5L V6, 85,000 mi

    I bought this car used last year, shortly after getting it home from the dealer the check engine light came on. The code was p0304, misfire on cylinder 4. I took it back to the dealer who had it checked out several times. within the first 3 months of owning this vehicle it spent 2 months with the dealer..... the dealer gave up and said they cant fix the problem, I later did some reading and found out about the carbon buildup on the valvles that cause them to stick. The solution we have found for this is to use a good quality fuel injector cleaner and then switch to using gas from a manufacturer that includes cleaning agents in the gas, prefereably the premium grade. CHeck engine light has been off since then.

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  • Visitor, , 3.5L V6, 155,427 mi

    Engine light comes on and just got a tune up and oil change.

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  •  Rookie

    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

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  • Visitor, , 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.

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  • Visitor, , 3.5L V6

    misfire codes come up change all the coils and still get misfire and engine light blinking

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  • Visitor, , 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.

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  • GOLDENGODDESS, , 3.5L V6, 154,456 mi


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  • tonygday, , 3.5L V6, 157,000 mi

    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.

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  • sauerlemon, , 3.5L V6, 140,000 mi

    Still trying to get it fixed.

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  • Visitor, , 3.5L V6, 79,900 mi

    My motor light on

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