Chrysler Pacifica Luxury meets versatility in this mid-sized sport utility vehicle

Engine Ticking 4.0L 2007

Old 01-27-2019, 03:30 PM
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Default Engine Ticking 4.0L 2007

Recently I've been hearing a tick coming from the 4.0L engine in my '07 Pacifica, 135k miles. The noise is most noticeable after a cold start, there is a slight tick / clatter that can be heard from outside the car.

Sometimes the noise will go away for a few days, but it will reappear eventually, typically after the engine has sat cold for awhile. Presently it's not terribly loud, but I want to take care of the problem before it becomes a bigger one.

Some web searching has turned up a possible rocker arm issue (related to some dowel pin shearing off) with the 3.5L and 4.0L engines and I'm wondering if that may be the cause. There is also a Chrysler TSB regarding the tips on the lash adjusters not being hardened and requiring replacement. Not sure which issue I have at hand here, but has anyone encountered this problem before and what was the solution?

How quickly does this problem get worse and does it cause engine damage if engine is run in this (ticking) condition? I have a trip to Arkansas planned next week and it's doubtful I have time to order new rocker arm assemblies and install them before I leave. Don't want to drive it if it has the potential to become a serious condition quickly.

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