For a few years now our 2002 Subaru Forester 2.5L I4 has periodically (about 1-4 times per month) had problems starting. When we cold start the car, a loud noise comes from the engine and the car sometimes briefly shakes. The problem began a few years ago primarily during winter months (~32 deg F) with the car starting. Now the noise level and the shake are worse and the problem occurs during summer (80 deg F) with the car reluctantly starting some of the time. In either situation, the car starts normally once warmed up.
The Subaru dealer can't find the problem because it's so erratic; they've looked at it about 4-5 times. We've replaced the normal items (plugs, battery, PCV, air cleaner, X-msn fluid) and checked the starter bolts.
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