Join Date: Jun 2007
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My '07, 6.7, has clattered at start-up on two different occasions. It was as loud as my old 96, 5.9. The first time it happened I shut it down, re-started, and it was back to normal, very quiet. The second time it happened, it was shut down, restarted, and it was still clattering. A check engine light did not come on.I was only a couple of miles from my dealer so I went there and the service manager had their diesel specialist come out to listen.(I left the engine running so they would be sure to hear the racket). The fellow told me he had the same experience with a truck they were preparing for delivery, shut it down, re-started and the noise went away. Anyway, an appointment was made to have it checked out. They didn't find anything wrong but they performed, what I was told, a government mandated flash that had to do with emissions.
My truck is back in the shop. They called to tell me it is ready and that they replaced a leaking EGR valve but found nothing else wrong. They also said that Chrysler told them the 6.7 has a break-in period of 6k to 8,000 miles before it will be "normal". The fuel mileage really stinks compared to my other two Dodge Cummins, a 96 and an '03. I tow a 12,000 pound fifth wheel. Just returned from a 600 mile round trip, averaging only 10.7mpg. My '03 averaged 13.5 on similar trips.