Quote:
Originally Posted by eatont9999
The only way I can think that it could be an internal problem is if there is a failure in the timing device. It would be a rare occurrence, though. It could change the timing enough to have problems starting and idling.
What does the exhaust smell like when it is running? If it is very rich, it could be retarded timing and that can make a turbo get too hot.
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Timing device failure: I agree that it could cause the described symptoms. I'm also suspicious of the abnormal noise reported on start-up. Timer with failed springs would, I imagine, make some bad noises. The only issue I see with that idea is that I don't think the failure would be gradual, I think it would be a sudden failure. Check the IP timing to test.
EGR valve failure? Feeding the exhaust directly back into the intake certainly will rob a lot of power (been there done that with an EGR valve failed in full open position). However, the power loss was accompanied by lots of smoke (unburned fuel).