On a couple of occasions on our trip south I thought I heard a shrill noise from the engine area. Was not able to reproduce it when parked and running engine at 1500 rpms. The first thing I will look at is the tensioner but want to ask if anyone has experienced a similar noise and what were the causes. Looking at alternator? Ac compressor? If I remember the 2 times I thought I heard the noise it was using the engine break Jake. This is on an 05 Windsor with 04 ISL 400
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My 400ISL was doing the same thing.... broken exhaust manifold. This is fairly common on this engine. I had the diesel shop do the job because my Endeavor is a rear radiator and itís tough to get to the exhaust manifold...
Good luck with it.