My 4JH3HTE normally revs happily up to its 3800 rpm
redline. Today, after a long lazy motor
at 1500 - 1700 rpm
(not in a hurry, enjoying the spectacular dead calm day, letting the tide do the work) from Yarmouth up to Cowes after the Old Gaffer Festival, and after nearly an hour idling while hovering around the Cowes fuel
barge waiting for a giant mobo to suck however many thousands of liters go into its tanks
, I decided to blow out the cobwebs, as I usually do, with a few minutes at full throttle.
Imagine my disappointment when I couldn't make more than 3300 rpm. After application of full throttle, revs would go up to 3500 or so, then quickly drop down to 3300 or even 3200. No black smoke, engine
perfectly smooth, just no revs
I had a similar incident a couple of years ago when got caught in a violent gale crossing the Channel at night. That case was much worse, however - revs down to 2300 or so IIRC. It turned out then that oil
got splashed into the intake from the violent motion of the boat (and possible overfilling of the engine), and gummed up the turbo. Problem quickly disappeared and I had several hundred hours of trouble free motoring afterwards.
Guys, what do you think?