I've got a 99 Z28 auto and its making a strange ticking noise thats
from either the engine or the trans. This noise ONLY happens when the
in drive and is under power (ie not when its in drive and coasting or
its in neutral and engine is revved) and the speed of the ticking
falls in line with engine rpm. Someone has suggested it may be a bent
torque converter vane. Does anyone else have any ideas?
I had a problem like that on my '97 Z28 at about 60k miles. Same symptoms.
Turned out that it was the serpentine belt tensioner. The water pump was
leaking into it and after a while, the bearings must have been affected.
They were catching and releasing, causing that sound. No idea why it only
happened under load though. New pump and tensioner and the cars been fine
for the last 93k. No problems like it since.
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