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Name that I-5 noise!
My 87 4KCSQ seems to be warbling, I guess you could call it that. The noise is coming from the
front of the motor and seems loudest around just above idle. It is accompanied by a very slight
whistling sound. The noise really drops off above/below @ 1000 rpm.
I have VERY recently changed the following (although it made the noise before I did)
tensioner (idler) pulley
cam and crank seals
oil pump gasket
I followed the Bentley and torqued every thing to spec, the timing belt can be twisted 90
degrees per the manual etc....
It sounds to me like its coming from the water pump or the thermostat housing. Could it be air
in the cooling system? The car runs fine and does not overheat.