A&Q about 350Z
Q:
I'll bet it's your fan clutch..........
"YES I will finish what I sta"
.
1977 280Z blue 2+2,
1973 240z
1977 280Z coupe in restoration progress
A:
I'd hope its the fan clutch.. those are easy to replace.
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1985 300ZX n/a
A:
I sometimes get the same thing, but very briefly and in a certain rev range when the car is very cold (VFC). I'm guessing it's something like the fan clutch and not worrying about it.