300zx Idle

[fairladyzj]

My idle is gradually moving between about 800-900RPMs at a dead stop, is that normal?
She doesnt stall out or anything seems to run fine, just wondering about that idle shouldnt it sit at a fixed idle?

[evildky]

it's normal for idle to fluctuate by a small amount, but excessive fluctuation is usually due to a iacv or air regulator issues

[fairladyzj]

what would you consider excessive flucatuating? and would you say 800-900 rpm idle is bad?

by the air regulator im guessing the fuel pressure regulator?

[evildky]

no, the fuel pressure regulator si called...a fuel pressure regulator, the air regulator as you might have guessed regulates.....air the air regulator is on the back of the plenum the idle air hoses lead form the iacv to the air regulator then to the ballance tube

[evildky]

and I would considder a 100 rpm swing excessive