240SX simple idle adjustment

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Crunchy Cookie - 26 Dec 2004 22:43 GMT

Back on my old 95 200SX SE-R, my mechanic said there was a little screw you
could just turn one way or another to adjust your idle speed. Is there
something like that on my 240SX? I seem to be idling at about 600-700, where it
vibrates too much. I'd rather have 800, which feels smoother and I assume is
normal.

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Idlafie - 28 Dec 2004 11:07 GMT

From the FAQ page of www.240sx.org

Disconnect the Throttle Position Sensor harness and turn the idle adj.
screw on the IAA to get the car to idle at 650 rpm. Reconnect the TPS
harness and your beloved should purr at 700 or so rpm. (The Factory
manual gives a +/- tolerance of 50 rpm.) The IAA is at the back of the
intake manifold. You can see it standing over the right (passenger side
for N.A.) fender and looking at the funky device with the dime size
recess for the adj. screw. It's partially hidden by the heater hoses
which run from the engine block to the firewall.

Hope this helps...good luck!!
ID
'95 SE

> Back on my old 95 200SX SE-R, my mechanic said there was a little screw you
> could just turn one way or another to adjust your idle speed. Is there
> something like that on my 240SX? I seem to be idling at about 600-700, where it
> vibrates too much. I'd rather have 800, which feels smoother and I assume is
> normal.

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Crunchy Cookie - 30 Dec 2004 04:45 GMT

Thanks guys, I'm sure that would've helped, but when I got my throttle body
cleaning, it raised my idle just as I expected, so problem solved. (It also
took care of my really stiff gas pedal, which was why I took it in to begin
with.)

What's funny is that my mechanic's diagrams (from ALLDATA I think) don't show
that I have such a screw but you both say I do. Do ALL engines (or at least all
Nissan engines) have an idle adjustment screw? Why would people screw with it?

(Hey Johnboy, how come you never reply to the newsgroup?)

> From the FAQ page of www.240sx.org
>
[quoted text clipped - 10 lines]
> ID
> '95 SE

--- Johnboy <jondne@knology.net> wrote:

> Yes, it is at the rear of the manifold on the idle air valve.
> Put your head down on the fender to look thru a bracket
> to see the big screw. This group says there is dirt buildup
> on the throttle plate causing the rough idle.

> > Back on my old 95 200SX SE-R, my mechanic said there was a little screw you
> > could just turn one way or another to adjust your idle speed. Is there
> > something like that on my 240SX? I seem to be idling at about 600-700, where it
> > vibrates too much. I'd rather have 800, which feels smoother and I assume is
> > normal.

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