1991-1994 240sx: Setting adjusting idle tutorial

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vancouverbc
Posts: 3197
Joined: Thu Oct 30, 2003 1:30 am
Car: 1991 240sx

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Idle specs:-Idle speed (in "N" position, No-Load) 700 +/- 50 rpm-Idle speed (In "N" position, Air Conditioning ON) 1000 +/- rpm

Tools:

Flat head screwdriverFlashlight

Adjusting the idle

Setting idle while engine is on. Disconnect the TPS. Turn engine on and adjust idle screw. Your idle will be 50 rpm lower with TPS disconnected so shoot for 650 rpm to get 700 rpm. Make sure engine is warmed up and your base timing is at spec.

Turn the idle adjusting screw on the IAA clockwise to lower idle or counter clockwise to increase idle. The IAA is at the back of the intake manifold by the firewall passenger side. You can see it standing over the passenger side wheel . Use a flashlight. Your beloved should purr at 700 or so rpm. (The Factory manual gives a +/- tolerance of 50 rpm.)

Location of idle adjusting screw



Location of throttle position sensor plug(smaller than the other plug in pic)









Advanced Discussion

How to adjust throttle plate: (dont do this except if someone else has played with it)Modified by vancouverbc at 7:37 PM 12/24/2009

Modified by vancouverbc at 7:42 PM 12/24/2009
Modified by vancouverbc at 7:43 PM 12/24/2009


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thoughtless
Posts: 116
Joined: Wed Apr 01, 2009 9:13 am
Car: 1997 silvermoss 240sx SE
Location: Clarksville, TN
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thanks a ton

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johnny5
Posts: 177
Joined: Sun Mar 01, 2009 12:43 pm
Car: 91 red 240 hatch
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to bad its hard as hell to get to if you have anti lock brakes lol i need to do this so bad and i cant get to it lol


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