Question about 1991 Nissan 300ZX

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High idle My 300zx idles high right after starting at aorund 2500 rpm then drops to about 1500 rpm after a minute or so. Is ther any way to adjust the idle? Or is ther something else going on? Thanks!!!!

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Has it always been this way as it sounds like it warms up and then runs at idle at an ideal rpm which is quite common for many cars although I haven't specifically seen this car run before. Are both idles higher than normal for your car? If so, I can suggest what you can do but if it runs fine otherwise, I don't think there is anything really wrong with it.

Posted on Jul 21, 2008

  • 1 more comment 
  • Benjamin Patri
    Benjamin Patri Jul 21, 2008

    To adjust the idle, the idle adjustment can be accessed on the carburetor. Look for the
    accelerator cable and the lever it is attached to. The idles speed
    adjusting screw should be connected to that. Clockwise will increase
    the idle.

  • Benjamin Patri
    Benjamin Patri Jul 21, 2008

    To adjust the idle, the idle adjustment can be accessed on the carburetor. Look for the
    accelerator cable and the lever it is attached to. The idles speed
    adjusting screw should be connected to that. Clockwise will increase
    the idle.

  • jamiem1416
    jamiem1416 Apr 16, 2014

    there's no carburator on a 91./ dah. It sounds like the air intaket gasket to me.Locaye the air intake. spray carb , or brake cleaner on the gasket between motor and AIG while running. If there is a change im idle, that is the problem . Spray the whole length of the intake, and hear the difference

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The throttle position sensor may be causing your issue----This sensor monitors the outside air temp.In the winter the throttle opens up far because th.e air temp is cold and vice versus

Posted on Jul 21, 2008

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http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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1 Answer

I have a high idle on my Nissan 300ZX what could cause this?


I have a Nissan 300zx twin turbo 1990.... The engine and car are in very good condition ... well serviced... The idle speed will not go below 2000 rpm can you help as there is no manual adjustment...????

Apr 22, 2010 | 1990 Nissan 300ZX

1 Answer

High idel


You may have a bad control valve or regulator. Did you adjust the idle properly?

1. Disconnect the connector on top
2. Adjust idle to around 650-700k rpm
3. Reconnect the electrical connection

After reconnecting, the idle should jump up around 700-750k rpm.
The idle screw is fail safe setting in case the ecu cannot set the idle. The rpm's set by the idle screw are supposed to be below the ecu/stock idle.

If this doesn't work, you may have a dirty or bad Idle Air Adjuster and/or Air Regulator. For information on cleaning that, you can refer to this page http://s95014253.onlinehome.us/63104/157335.html

You can test the IAA by supplying power to the plug with the car off. Listen for any clicks or humming. That will signify that it still may be working but is possibly stuck. The Air Regulator is for high idle for warming up your car. It has a bi-metal spring inside that rotates a disc closing off an airway to bring idle to normal after a couple minutes. If it dies it will stay open and give you permanent high idle. If it gets clogged usually no high idle for warm up.
You can remove it and peer through the end. If you see a thin sliver of light, it's open. Connect 12 volts + & -, wait a few minutes and see if it's now closed. If not, it's likely dead. It can be opened and cleaned if that's the issue.

Jun 12, 2009 | 1990 Nissan 300ZX

1 Answer

2004 Grand Am With High Idling Problems too!


Make sure your throttle cable is not bound up on anything. Also where the throttle cable ends at the throttle body make sure it moves freely and there is nothing obstructing its movement..Rpms are a little too high to be a vacuum leak.

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1 Answer

IDLES HIGH RPM(3200)


sounds like the tps is bad or idle control motor

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Wont smog


If the car idle on high rpm check if when you will step on the gas pedal over 2500 3000 rpm the car will start shaking and the will die if thats happening then check your mass air flo sensor ,or if there is no air leak that avoid the mass air flo sensor

Jan 21, 2009 | 1991 Nissan 300ZX

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