Weird Idle

ONLY for ADVANCED technical discussion about the 240sx!
NoStickDrift
Posts: 103
Joined: Thu Aug 04, 2005 10:56 am
Car: 1989 240sx

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I know there are tons of stuff on the idle of a 240sx, And I have searched. But mine seems a bit different of a problem. So here it goes. My 89 when in park idles fine about 700 - 800rpms. When in drive wth my foot on the brake its at 550 - 650rpms. And it fluctuates pretty bad sometimes. If i turn the AC on, it will idle at about a constant 950rpms. Why would it be constant with the ac on, and not constant with it off. Also it was doing this before I installed a cone intake, but its a little bit worse now. Any suggestions would be helpfull.


NoStickDrift
Posts: 103
Joined: Thu Aug 04, 2005 10:56 am
Car: 1989 240sx

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Comon guys I need some help hear, some of the techs at my shop said it could be a vac leak, any thoughts?

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Ni2s4s0aSnX
Posts: 667
Joined: Tue Apr 19, 2005 8:39 am
Car: Nissan 240sx 2.4L 12Valve

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Sounds like a sensor problem or sensor wire problem.

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yangs13
Posts: 379
Joined: Sat Jan 22, 2005 6:42 am
Car: 1993 240sx-Dead, 2001 Maxima

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if it starts to idle really rough and at low rpm, it could be one of your fuel injectors. when my car started to idle rough and the engine would shake violently, i took it to a local shop and had dianostics on it, it turned out to be a bad fuel injector.


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