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PostPosted: Sun Oct 18, 2009 2:44 am 
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T04 Hybrid
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Car: S15
Hey guys, recently purchased a redtop sr20det 180sx, hasnt been started in about 8 months, pretty much stock other then exhaust. The car cold starts fine: idles at 1500rpms, then drops as per usual to about 900rpm, after 5 minutes or so of warming up, the idle raises to 1800-2000rpms, and it just stays there. if i turn on aircon it increases the idle to 2100rpm. Any idea whats going on?


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PostPosted: Sun Oct 18, 2009 3:15 am 
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TO4

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Car: 200sx S14.5
stepper motor playing up and raising the revs to compensate for something else ?


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PostPosted: Sun Oct 18, 2009 1:24 pm 
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stepper motor??

try the idle control valve. might be stuck open/closed. take it off the manifold and give it a good clean out with carby cleaner. you might be able to disassemble it further to get the carbon out

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PostPosted: Sun Oct 18, 2009 1:35 pm 
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TO4

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Car: 200sx S14.5
isn't the stepper motor where the TPS is ? it adjusts idle according to how much load is on the motor
ie A/C ?


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PostPosted: Sun Oct 18, 2009 3:39 pm 
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Takumi
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Nissan don't tend to use stepper motors for idle control.

They have an idle control solenoid (actually two) to control the idle speed and fast idle (for A/C, P/S load, etc)

The valve can clog up and cause problems, but a dodgy temp sensor, wiring, plugs, air leaks, etc can all have similar symptoms.

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PostPosted: Fri Oct 30, 2009 7:27 pm 
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T04 Hybrid
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Hey guys, thanks for all the input, i think it could be the idle control valve;
i've been lazy to clean it out and after a week of driving the idle issue went away. just yesterday i decided to clean the engine bay with degreaser, and now the issue is back, when i discconect the plug going to the idle control valve it idles fine, but as soon as i plug it back in the idle jumps back to 2000rpms on idle. When the plug is unplugged and i turn on aircon the revs dont rise to compensate. Do these symptoms all point to the idle control valve?


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PostPosted: Fri Oct 30, 2009 8:01 pm 
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TO4

Joined: Sun Jun 14, 2009 1:46 pm
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Car: 200sx S14.5
it sounds like that's the fault, because if it was in good condition and you d/c it, then it shouldn't have affect the idle at all


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PostPosted: Fri Oct 30, 2009 8:14 pm 
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yup, easy fix!

remove, clean, replace :)

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PostPosted: Fri Oct 30, 2009 10:13 pm 
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T04 Hybrid
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sweett, thanks for all the help guys, i'll get a crack on it tonight.


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PostPosted: Tue Nov 03, 2009 3:27 pm 
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how did you go??

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PostPosted: Tue Nov 03, 2009 10:01 pm 
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T04 Hybrid
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Excellent! :D didnt realise how dirty the whole throttle body was, as soon as i started the was dirty gunk and oil everywhere!, but after the clean it now idles at 900rpms =], thanks for all the help!


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PostPosted: Wed Nov 04, 2009 2:58 pm 
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no problems

its probably worthwhile removing the entire intake manifold and giving it a clean out

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