Author Topic: Adjusting the idle?  (Read 4081 times)

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Offline mitza

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Adjusting the idle?
« on: Sep 4, 2002, 12:54PM »
My TRX usually Idles around 900rpm when not moving...(obviously)...The......occasinally...... it drops to round 300-400 rpm and the car shakes voilently. Then it may go up again.......when it drops....I rev it for a little while, but then usually drops to that 400 mark again..and feels like it is about to stall. Whats the problem here?
Its only an intiminant problem,comes and goes.
I was told that it may be idling too low? Can we adjust that? Could it be something else? Im sure there could be a million answer for this, I just want the right one please :P
I was on 240sx.org (same motor as us) and they were talking about some IAA value? Where is that on our car? And more importantly, what is it?
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline Adam J-TRX

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Re: Adjusting the idle?
« Reply #1 on: Sep 4, 2002, 08:35PM »
If you take the intake tube off the plenum (the thing marked ECCS), you'll see a flap that is moved by the throttle cable. Just before that flap, there is a small hole which is involved in idle air control. Head down to Autobarn and get yourself some carby/throttle-body cleaner. Disconnect the tubes that run from this hole and clean them out by spraying in some throttle-body cleaner. Basically just clean that air route. While you're at it, clean the throttle-body and plenum chamber as well. Put it all back, start it up, run it awhile, give it a  couple of revs... then let me know if that's helped.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline Adam J-TRX

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Re: Adjusting the idle?
« Reply #2 on: Sep 4, 2002, 08:38PM »
Oh, and if you DO wanna fuck around with the idle (which personally I wouldn't do), the screw is located on the opposite end of the plenum chamber, facing the front of the car.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline mitza

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Re: Adjusting the idle?
« Reply #3 on: Sep 5, 2002, 02:38AM »
That flap.being the TB?? Cleaned out the air intake using the special cleaner as you suggested......didnt quite understand what you meant by that little small hole which is involved in the idle air control? Couldnt find it.
I guess its running a bit better now.it should, its all clean. Have to give it a few days to see if this rough idling occurs again. As for the idle thing......why dont I want to mess around with it? I found where it is :P
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline Adam J-TRX

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Re: Adjusting the idle?
« Reply #4 on: Sep 5, 2002, 04:31AM »
You didn't find that hole?? ??? Weird... it is right before the butterfly at the bottom.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline mitza

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Re: Adjusting the idle?
« Reply #5 on: Sep 5, 2002, 06:04AM »
maybe i over loked it...will look for it next time.i could be bother taking everything apart! lol
that for your help! :)
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline mitza

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Re: Adjusting the idle?
« Reply #6 on: Sep 20, 2002, 01:18AM »
OK Guys......its still happening....
At the lights, or when I come to a stop. My RPM just ives to 500, and rattles the car like hell.
It maybe float around there for a bit, or jump straight back up.
It occurs when in gear, with my foot on the clucth and in neutral.
What is causeing this? Its almost like its missing or something? But its a long miss...llike all 4 cyclinders, one after the other! Im starting to think my injectors could be dirty? Any other reasons?
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline nizgurl

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Re: Adjusting the idle?
« Reply #7 on: Sep 23, 2002, 06:42PM »
Maybe your spark plugs have had it?  Or one of the coils might be dying?  I know when 91nismo ripped off one of his coils his car shook like it was gonna fall appart  :P

Check those.  I dunno  :-/  Just thinking bout other stuff that might cause it to do that.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »
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Offline MR.TRX

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Re: Adjusting the idle?
« Reply #8 on: Sep 24, 2002, 10:14AM »
changed your fuel filter recently???
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »
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Offline Nismo

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Re: Adjusting the idle?
« Reply #9 on: Sep 24, 2002, 11:25AM »
The IAA u speak of is the Idle Air Adjusting Unit, located to the left of the ECCS / plenum chamber...my car experiences the same thing - low idle but only when cold. The IAA and the Auxillary Air Control Valve all play their part in idle / warm up RPM. I have cleaned out these 2 parts on mine but unfortunately this didnt fix it - both these parts from nissan total approx $600, so hopefully yours are ok.

If you have the time, clean these 2 parts with the carby cleaner. A simple check first though: there is an electrical wire with rubber cap that sits on the back of the AAC valve - if u disconnect this with the engine running there should be a dramatic change in RPM [cant remember whether high or low] but if there is no change then these parts are either blocked or faulty! have fun...
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline weasel

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Re: Adjusting the idle?
« Reply #10 on: Oct 6, 2002, 12:41AM »
Hey mitza did you figure out what this is cause mine is doing it now  :'(

it started yesterday after i took my battery out to charge it after i connected the battery back up it wouldn't idle properly so i gave it a rev and it didn't like that either it coughed and spat for a second then rrr rrr  rrr and then it revved after about 2500 rpm also its like it has a massive flat spot in the acceleration

like mitzas prob it comes and goes

Quote
If you take the intake tube off the plenum (the thing marked ECCS), you'll see a flap that is moved by the throttle cable. Just before that flap, there is a small hole which is involved in idle air control


this hole is it right near the butterfly or is it down the intake tube a bit near the airflow meter ???
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »
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Offline mitza

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Re: Adjusting the idle?
« Reply #11 on: Oct 8, 2002, 12:43AM »
hmm..............have to try that nismo.............thanx for the advice......weasel, ill get back to you......
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline noss

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Re: Adjusting the idle?
« Reply #12 on: Oct 9, 2002, 09:33PM »
how clean are your air filters? if they are black with crap & have bugs stuck in em, that could be your problem with the rough idle.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

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Offline weasel

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Re: Adjusting the idle?
« Reply #13 on: Oct 10, 2002, 05:45AM »
after a few days mine hasn't come back yet so hmmm ???
it went away right after i bought some carby cleaner but before i used it on it  >:( not happy

i'm still gonna clean it just to be safe ;)
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »
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Offline T-REX

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Re: Adjusting the idle?
« Reply #14 on: Oct 10, 2002, 11:36AM »
I had the same problem about a year ago.... I took it to a mechanic and he said the AAC valve (Idle up Solinoid)need replacing..... I got a new one from niscare in falkner..... for $360 trade price.and now its working fine..... before I got the new one I just uped the idle to about 1000-1100 and when the car idled down or I put the ac on it was still around the 700 rpm mark and it was a fairly smoth idle..... So either fork out around $500-550 retail for a new idle up solinoid or just up the revs.... hope this helps ya
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

Offline noss

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Re: Adjusting the idle?
« Reply #15 on: Oct 10, 2002, 09:36PM »
well, i had this problem once upon a time too... just over a year ago, and i looked up the problem on the 240sx.org faq, and told my mechanic what the problem was and he fixed it within an hour. he didnt replace it though. so i dunno. but it was the aac valve as t-rex (and some others) have said.
« Last Edit: Jan 1, 1970, 10:00AM by 1043326800 »

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