Idle Adjust procedures on KA24DE 240sx with pictures. - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dkim1985 · 10-25-2012, 10:12 AM

Quote:

Originally Posted by sx261

so I've been having this issue...
when coming to a standstill.. for example like at a stoplight... i sometimes experience a fluctuation idle.
Any ideas to as what this could be?

it's hard to say..but try start by cleaning your IACV.

i got my car back from the mechanic anddd...they couldn't find anything wrong.

they did the smoke test, didn't see a leak anywhere.(i can still hear a hissing sound)
sprayed brakleen here and there..nothing happened.
eventually the fluctuations stopped and then idle was steady, though still high.
it hasn't been acting up since then so..looks like we'll just see when it starts acting up again.

any ideas?

sx261 · 10-25-2012, 10:19 AM

well i also hear a hissing sound... at first i thought it might just be the custom headers/straight pipe that came with the car when i bought it... my idle is normal its just that sometimes.. and not that often actually... that it kinda start fluctuating... at first i thought it might be the maf sensor? maybe not letting the ecu know how much gas to send? but idk cuz i remember fixing a family member's Camry lol and i fixed a similar issue by cleaning out the air temp sensor. so yeah idk... kinda clueless to what this might be

dkim1985 · 10-25-2012, 10:21 AM

Quote:

Originally Posted by sx261

well i also hear a hissing sound... at first i thought it might just be the custom headers/straight pipe that came with the car when i bought it... my idle is normal its just that sometimes.. and not that often actually... that it kinda start fluctuating... at first i thought it might be the maf sensor? maybe not letting the ecu know how much gas to send? but idk cuz i remember fixing a family member's Camry lol and i fixed a similar issue by cleaning out the air temp sensor. so yeah idk... kinda clueless to what this might be

hissing sounds usually mean and air/vacuum leak somewhere..

sx261 · 10-25-2012, 10:27 AM

and that would most likely be the cause of the fluctuating idle .... idk this is weird because its not an everyday thing... so hmmm..... could it be the air temp sensor?

tapdeznutz · 10-25-2012, 10:35 AM

i been dealing with same issues outlined here as well. what i can say is i just removed my AIVC (the system on the header side) and for the last week it just seems to idle and rev much cleaner, no lie. i have sohc with k&n drop in filter/headers/test pipe as my only mods. i do also do sea foam on a regular basis as well. gl everyone.

dkim1985 · 10-25-2012, 11:40 AM

Quote:

Originally Posted by tapdeznutz

i been dealing with same issues outlined here as well. what i can say is i just removed my AIVC (the system on the header side) and for the last week it just seems to idle and rev much cleaner, no lie. i have sohc with k&n drop in filter/headers/test pipe as my only mods. i do also do sea foam on a regular basis as well. gl everyone.

yeah, i seafoam once a yr, use fuel system cleaner every other oil change, do a wipe down of the throttle body and etc every yr.. have NO IDEA about the idle though. loll
I have a new egr system because i needed to pass smog(with a new magnaflow cat).

I'm just going to go ahead and replace all the air/vacuum hoses and hopefully that fixes something..lol.

240sxDavid · 02-06-2013, 02:35 AM

+1 on the EXACT same issues, except i didnt take mine to a mechanic

anyways i havent thaught about the air injection system ill check it out soon, lets get this sorted out!

dkim1985 · 02-06-2013, 09:49 AM

i changed my throttle body and that fixed my high idle.

driving-wise; it feels inconsistent. like sometimes, she'll pull hard. other times, she'll start bogging and just feel like crap.
i feel like theres a leak in my egr system..going to have to check that out later when i put on my new headers.

vas13hatch · 02-06-2013, 09:42 PM

I would change out all the vaccum lines. It's cheap, just really tedious to do it. Do them one at a time to make sure they're hooked up right and look for loose electrical connectors or frayed wires while you're diggin around in there.

zerodameaon · 02-06-2013, 10:13 PM

If you get lost or find missing vacuum lines there are plenty of decent line diagrams on the internet if you search google for them.

10-25-2012, 10:35 AM	#35
tapdeznutz Nissanaholic! Join Date: May 2011 Location: Long Beach Age: 41 Posts: 1,801 Trader Rating: (50) Feedback Score: 50 reviews	i been dealing with same issues outlined here as well. what i can say is i just removed my AIVC (the system on the header side) and for the last week it just seems to idle and rev much cleaner, no lie. i have sohc with k&n drop in filter/headers/test pipe as my only mods. i do also do sea foam on a regular basis as well. gl everyone. __________________ FS: DSS 1pc Steel Non ABS, 6bolt axles WTB: Boost Gauge, Hatch Roof Wing

02-06-2013, 09:49 AM	#38
dkim1985 Zilvia Addict Join Date: Apr 2011 Location: Gardena, CA Posts: 771 Trader Rating: (28) Feedback Score: 28 reviews	i changed my throttle body and that fixed my high idle. driving-wise; it feels inconsistent. like sometimes, she'll pull hard. other times, she'll start bogging and just feel like crap. i feel like theres a leak in my egr system..going to have to check that out later when i put on my new headers. __________________ FS: Nismo R-Tune Camshafts for VQ35DE.

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10-25-2012, 10:19 AM	#32
sx261 Join Date: Jul 2012 Location: Merced Age: 27 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	well i also hear a hissing sound... at first i thought it might just be the custom headers/straight pipe that came with the car when i bought it... my idle is normal its just that sometimes.. and not that often actually... that it kinda start fluctuating... at first i thought it might be the maf sensor? maybe not letting the ecu know how much gas to send? but idk cuz i remember fixing a family member's Camry lol and i fixed a similar issue by cleaning out the air temp sensor. so yeah idk... kinda clueless to what this might be

10-25-2012, 10:27 AM	#34
sx261 Join Date: Jul 2012 Location: Merced Age: 27 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	and that would most likely be the cause of the fluctuating idle .... idk this is weird because its not an everyday thing... so hmmm..... could it be the air temp sensor?

02-06-2013, 02:35 AM	#37
240sxDavid Zilvia Junkie Join Date: Dec 2011 Location: Whittier CA Posts: 324 Trader Rating: (3) Feedback Score: 3 reviews	+1 on the EXACT same issues, except i didnt take mine to a mechanic anyways i havent thaught about the air injection system ill check it out soon, lets get this sorted out!

02-06-2013, 09:42 PM	#39
vas13hatch Join Date: Feb 2013 Location: BFE VA Age: 30 Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	I would change out all the vaccum lines. It's cheap, just really tedious to do it. Do them one at a time to make sure they're hooked up right and look for loose electrical connectors or frayed wires while you're diggin around in there.