high idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sLip techniques · 06-09-2005, 03:03 PM

Im stumped as to why my idle is so damn high (around 1200-1400). I recently replaced my intake manifold gaskets,every single vacuum hose (even the ones behind the valve cover and the ones leading to the carbon canister), and i have correct timing. What other things can cause high idle? i have a stock ka24e.

s13gonwild · 06-09-2005, 03:20 PM

try reseting your ecu my 90 was doing this also..till i reset.

from 240sx.org

You need to leave all the sensors connected
2nd of all, the check engine light WILL NOT turn off until you reset the computer, to do this:
Find the computer(Behind the plastic piece by the passenger foot
Pull it out
Turn your key to the on position
You will see a flathead screw looking bolt on 1 side of the computer. Turn this fully clockwise
Wait at least 2 seconds
Turn it back to fully counterclockwise
This will then show the trouble code - (The check engine light will blink to show this, for instance, blink..blink..blink......blink..blink, will be 32)
After you read the code, you can start the engine
Turn the bolt back to the clockwise position for at least 2 seconds(While running)
Turn it back to the counterclockwise position
Now shut the car and then start it again, this should of removed the code.

sLip techniques · 06-09-2005, 03:22 PM

hmm ill try that, thanks steve-o

sLip techniques · 06-09-2005, 03:55 PM

hmm now it goes between 1000-1200

idlafie · 06-10-2005, 03:44 AM

Quote:

Originally Posted by sLip techniques

Im stumped as to why my idle is so damn high (around 1200-1400). I recently replaced my intake manifold gaskets,every single vacuum hose (even the ones behind the valve cover and the ones leading to the carbon canister), and i have correct timing. What other things can cause high idle? i have a stock ka24e.

With the engine off, clean out your AIV/IAV valve with carb cleaner. Once you clean the AIV/IAV valve, then disconnect your throttle position sensor subharness...should be three wires, black, white, green..???. Go ahead & start your car. By disconnecting the TPS subharness, your idle should either drop or rev higher. Using the phillips type screwhead on your IAV valve, (the phillips type screwhead is visible on the passengerside of the motor towards the rear firewall - should be right by the coolant lines that run into your firewall / passenger compartment - adjust your idle till you get it to 650 rpm +/- 50 RPM. Turn your motor off & reconnect your TPS subharness. Once you reconnect your TPS subharness, re-start your car. With the engine running again, your idle should reset to 700 rpm.
Anyhow, hope this helps..
ID

sLip techniques · 06-10-2005, 04:24 AM

thx man im going to try that today

sLip techniques · 06-10-2005, 04:03 PM

well it worked, thx idlafie

JayDM s13 · 06-12-2007, 11:25 PM

maybe i should do the same...im having the same problems...

Synicals13 · 06-13-2007, 02:48 AM

does s13gonwild and idlelafie's suggestions apply to sr20dets too? cuz i got it bad like slip tech, but on my sr.

06-09-2005, 03:03 PM	#1
sLip techniques Zilvia Member Join Date: Apr 2005 Location: So Cal Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	high idle Im stumped as to why my idle is so damn high (around 1200-1400). I recently replaced my intake manifold gaskets,every single vacuum hose (even the ones behind the valve cover and the ones leading to the carbon canister), and i have correct timing. What other things can cause high idle? i have a stock ka24e.

06-12-2007, 11:25 PM	#8
JayDM s13 Leaky Injector Join Date: May 2007 Location: middle of the FREAKIN' DESERT!! Age: 45 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	maybe i should do the same...im having the same problems... __________________

06-09-2005, 03:20 PM	#2
s13gonwild BANNED Join Date: Jan 2005 Location: cali Posts: 466 Trader Rating: (0) Feedback Score: 0 reviews	try reseting your ecu my 90 was doing this also..till i reset. from 240sx.org You need to leave all the sensors connected 2nd of all, the check engine light WILL NOT turn off until you reset the computer, to do this: Find the computer(Behind the plastic piece by the passenger foot Pull it out Turn your key to the on position You will see a flathead screw looking bolt on 1 side of the computer. Turn this fully clockwise Wait at least 2 seconds Turn it back to fully counterclockwise This will then show the trouble code - (The check engine light will blink to show this, for instance, blink..blink..blink......blink..blink, will be 32) After you read the code, you can start the engine Turn the bolt back to the clockwise position for at least 2 seconds(While running) Turn it back to the counterclockwise position Now shut the car and then start it again, this should of removed the code.

06-09-2005, 03:22 PM	#3
sLip techniques Zilvia Member Join Date: Apr 2005 Location: So Cal Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	hmm ill try that, thanks steve-o

06-09-2005, 03:55 PM	#4
sLip techniques Zilvia Member Join Date: Apr 2005 Location: So Cal Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	hmm now it goes between 1000-1200

06-10-2005, 04:24 AM	#6
sLip techniques Zilvia Member Join Date: Apr 2005 Location: So Cal Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	thx man im going to try that today

06-10-2005, 04:03 PM	#7
sLip techniques Zilvia Member Join Date: Apr 2005 Location: So Cal Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	well it worked, thx idlafie

06-13-2007, 02:48 AM	#9
Synicals13 Zilvia Member Join Date: Aug 2006 Location: WA Age: 38 Posts: 190 Trader Rating: (0) Feedback Score: 0 reviews	does s13gonwild and idlelafie's suggestions apply to sr20dets too? cuz i got it bad like slip tech, but on my sr.