idle doesnt want to go down - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jkgaddis · 01-21-2007, 08:04 AM

so i have a freshly swapped in sr and i start it up and..... 1500rpms. so i go through the fsm and all that jazz. im confused here, it says to check timing first but the r's must be below 1g. so i went to lower the idle and i didnt just as the fsm says there and it starts to go down as im turning the screw and then it will jump back up to like 2000rpms. im lost, timing has to be done at less than 1000 but i cant even get it there. AHHH. any help is greatly appreciated. oh yeah, i searched and found a bunch of threads on adjusting idle but no one with my exact problem.
thanks for any ideas.

ladiesman8527 · 01-21-2007, 09:11 AM

does the idle drop at all when the motor warms up?

jkgaddis · 01-21-2007, 09:19 AM

nope, just stays high. im about to go over to my parents house (they have a garage, i have an apartment) and try again. i got a computer over there too though so keep ideas coming and ill post up if i get any results. THANKS

leonb2004 · 01-21-2007, 09:26 AM

Sounds like it definetily must be a vacuum issue. Maybe you have a line hooked up wrong, or just simply a vacuum/boost leak.

IngS14 · 01-21-2007, 10:53 AM

check your timming again.

jkgaddis · 01-21-2007, 11:52 AM

thought my rpm's had to be below 1000 to set timing properly. as per fsm.
def not a vacuum problem. been over the system like 9 times. retightened everything.

redsuns3838 · 01-21-2007, 12:56 PM

have you tried cleaning the AICV? take it off and clean it with carb cleaner. that might help. those things DO get dirty.

also, you should set timing by lifting the valve cover as per FSM.

my leaky BOV causes idle to go all over the damn place btw. going up and down 500-900 and then going all the way up to 1500 for a while, then dropping down to 1000...etc.

I would adjust timing and clean AICV first. check you BOV too although I doubt thats the problem.

s13poop · 01-21-2007, 02:30 PM

http://www.zilvia.net/f/showthread.php?t=96967

^ this thread should help

clean your IACV and your intake butterfly with intake cleaner costs $3 from your local kragen

my car had stumbling/ high idle and this smoothed it out to 700rpm

if that doesn't work (which it should)

check your vaccum lines or for a dirty MAF

good luck!

Dream240 · 01-22-2007, 06:15 AM

I had a similar problem with my idle and found that the small vaccumm nose that plugs into the bottom of the throttle body was clogged!!! Replaced it and bam! steady low idle.

I have a KA but I'm pretty sure you have the same or similar hose. It's a hose that helps regulate idle at closed throttle....worth a try.

01-21-2007, 08:04 AM	#1
jkgaddis Leaky Injector Join Date: Aug 2006 Location: St Petersburg, FL Age: 40 Posts: 85 Trader Rating: (0) Feedback Score: 0 reviews	idle doesnt want to go down so i have a freshly swapped in sr and i start it up and..... 1500rpms. so i go through the fsm and all that jazz. im confused here, it says to check timing first but the r's must be below 1g. so i went to lower the idle and i didnt just as the fsm says there and it starts to go down as im turning the screw and then it will jump back up to like 2000rpms. im lost, timing has to be done at less than 1000 but i cant even get it there. AHHH. any help is greatly appreciated. oh yeah, i searched and found a bunch of threads on adjusting idle but no one with my exact problem. thanks for any ideas. __________________ I'm a zilvia criminal.... I recieved an infraction

01-21-2007, 09:19 AM	#3
jkgaddis Leaky Injector Join Date: Aug 2006 Location: St Petersburg, FL Age: 40 Posts: 85 Trader Rating: (0) Feedback Score: 0 reviews	nope, just stays high. im about to go over to my parents house (they have a garage, i have an apartment) and try again. i got a computer over there too though so keep ideas coming and ill post up if i get any results. THANKS __________________ I'm a zilvia criminal.... I recieved an infraction

01-21-2007, 10:53 AM	#5
IngS14 Zilvia Addict Join Date: Jul 2004 Location: DriftHeaven,CA Age: 45 Posts: 647 Trader Rating: (7) Feedback Score: 7 reviews	check your timming again. __________________

01-21-2007, 11:52 AM	#6
jkgaddis Leaky Injector Join Date: Aug 2006 Location: St Petersburg, FL Age: 40 Posts: 85 Trader Rating: (0) Feedback Score: 0 reviews	thought my rpm's had to be below 1000 to set timing properly. as per fsm. def not a vacuum problem. been over the system like 9 times. retightened everything. __________________ I'm a zilvia criminal.... I recieved an infraction

01-22-2007, 06:15 AM	#9
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	I had a similar problem with my idle and found that the small vaccumm nose that plugs into the bottom of the throttle body was clogged!!! Replaced it and bam! steady low idle. I have a KA but I'm pretty sure you have the same or similar hose. It's a hose that helps regulate idle at closed throttle....worth a try. __________________ Don't mess with my monkey...he's loaded.

01-21-2007, 09:11 AM	#2
ladiesman8527 Zilvia Junkie Join Date: Dec 2005 Location: Collierville, TN Age: 38 Posts: 429 Trader Rating: (0) Feedback Score: 0 reviews	does the idle drop at all when the motor warms up?

01-21-2007, 09:26 AM	#4
leonb2004 Leaky Injector Join Date: Feb 2005 Location: AL Posts: 71 Trader Rating: (0) Feedback Score: 0 reviews	Sounds like it definetily must be a vacuum issue. Maybe you have a line hooked up wrong, or just simply a vacuum/boost leak.

01-21-2007, 12:56 PM	#7
redsuns3838 Zilvia Addict Join Date: Nov 2004 Location: dog town Posts: 969 Trader Rating: (0) Feedback Score: 0 reviews	have you tried cleaning the AICV? take it off and clean it with carb cleaner. that might help. those things DO get dirty. also, you should set timing by lifting the valve cover as per FSM. my leaky BOV causes idle to go all over the damn place btw. going up and down 500-900 and then going all the way up to 1500 for a while, then dropping down to 1000...etc. I would adjust timing and clean AICV first. check you BOV too although I doubt thats the problem.

01-21-2007, 02:30 PM	#8
s13poop Post Whore! Join Date: Nov 2005 Location: Pomona, SOCAL 909 Posts: 3,330 Trader Rating: (3) Rides Gallery: s13poop Feedback Score: 3 reviews	http://www.zilvia.net/f/showthread.php?t=96967 ^ *this thread should help* clean your IACV and your intake butterfly with intake cleaner costs $3 from your local kragen my car had *stumbling/ high idle* and this *smoothed* it out to *700rpm* if that doesn't work (which it should) check your vaccum lines or for a dirty MAF good luck!