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View Full Version : S15 engine start up RPM problem

izzy99
10-22-2007, 11:33 PM
Well here I am again but my question this time is how come when I start my S15 engine and my RPM is so high? it REV up to 1100 RPM even the car is warmed up and it stay so steady. Does this happen to you SR people out there?

What's the problem with it, :loco:
fliprayzin240sx
10-22-2007, 11:37 PM
idle control? Did you mess around with AIVC?
izzy99
10-22-2007, 11:50 PM
How can I fix it and what's AIVC? BTW I never stepped on the gas pedal and it's still 1100 RPM all the time.
idle control? Did you mess around with AIVC?
fliprayzin240sx
10-23-2007, 12:05 AM
idle air control valve. Its on the intake manifold. Its a box shaped part on the intake manifold and that has a screw plastic screw on it. You should be able to see it from the top. Turn the screw to see if your idle will go up or down. Its basically a valve that lets air bypass the throttle body so air will still get into your engine even tho your not opening the throttle body with the pedal.

Heres a pix...
izzy99
10-23-2007, 12:10 AM
idle air control valve. Its on the intake manifold. Its a box shaped part on the intake manifold and that has a screw plastic screw on it. You should be able to see it from the top. Turn the screw to see if your idle will go up or down. Its basically a valve that lets air bypass the throttle body so air will still get into your engine even tho your not opening the throttle body with the pedal.

Heres a pix...


OMG, you just fixed my problem.. thanks in a million!!
izzy99
10-26-2007, 05:27 PM
which way should i turn it. well i just turned it in both ways but nothing seem to go down at all. why?
izzy99
10-26-2007, 06:41 PM
help my fellow silvia!!
statik
10-26-2007, 08:18 PM
Turn the screw in to lower the idle, turn the screw out to increase it. I'm pretty sure its the same method for the s13 motor, so start up the car, disconnect the TPS, turn off the car, start it again and adjust the idle from the IACV screw.
Chrischeezer
10-26-2007, 11:14 PM
if the motor is bone stock you should not have to adjust your IACVl..

i would bet the TPS is not set right.. they always getting banged around
Z U L8R
10-26-2007, 11:26 PM
tps could be a possible problem, i'll bet more on a vacuum leak, but hopefully adjusting your idle cures you.
izzy99
10-27-2007, 01:15 AM
sorry be such a nub but where is my TPS on my s15 and ect.. you guys said about leakage? Please give me more details or pictures.

I AM JUST A NUB!!
shifteds14
10-27-2007, 01:46 AM
sorry be such a nub but where is my TPS on my s15 and ect.. you guys said about leakage? Please give me more details or pictures.

I AM JUST A NUB!!

tps = throttle position sensor
check around throttle body
i might be wrong but i belieave its on the left side lower throttle body
Folken
10-27-2007, 02:07 AM
Hey Izzy if I were you i'd try to find a s15 Factory Service Manual(FSM) online to download, they help out ALOT when your trying to fix things and learn about your car... I tried finding you one for you but hell if my lazy ass wants to spend 30mins searching
statik
10-27-2007, 08:51 AM
tps could be a possible problem, i'll bet more on a vacuum leak, but hopefully adjusting your idle cures you.

Vacuum leak after the MAF would cause a rough idle, increase in air, no increase in fuel.
izzy99
10-28-2007, 04:14 AM
Vacuum leak after the MAF would cause a rough idle, increase in air, no increase in fuel.


what's the best way to detect leak in Vacuum leak? and so such other leaks on the engine?