revs drop while braking, while coming to a full stop. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*handinpants* · 05-27-2008, 04:59 PM

So I have a 97 180sx sr20det in my car with a j4 ecu, the idle is set to about 1000 rpms, well maybe 900 rpms. anyways while driving, i need to slow down to stop, so i would put it in nuetral, and slow down to a stop. whether it be in traffic or at a stoplight or sign, Some times, well often the rpm level will drop to 500 or 600 rpm level, and then it will go back to the regular idle speed as soon as i am stopped. but it would dip down. I am not sure what this is. I am running a FMIC, but i am still using the stock recirculating BOV.

any help will do. If i have left out any information that is relevant to diagnosing this problem please ask, and i will reply.
-Thanks

punxva · 05-27-2008, 05:00 PM

IACV, it's a pretty common problem

makulit054 · 05-27-2008, 05:20 PM

yeah, I have a simliar problem. It's an intermittent problem. I've cleaned my IACV with cleaner and it still dips occasionally.

*handinpants* · 05-29-2008, 02:39 PM

What is a IACV?

sbc · 05-29-2008, 05:36 PM

Intake Air Control Valve

Clean the plunger so that it doesn't seize or stick.
Also check that the spring isn't broken.

And get yourself an FSM.

*handinpants* · 05-30-2008, 03:50 AM

where on the engine can i find this valve?" pictures?
'

flip3d · 05-30-2008, 09:08 AM

+1 for Idle Air Control Valve.

It's on the intake manifold in between the 2nd and 3rd runners. Has a screw on top. You cant miss it.
Edit: Thats where it is on the S13 SR. Not sure about the 180 SR.

EDacIouSX · 05-30-2008, 09:16 AM

i think basically black and red tops are identical engines aren't they?

05-27-2008, 04:59 PM	#1
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 38 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	revs drop while braking, while coming to a full stop. So I have a 97 180sx sr20det in my car with a j4 ecu, the idle is set to about 1000 rpms, well maybe 900 rpms. anyways while driving, i need to slow down to stop, so i would put it in nuetral, and slow down to a stop. whether it be in traffic or at a stoplight or sign, Some times, well often the rpm level will drop to 500 or 600 rpm level, and then it will go back to the regular idle speed as soon as i am stopped. but it would dip down. I am not sure what this is. I am running a FMIC, but i am still using the stock recirculating BOV. any help will do. If i have left out any information that is relevant to diagnosing this problem please ask, and i will reply. -Thanks __________________

05-29-2008, 02:39 PM	#4
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 38 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	What is a IACV? __________________

05-30-2008, 03:50 AM	#6
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 38 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	where on the engine can i find this valve?" pictures? ' __________________

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05-27-2008, 05:20 PM	#3
makulit054 Zilvia Member Join Date: May 2007 Location: socal Posts: 215 Trader Rating: (1) Feedback Score: 1 reviews	yeah, I have a simliar problem. It's an intermittent problem. I've cleaned my IACV with cleaner and it still dips occasionally.

05-29-2008, 05:36 PM	#5
sbc Leaky Injector Join Date: Jul 2005 Location: Canada Posts: 75 Trader Rating: (2) Feedback Score: 2 reviews	Intake Air Control Valve Clean the plunger so that it doesn't seize or stick. Also check that the spring isn't broken. And get yourself an FSM.

05-30-2008, 09:08 AM	#7
flip3d Zilvia FREAK! Join Date: Feb 2008 Location: Ft Lauderdale, FL Age: 33 Posts: 1,473 Trader Rating: (1) Feedback Score: 1 reviews	+1 for Idle Air Control Valve. It's on the intake manifold in between the 2nd and 3rd runners. Has a screw on top. You cant miss it. Edit: Thats where it is on the S13 SR. Not sure about the 180 SR.

05-30-2008, 09:16 AM	#8
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 35 Posts: 4,527 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	i think basically black and red tops are identical engines aren't they?