Dont kill me...... vacuum question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

gabefromcali · 10-12-2019, 06:33 AM

For the life of me I cannot figure out where this vacuum line leads to. Its right next to the IACV. Does anyone know where this goes?

Also this guy? Its coming from right next to the throttle body

I tried searching around but couldnt specifically find where these went. Any help is much appreciated

5280VertDET · 10-12-2019, 09:34 AM

If you cap both, hows it run? I think they are Cruise control related.

kyral · 10-12-2019, 12:03 PM

im pretty sure the top one goes to the fuel pressure regulator

gabefromcali · 10-12-2019, 04:59 PM

If the one in the top image is capped it seems to bump the idle up just a tick, maybe 2-300 rpm or so. The one in the lower image does nothing when capped.

Sorry I didnt mention but its a 97 ka24de if that makes any difference. All stock just has an aftermarket intake

Pacman · 10-12-2019, 06:48 PM

The second one is supposed to connect to the intake just before the throttle body. I'm unsure what it does, it's dark out now.

The first I believe is fuel regulator vacuum, as previously stated.

gabefromcali · 10-13-2019, 11:26 AM

Ok cool thanks guys. I’ll check soon as I’m home

gabefromcali · 10-13-2019, 04:58 PM

Woohoo idle issue fixed!! Thanks a bunch!!

Also, yes the vacuum line near the IACV did go to the fuel pressure regulator, for anyone in the future thats having the same issue.

kennedy8383 · 10-14-2019, 08:24 PM

Quote:

Originally Posted by kyral

im pretty sure the top one goes to the fuel pressure regulator

Correct. Don't forget to clamp it so it doesn't pop out.

S14rebuild · 10-15-2019, 01:43 PM

Quote:

Originally Posted by kennedy8383

Correct. Don't forget to clamp it so it doesn't pop out.

Why would it pop off? Its under vacuum...

kyral · 10-15-2019, 02:55 PM

Quote:

Originally Posted by S14rebuild

Why would it pop off? Its under vacuum...

its for a boosted motor, so they dont pop off, but like you said its under vacuum on a NA

jedi03 · 10-17-2019, 10:04 AM

yup...I forgot about boost on recent build and was wondering what loud whistling was a few days later lol

10-12-2019, 06:33 AM	#1
gabefromcali Leaky Injector Join Date: Sep 2015 Location: CA Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	Dont kill me...... vacuum question For the life of me I cannot figure out where this vacuum line leads to. Its right next to the IACV. Does anyone know where this goes? Also this guy? Its coming from right next to the throttle body I tried searching around but couldnt specifically find where these went. Any help is much appreciated

10-12-2019, 09:34 AM	#2
5280VertDET Nissanaholic! Join Date: Aug 2013 Location: Denver Age: 37 Posts: 2,052 Trader Rating: (14) Feedback Score: 14 reviews	If you cap both, hows it run? I think they are Cruise control related. __________________ S13 Vert \| SR \| PE1420 \| 5-Speed \| 15x9.5 - 0 \|

10-12-2019, 12:03 PM	#3
kyral Zilvia Junkie Join Date: Nov 2012 Location: wisconsin Age: 29 Posts: 447 Trader Rating: (7) Rides Gallery: kyral Feedback Score: 7 reviews	im pretty sure the top one goes to the fuel pressure regulator __________________ The Game you lose haha

10-12-2019, 06:48 PM	#5
Pacman Zilvia FREAK! Join Date: Sep 2003 Location: Ohio Age: 33 Posts: 1,147 Trader Rating: (1) Feedback Score: 1 reviews	The second one is supposed to connect to the intake just before the throttle body. I'm unsure what it does, it's dark out now. The first I believe is fuel regulator vacuum, as previously stated. __________________ In search of a Zenki S14 right side (passenger) fender and straight hood that are rust free.

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10-12-2019, 04:59 PM	#4
gabefromcali Leaky Injector Join Date: Sep 2015 Location: CA Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	If the one in the top image is capped it seems to bump the idle up just a tick, maybe 2-300 rpm or so. The one in the lower image does nothing when capped. Sorry I didnt mention but its a 97 ka24de if that makes any difference. All stock just has an aftermarket intake

10-13-2019, 11:26 AM	#6
gabefromcali Leaky Injector Join Date: Sep 2015 Location: CA Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	Ok cool thanks guys. I’ll check soon as I’m home

10-13-2019, 04:58 PM	#7
gabefromcali Leaky Injector Join Date: Sep 2015 Location: CA Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	Woohoo idle issue fixed!! Thanks a bunch!! Also, yes the vacuum line near the IACV did go to the fuel pressure regulator, for anyone in the future thats having the same issue.

10-17-2019, 10:04 AM	#11
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,786 Trader Rating: (8) Feedback Score: 8 reviews	yup...I forgot about boost on recent build and was wondering what loud whistling was a few days later lol