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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 10-12-2019, 06:33 AM   #1
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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
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Old 10-12-2019, 09:34 AM   #2
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If you cap both, hows it run? I think they are Cruise control related.
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Old 10-12-2019, 12:03 PM   #3
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im pretty sure the top one goes to the fuel pressure regulator
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Old 10-12-2019, 04:59 PM   #4
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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
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Old 10-12-2019, 06:48 PM   #5
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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.
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Old 10-13-2019, 11:26 AM   #6
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Ok cool thanks guys. I’ll check soon as I’m home
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Old 10-13-2019, 04:58 PM   #7
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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.
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Old 10-14-2019, 08:24 PM   #8
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Quote:
Originally Posted by kyral View Post
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.
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Old 10-15-2019, 01:43 PM   #9
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Originally Posted by kennedy8383 View Post
Correct. Don't forget to clamp it so it doesn't pop out.
Why would it pop off? Its under vacuum...
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Old 10-15-2019, 02:55 PM   #10
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Quote:
Originally Posted by S14rebuild View Post
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
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Old 10-17-2019, 10:04 AM   #11
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yup...I forgot about boost on recent build and was wondering what loud whistling was a few days later lol
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