Tiny MAP sensor housing vacuum hose re-connecting
Thread Starter
Intermediate
Joined: Dec 2018
Posts: 29
Likes: 4
From: Northern Virginia
Tiny MAP sensor housing vacuum hose re-connecting
I am reinstalling my LS1 intake and looking for tip or trick to get the tiny vacuum hose re-connected to the MAP sensor housing on the back of the intake when putting everything back together. I can't get my hand back there when the intake is on but the vacuum line is not long enough to connect if the intake is not on. I tried a search but did not find anything.
Pro
Joined: Apr 2018
Posts: 563
Likes: 201
From: Montgomery City, MO
The "trick" I used is replacing that entire run of vacuum line with old fashioned hose, separate of the harness. It was a PITA b/c you have to remove the left fender to get to the end that connects to the HVAC stuff, but it makes pulling / replacing the intake a 30 minute job with zero cussing.
Tech Contributor
Joined: Jan 2007
Posts: 19,511
Likes: 1,186
From: Dyer, IN
I am reinstalling my LS1 intake and looking for tip or trick to get the tiny vacuum hose re-connected to the MAP sensor housing on the back of the intake when putting everything back together. I can't get my hand back there when the intake is on but the vacuum line is not long enough to connect if the intake is not on. I tried a search but did not find anything.
Instructor
Joined: Jun 2020
Posts: 116
Likes: 55
From: Colorado Springs
I added a 'nipple' vacuum hose splice fitting and extended the vacuum hose with an extra length to this splice when I replaced the knock sensors. I hope to never have to R&R the intake manifold again, but I could now do so easier with the longer hose fitting. It certainly lets you know that the whole engine was installed with that vacuum line already plumbed when GM built the car. Not only do your hands not fit, but you can't get your eyeballs back there to see the hose or the MAP fitting.
