What go's in this hole.....?
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Joined: Jun 2007
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From: Humble,Texas
Car: 91 CAMARO Z28
Engine: 5.8L TPI 355 L98
Transmission: 700R4
Axle/Gears: 3.23
What go's in this hole.....?
This is on the right side of the runners. i can't figure out whats soposed to be there.
Joined: Mar 2007
Posts: 1,698
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From: NE Pennsylvania
Car: 85 Iroc-Z
Engine: 383 TPI Procharger D1SC
Transmission: TKO600
Axle/Gears: Strange S60 3.73
Re: What go's in this hole.....?
Looks to be where your cold start injector goes.
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From: Chicago
Car: 1989 Camaro IROC-Z
Engine: L98 350 TPI
Transmission: Built TH-700 R4 (Vilgilante 2800)
Axle/Gears: 9 bolt w/ PBR's
Re: What go's in this hole.....?
Joined: Oct 2001
Posts: 646
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From: Sedalia, MO
Car: 1991 Z28 convertible
Engine: 305 TPI
Transmission: TH-700R4
Axle/Gears: 3.73 posi 4th gen 10-bolt
Re: What go's in this hole.....?
That's a threaded hole for a vacuum fitting...for a MAP sensor. There is also another one that provides vacuum for the flappers in the a/c system and the cruise control.
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: What go's in this hole.....?
If I am looking at the picture right thats the RH rear of the plenum. IIRC I want to think there are two holes back there, one hooks to the HVAC & accessories like Cruise Control. system another hooks to the EGR, and another should hook to the Fuel Pressure regulator. Its been a few months since I have looked at them so thats from memory.
John
John
Re: What go's in this hole.....?
There are three vacuum fittings on the map cars. As mentioned already, they're identical to MAF cars, except there's a third nipple for the MAP sensor hook up. The other two are for the fuel pressure regulator, and the vacuum line to the HVAC system.
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Joined: Jul 1999
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From: Woodlands, MB, Canada
Car: 1990 GTA
Engine: 5.7
Transmission: 4L60
Axle/Gears: 3.27 Posi
Re: What go's in this hole.....?
FWIW, I replaced my intake manifold gasket last year and took a bunch of photos of the top end to use as a reference to make sure everything got back together OK.
Like IROCZ28KevinZ says, it's a simple fitting that a vacuum line attaches to. Here's a shot of my '90 L98.
Like IROCZ28KevinZ says, it's a simple fitting that a vacuum line attaches to. Here's a shot of my '90 L98.
Last edited by GTA Jim; Apr 23, 2008 at 08:16 AM.
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Joined: Sep 2006
Posts: 108
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From: Biloxi, MS
Car: 1992 Firebird Trans Am GTA
Engine: LS1
Transmission: T56
Re: What go's in this hole.....?
This isn't directly related but what is the valve at the end of that vacuum hose called? I'm replacing my vacuum lines soon and I have no idea what it's called to get a new one. Thanks!
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From: Toronto CANADA - GM Parts Rep.
Car: 1987 Iroc Z28
Engine: The KING of the 3rd gen TPI's.
Transmission: Beefed up T5
Axle/Gears: Aussie 3.45's
Re: What go's in this hole.....?
Yes that is a MAP sensor up on top. For your '91 L98 part# is 12569240.
I believe the piece you need is an intake manifold vac fitting (1 port - 1/4-18 THD). Part# is 14082470.
There's plenty of them in the GM warehouse. Order at your local dealer (but make sure this is what you need).
I believe the piece you need is an intake manifold vac fitting (1 port - 1/4-18 THD). Part# is 14082470.
There's plenty of them in the GM warehouse. Order at your local dealer (but make sure this is what you need).
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