2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Intake tube from throttle body to maf

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Old Nov 7, 2017 | 03:08 PM
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Intake tube from throttle body to maf

There are two vacuum lines coming from the bottom of the intake tube, one goes to the back of the throttle body area, where does the other one go and can someone please up load a picture.
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Old Nov 7, 2017 | 05:35 PM
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Neither of those are vacuum lines, they are both metered air feeds.
One feeds the OMP injectors, the other feeds the BAC and AWS.
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Old Nov 7, 2017 | 08:12 PM
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[QUOTE=clokker;12230275]Neither of those are vacuum lines, they are both metered air feeds.
One feeds the OMP injectors, the other feeds the BAC and AWS.[/QUOTE

I have one that is still hooked up and the other one has been capoed off. I was just trying to figure out exactly where it goes to make it right.
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Old Nov 7, 2017 | 08:19 PM
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the second one is capped off, the OMP injectors get air from the UIM via the phenolic spacer by the throttle body on both turbo and non turbo models. i assume the capped smaller line is for some non USDM market cars.

Last edited by insightful; Nov 7, 2017 at 09:51 PM.
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Old Nov 7, 2017 | 08:46 PM
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Originally Posted by insightful
the second one is capped off, the OMP injectors get air from the UIM via the phenolic spacer by the throttle body on both turbo and non turbo models. only the S5 has 2 ports, i assume the capped smaller line is for some non USDM market cars.
This is what I was talking about I wasn't sure if it was important for this to be hooked up somewhere.

As you can see the smaller one is capped, both of them come off the bottom of the intake tube. The car does run fine no issues just wanted to know if it needed to go somewhere.
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Old Nov 7, 2017 | 08:50 PM
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This is what I am not talking about. And I thought one of these lines is what fed the OMP injectors.
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Old Nov 7, 2017 | 09:39 PM
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yes, that is all correct, i was merely correcting clokker. the fat line on top in the second picture feeds the oil metering nozzles.
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Old Nov 9, 2017 | 06:57 AM
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My description is exactly correct for a S5 NA.
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Old Nov 10, 2017 | 07:43 AM
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So I do not need to worry about the capped tube on the bottom of the intake tube?
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