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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

where does optispark vent hose go?

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Old May 11, 2008 | 02:12 PM
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Default where does optispark vent hose go?
i just recently ordered a 1LE elbow off ebay and it says "For 95-97, you must drill a small hole (1/8") for your optispark vent hose" and i want to make sure i know exactly what this is for when it arrives. if anyone could get pictures or anything to help out thatd be appreciated! thanks.
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Old May 11, 2008 | 02:20 PM
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or is this just the rubber hose that connects to it?
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Old May 11, 2008 | 04:56 PM
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not exactly sure what you are asking but its just saying you need to drill a small hole so you can plug the vent fitting into the elbow. had to do the same with my trickflow elbow
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Old May 11, 2008 | 05:09 PM
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it would help to know the yr of your car
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Old May 11, 2008 | 06:44 PM
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ahh wait a sec i think i know...
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Old May 11, 2008 | 06:44 PM
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it would just be that little like sensor that you plug the like...plug into lol?
Last edited by lt1noob; May 11, 2008 at 08:17 PM.
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Old May 11, 2008 | 08:17 PM
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the cars a 95
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Old May 11, 2008 | 08:25 PM
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Originally Posted by lt1noob
it would just be that little like sensor that you plug the like...plug into lol?
No, that's the intake air temperature (IAT) sensor, and that's NOT what this part is referring to.

The 1995+ Optispark distributor is 'vented' by engine vacuum. As such, there's an inlet and outlet vacuum hose to the optispark. The INLET hose is connected to the intake elbow before the throttle body, so that filtered/metered air is used to flush out the optispark.

This new elbow you're looking at doesn't have provisions for the 1995+ Optispark vent hose, so you simply need to poke a hole to accommodate it.

Make sense?
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Old May 11, 2008 | 09:13 PM
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yeah i figured was just making sure i knew exactly where this hole was being poked.
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Old May 11, 2008 | 09:57 PM
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bottom right of this picture is where it taps into the stock elbow:

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Old May 11, 2008 | 10:44 PM
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err...i dont have a hose going there. its just a hole....that might be my problem........
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Old May 11, 2008 | 10:51 PM
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yea i just took a peek, theres not a hose in site, just a hole...put a bit of duct tape over it because its just letting unfiltered air in. so what happens then if i dont have this optispark vacuum hose?
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Old May 11, 2008 | 10:57 PM
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damn i have a feeling this is just really not good at all...
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Old May 11, 2008 | 11:41 PM
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so any suggestions, what do i do now :S?
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Old May 11, 2008 | 11:46 PM
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any help would be really good...ill check back tomorow.
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Old May 12, 2008 | 12:43 AM
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get the hose, and then hook it up. The whole purpose of the vented opti revolves around that hose.
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Old May 12, 2008 | 04:44 AM
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Yes, find that hose that connects to the Opti, and install it! That hose will extend the life of the opti by far!!!!

-justin
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Old May 12, 2008 | 07:36 AM
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alright, ill look around and find a site to sell me it later today.
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Old Nov 3, 2013 | 08:03 PM
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Where does the other vacuum hose go on the intake? It it the one right next to the fuel pressure regulator on the manifold?
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Old Nov 3, 2013 | 09:15 PM
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Originally Posted by camaro.Q
Where does the other vacuum hose go on the intake? It it the one right next to the fuel pressure regulator on the manifold?
For the opti? No.

http://shbox.com/1/opti_vacuum_conn.jpg
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