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Old 10-21-2014, 11:44 AM   #1
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Throttle body 'T" how many holes?

I was taking my '98 Boxster (5spd) throttle body apart and cleaning the idle control valve today to try to 'cure' a sometimes erratic hunting idle and noticed the rubber sleeves holding the T plenum connector had a small port on each side. the right was connected to a small tube, but the left had no such tube. What do you do with the small hole of the left rubber sleeve? Is this the right part for the left side or did previous owner used 2 rights ? Do I plug it ? Does it matter ?

Visible part # is PXO 416 410-1

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Old 10-21-2014, 07:32 PM   #2
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Right side is SAI and should lead to a check valve. No idea about left side. Can't just be open. That may be your very issue!
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Old 10-22-2014, 06:47 AM   #3
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Right side is SAI and should lead to a check valve. No idea about left side. Can't just be open. That may be your very issue!
Sorry what does SAI stand for ?
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Old 10-22-2014, 06:59 AM   #4
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Sorry what does SAI stand for ?
Secondary Air Injection. Start up feature that adds air with a small pump and reduces emissions.
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Old 10-22-2014, 07:00 AM   #5
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It should go to a rubber Tee. One end of the tee goes back to the vacuum canister and switch under the manifold tubes between cylinders 1 and 2. The other end goes to a switch between the manifold tubes at cylinder 4 and 5. This one also branches over to the air damper butterfly on the front cross over tube.
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Old 10-22-2014, 07:07 AM   #6
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Here is a photo from when I was rebuilding. I took this for someone else who had a similar problem. Note the White and Black check valve then tee.


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* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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