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Old 04-27-2014, 09:55 PM
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Vacuum Line Question

Hi guys,
I'm new to the forum. I just bought a 2001 Honda Prelude Type SH. I'm having problems with the idle surging when the car is warmed up. I noticed on my car that on the Intake manifold next to the throttle body, there are 3 nipples for vacuum hoses. The leftmost nipple is capped off since the Intake Control Solenoid valve was removed. The rightmost nipple leads to the cruise control, but what about the center nipple? Is there a vacuum line that is supposed to be connected there? I think that might be the cause of the surging idle. I've included a photo.
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Old 04-27-2014, 10:10 PM
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Re: Vacuum Line Question

If there is an open nipple - cap it.


One goes to the intake valve as you mentioned, the other to the cruise control, and the third is usually capped.
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Old 04-29-2014, 10:46 AM
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Re: Vacuum Line Question

my car had a surging idle 1000-1500rpm. The cause was that one of those nipples werent capped.
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Old 04-29-2014, 04:51 PM
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Re: Vacuum Line Question

Small segment of hose can be 'looped' over the un used nipples if you don't want to use caps. You can probably cut 2" off your cc hose for that. My 97 has a longer hose than need be. So I'm supposing your 01does as well.

Yes that open nipple will cause a surge when the car settles down into warm mode.
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Old 04-30-2014, 10:59 PM
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Re: Vacuum Line Question

Thanks guys, I had a vacuum line connected in the middle nipple of the intake manifold. It wasnt connected to anything, so I removed and capped it. I was just confused why I had that extra one connected.
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