So I just got a 92 prelude with a F22b DOHC. It idles high and I'm pretty sure it's because of the vac lines. But nothing I do is working. Its idles at 3k and If I unplug one of them the idle goes down to 2100 which is still too high. And I'm getting 5mpg. Could this be the TPS? Any input would help. I might take the car to King Motorsports because it's basically down the street but I don't want to pay a bunch of money for something that probably is an easy fix.

try turning the idle screw down first

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1995 Honda Prelude SE Turbo; 250whp, 275wtq @ 10psi Soldddd!!!
2000 Acura TL; DD
2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt
2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump

Where is the screw located?

on the throttle body. its got a slit in it for a flathead screwdriver

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1995 Honda Prelude SE Turbo; 250whp, 275wtq @ 10psi Soldddd!!!
2000 Acura TL; DD
2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt
2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump

^ agreed, that what i did today. I was idling at 3k. My Idle screw was so loose it just fell out when i open the door thing to tighten the screw.

if it still continues check the throttle body gasket

I would also check the dizzy timing. there are slots in it and it could be too far advanced. Hook it up to a timing light.

Threads old.

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Someone please help! I just bought a 92 prelude 4ws and it idles between 2k rpm-3k rpm bouncing back and forth just when the car is in neutral but if I'm driving it goes away. please if anyone has any ideas it would be much appreciated!

first make sure its not your rpm gauge,,,,open your switch whit out start your car should stay on 0 rpm,,,on my allways goes up to 1000 whit car off,,,

Im having the exact same problem with my lude any help is greatly greatly appreciated.

^ check idle problem thread

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Honda Prelude 1997 2.2 VTI

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