Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > 4th Gen Honda Prelude

Thread Title
Did a vacuum test need help with results

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 10-21-2008, 04:35 PM
ididdy's Avatar
Gold Member
 
Join Date: Sep 2007
Location: WA state
Posts: 692
iTrader: (1)
ididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these parts
Send a message via Skype™ to ididdy
Icon5 Did a vacuum test need help with results

My vacuum at idle is normal (except for every 15 seconds or so when the rpm's would drop) but when I hit the throttle the vacuum goes to near nothing and slowly climbs back up to normal (with hesitation)
__________________
1992 Prelude si 4ws H22A swap
WingsWest Big Mouth Kit,Shaved Handles,
emblems, Stock si wheels atm, Tokico Blues,
Tein lowering springs, MSD Cap
and coil, NGK IRIDIUM IX Spark Plugs, NGK Wires,
6000K Hid's,5 speed swap, fidanza 8lb flywheel,
Walbro 190lph fuel pump, Vtec front brakes,
Powerstop drilled/slotted rotors,
Powerstop ceramic pads, 70mm OP Throttle body
Vibrant StreetPower Axleback

1993 Impreza
RIP 1990 Nissan 240SX Coupe w/redtop SR20DET
2007 Subaru Forester
1995 Ford Ranger
!990 Integra DA
1951 Ford Hardtop
Reply With Quote
  #2 (permalink)  
Old 10-21-2008, 04:50 PM
twokexlv6coupe's Avatar
little green ghouls, buddy!!
Photobucket
 
Join Date: Apr 2006
Location: kitten mittens
Posts: 17,844
iTrader: (9)
twokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond repute
Send a message via AIM to twokexlv6coupe
Re: Did a vacuum test need help with results

your rpm's shouldn't be dropping/bouncing at idle at all. sounds like you either have a vacuum leak, or somethings wrong with your FITV/IACV.


and vacuum is supposed to to decrease as you press the throttle, since it's negative pressure. there will be the most negative pressure when the throttle body is closed, and once you start opening it up, the neg pressure will decrease down to 0 @ WOT.
__________________

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


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
Reply With Quote
  #3 (permalink)  
Old 10-21-2008, 06:32 PM
ididdy's Avatar
Gold Member
 
Join Date: Sep 2007
Location: WA state
Posts: 692
iTrader: (1)
ididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these parts
Send a message via Skype™ to ididdy
Re: Did a vacuum test need help with results

Since a picture is worth a thousand words a video has to be worth atleast 2k right?


Here it is cold just started up notice jumpy idle.



Now after running for a couple mins notice it smooths out



This is hitting the throttle a bit

__________________
1992 Prelude si 4ws H22A swap
WingsWest Big Mouth Kit,Shaved Handles,
emblems, Stock si wheels atm, Tokico Blues,
Tein lowering springs, MSD Cap
and coil, NGK IRIDIUM IX Spark Plugs, NGK Wires,
6000K Hid's,5 speed swap, fidanza 8lb flywheel,
Walbro 190lph fuel pump, Vtec front brakes,
Powerstop drilled/slotted rotors,
Powerstop ceramic pads, 70mm OP Throttle body
Vibrant StreetPower Axleback

1993 Impreza
RIP 1990 Nissan 240SX Coupe w/redtop SR20DET
2007 Subaru Forester
1995 Ford Ranger
!990 Integra DA
1951 Ford Hardtop
Reply With Quote
  #4 (permalink)  
Old 10-21-2008, 06:47 PM
twokexlv6coupe's Avatar
little green ghouls, buddy!!
Photobucket
 
Join Date: Apr 2006
Location: kitten mittens
Posts: 17,844
iTrader: (9)
twokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond reputetwokexlv6coupe has a reputation beyond repute
Send a message via AIM to twokexlv6coupe
Re: Did a vacuum test need help with results

sounds like your FITV went bad. just do a quick search for "idle issues" and "FITV" and you'll find how to fix it.


everything else looks fine (aka, vacuum test). essentially what you're holding in your hand is a boost gauge. if you were turbo'd and REALLY rev'ed it up, the gauge would keep rising and start showing boost once the turbo started spooling.
__________________

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


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
Reply With Quote
  #5 (permalink)  
Old 10-22-2008, 01:03 AM
ididdy's Avatar
Gold Member
 
Join Date: Sep 2007
Location: WA state
Posts: 692
iTrader: (1)
ididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these partsididdy is infamous around these parts
Send a message via Skype™ to ididdy
Re: Did a vacuum test need help with results

Well I tested my FITV and it is wide open on start-up and slowly closes off as the engine heats up. I tried plugging the hole while the car wasnt all the way warmed up yet and I think it might have sounded a little better so when the car cools down I think I am going to do what this guy says http://92lude.com/idle_air_control_bypass_mod.htm and just flip the spring and clip but do you have to bypass the hoses if you go that route?
__________________
1992 Prelude si 4ws H22A swap
WingsWest Big Mouth Kit,Shaved Handles,
emblems, Stock si wheels atm, Tokico Blues,
Tein lowering springs, MSD Cap
and coil, NGK IRIDIUM IX Spark Plugs, NGK Wires,
6000K Hid's,5 speed swap, fidanza 8lb flywheel,
Walbro 190lph fuel pump, Vtec front brakes,
Powerstop drilled/slotted rotors,
Powerstop ceramic pads, 70mm OP Throttle body
Vibrant StreetPower Axleback

1993 Impreza
RIP 1990 Nissan 240SX Coupe w/redtop SR20DET
2007 Subaru Forester
1995 Ford Ranger
!990 Integra DA
1951 Ford Hardtop
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rob's Compression Test Results Rob 5th Gen Honda Prelude 8 09-26-2008 05:00 PM
Hmm compression test results... rheakpl 4th Gen Honda Prelude 9 04-16-2008 11:42 AM
Compression Test Results, What Could It Be? 2000 Prelude can I still run Nitrous? silverlude80 5th Gen Honda Prelude 9 11-17-2007 05:59 PM
New car, bad results InvaderTrax General Tech Talk 7 11-01-2007 09:43 AM
Need Help, Compression Test Results!! Constantine85 General Tech Talk 6 07-09-2007 09:55 PM


All times are GMT -4. The time now is 08:05 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.