Go Back   Honda-Tech > Honda and Acura Model-Specific Technical Forums > Honda Prelude
Sign in using an external account
Register Forgot Password?
Search


Welcome to Honda-Tech!
Welcome to Honda-Tech.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread
Old 12-01-2011, 09:02 AM   #1
ZAchAtTacK420
Trial User
Garage is empty, add now
 
Join Date: Oct 2011
Location: Phelan, Ca
Posts: 1
iTrader Rating: (0)
Default 93 H23 Prelude Idle Jump/Surge

I have a 1993 Honda Prelude with an H23 and a 5-speed. I've been having a problem with a the idle jumping for about 2 months now. It'll go from about 1500 to 2100 after about 3 minutes from startup and continue pretty much the entire time I'm driving it whenever the clutch is pushed down or it's in neutral. The car doesn't run any differently when it's moving and you're on the throttle. When you're in gear and off the gas, it'll sort of drive itself if the idle has been jumping. The only mods are an AEM cold air intake, K&N Cone Filter and a catback exhaust. I have no check engine light.

I've already taken off and cleaned my IACV and that kinda helped it for a day. I took it to the local mechanic when it started surging again like a mad man. He charged me for one hour of labor saying it was a ground wire to the IACV. It idled really low like 500 rpm and was close to stalling after he "worked" on it. Then my car started surging again 2 hours after leaving. Same problem. Nothing fixed.

I know I could bleed air from the coolant, but my buddy said that if the car isn't overheating, then there isn't air in the system. It rarely heats up to halfway and goes back down really fast. Someone told me to replace the spark plugs. I did. Made the motor run "smoother", but still surge...

If I have been driving for a prolonged period of time, the jump will stop, or drop to about 1000-1400.

There's two vacuum lines on the throttle body. Here's a pic I got off Google (not my engine and you can't exactly see where the lines are, but the general area)

Click the image to open in full size.

#2 doesn't go anywhere. The line looks like it was cut off. If you disconnect #1 when it's surging, it'll stop surging, but the idle becomes very rough. I'll try to get a better picture later of my engine bay and actual vacuum lines I am referring to.

I keep hearing vacuum leak, or even exhaust leak from everyone I ask. I'm new to Honda cars and so far I've found a laundry list of problems that could cause this from doing Google and forum searches, so I'm sorry if this has been asked before and numerous times. I just need someone point me in the right direction. Thanks in advance.
ZAchAtTacK420 is offline   Reply With Quote
Old 12-01-2011, 11:51 AM   #2
typemismatch
Honda owns me
Garage is empty, add now
 
typemismatch's Avatar
 
Join Date: Sep 2004
Location: Fargo, ND, USA
Posts: 991
iTrader Rating: (0)
Default Re: 93 H23 Prelude Idle Jump/Surge

#searchfeature

/thread
__________________
1992 Prelude S - 469hp/340tq@15psi - 12.46@117mph
2007 Civic Si - FG2 - almost stock (DD)
92 EG H2B - build thread http://www.honda-tech.com/showthread.php?t=2944704
typemismatch is offline   Reply With Quote
 
 
 
submit to reddit
Reply

Tags
1993, 93, adjustment, bleed, coolant, diagram, engine, h23, h23a, honda, idle, idling, prelude, prulude, surge, surging, system

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump



All times are GMT -8. The time now is 04:03 AM.



2008 Copyright, InternetBrands Inc.
Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Honda-Tech.com content, comments, or advertising. Honda-Tech.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Honda-Tech.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Emails & Contact Details