CRX Performance Forums

Home of the CRX elders.
It is currently Thu Oct 23, 2014 1:55 am

All times are UTC - 7 hours [ DST ]




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Bouncy Idle
Posted: Sun Nov 01, 2009 6:16 pm 
Offline

Joined: Sun Jan 25, 2009 1:42 pm
Posts: 44
Car: 89 crx si d16a6/y8

So when cold the motor runs fine. When I drive it for about 30 minutes or so and come to a stop the idle will bounce from 1000 rpm to 1200 rpm and then fine. It bounces for like 1 min or so then goes away. I have cleaned the IACV, sprayed the tb and intake manifold and found no leaks. In the video you can see it bounce but when I rev the motor it goes away. I have a video linked which is kind of hard to see but you get the idea. Thanks!

Image


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Sun Nov 01, 2009 7:05 pm 
Offline

Joined: Wed Jun 06, 2007 11:28 pm
Posts: 1214
Location: In a state of Denial
clean your throttle plate?

_________________
Not so obvious and ruthlessly odd . . .

My quench is tighter than yours! :P

How To Tune OBD0 with TurboEdit

My fabrication blog.


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Sun Nov 01, 2009 7:44 pm 
Offline

Joined: Sun Jan 25, 2009 1:42 pm
Posts: 44
how does one do that Mr. Beaver?


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Mon Nov 02, 2009 4:33 pm 
Offline

Joined: Wed Jun 06, 2007 11:28 pm
Posts: 1214
Location: In a state of Denial
Take off your intake tube, get a roll of Bounty Paper towels, rip a couple of sheets off, fold them about 5 times, spray them with carb cleaner, hold your throttle plate open, clean the edges of the plate and the area of the TB where the plate closes against, put everything back together, start the car, and see if that helps.

_________________
Not so obvious and ruthlessly odd . . .

My quench is tighter than yours! :P

How To Tune OBD0 with TurboEdit

My fabrication blog.


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Tue Nov 03, 2009 7:52 pm 
Offline
User avatar

Joined: Sat May 31, 2003 10:07 pm
Posts: 1075
Location: Newark, DE
What ECU, intake manifold and throttle body are you using?

_________________
'Z6 powered '91 DX


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Tue Nov 03, 2009 8:40 pm 
Offline

Joined: Sun Jan 25, 2009 1:42 pm
Posts: 44
I am running a P28 ECU, Rywire OBd0-0bd1 conversion harness, 4 wire O2, A6 Intake Manifold, A6 Throttle body and injectors with injector resistor box. I bought a new TB Gasket and TPS Sensor and I am going to clean the TB like Mr. Beaver said. What you thinking?


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Tue Nov 03, 2009 9:18 pm 
Offline
User avatar

Joined: Sat May 31, 2003 10:07 pm
Posts: 1075
Location: Newark, DE
The P28 expects cold idle speed boost from a fast idle thermo-valve... The one you don't have. That's probably why it's idling fairly normal when the engine is cold. The problem shows up when the engine comes up to temp and the ECU expects the FITV to close, reducing idle speed. When the speed doesn't drop, it gets nervous. Have you tried simply turning down the idle speed? It's supposed to be 700-ish with the engine at operating temp and accessories off.

_________________
'Z6 powered '91 DX


Top
 Profile E-mail  
 
 Post subject: Re: Bouncy Idle
Posted: Wed Nov 04, 2009 5:43 am 
Offline

Joined: Sun Jan 25, 2009 1:42 pm
Posts: 44
I will try that as well bobski. Thanks for all the info. I will report back when I do it all this weekend.


Top
 Profile E-mail  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 7 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group