Engine & Internal Chat about beefing up your engine's insides here.

up down idle

  #1  
Old 05-18-2007, 11:49 PM
Thread Starter
Join Date: May 2007
Location:
Posts: 30
Default up down idle

Hello, i just picked a 90 accord for 100 bucks. Not perfect but I like it. Anyways, I'm having a problem with the idle. It jumps between 1000, and 2500 RPM ( 1500 when warm ) in an up down up down up down fashion. Runs fine otherwise. I replaced the whole throttle body and that sensor mounted to it ( TPS? ) with one from the junkyard. No help. Anyone have any ideas? Im not too familiar with hondas yet.
 
  #2  
Old 05-18-2007, 11:50 PM
Thread Starter
Join Date: May 2007
Location:
Posts: 30
Default RE: up down idle

I should add that it throws the TPS and injector codes. But only SOMETIMES. Sometimes the SES light never comes on, even though it still idles bad.
 
  #3  
Old 05-19-2007, 08:13 AM
Join Date: Sep 2006
Location:
Posts: 141
Default RE: up down idle

Sounds like you have a vacuum leak... I gave an explanation of how I find them in another post but I suppose I can post it again. Take a small blow torch and open the gas but don't light it... then just run it by all the tubes with the engine on and if the engine starts revving higher when the gas is over a certain spot, you have a vacuum leak!
 
  #4  
Old 05-19-2007, 03:06 PM
Thread Starter
Join Date: May 2007
Location:
Posts: 30
Default RE: up down idle

Just tried that. No luck. Heres a video to better describe the problem...

http://smg.photobucket.com/albums/v6...nt=idle001.flv

???
 
  #5  
Old 05-20-2007, 12:39 AM
KevinAccord's Avatar
Been Around A Long Time Member
Join Date: Apr 2007
Location: Puerto Rico
Posts: 1,172
Default RE: up down idle

Check throttle... it might not be working too well (may need oiling)
 
  #6  
Old 05-20-2007, 12:42 AM
KevinAccord's Avatar
Been Around A Long Time Member
Join Date: Apr 2007
Location: Puerto Rico
Posts: 1,172
Default RE: up down idle

well, after seeing the video, i do believe that you are not getting as much oxygen into the engine as you should. look for a vacuum leak. use a tissue and rum it around the throttle (never let it go!) and check all the hoses. good luck!
 
  #7  
Old 05-20-2007, 06:32 PM
Thread Starter
Join Date: May 2007
Location:
Posts: 30
Default RE: up down idle

Ended up being air in the cooling system tricking the cold idle valve. Thanks all!
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
smitty.308
General Tech Help
12
05-13-2013 08:08 PM
DougMN
General Tech Help
5
10-15-2008 03:17 PM
jose310
General Tech Help
10
02-03-2008 04:31 PM
PeaceKeepr
General Tech Help
0
06-28-2007 01:08 PM
95 Accord EXR
General Tech Help
4
02-19-2007 08:13 PM


Thread Tools
Search this Thread
Quick Reply: up down idle


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.