Page 2 of 2 FirstFirst 12
Results 26 to 35 of 35

Thread: Idle Adjustment & Emissions Help, includes PCV and Black Box info

  1. #26

    Dr_Snooz's Avatar
    Join Date
    Jun 2007
    Vehicle
    1989 Accord LX-i
    Location
    Fresno, California
    Posts
    10,638

    Re: Idle Adjustment & Emissions Help

    You don't give a lot of extra information. The missing hose could cause a vacuum leak, which would definitely make it idle like poo. Start by blocking it off to see if that improves it.

    You mention high CO which sounds like you have recently had a state-mandated emissions inspection and failed. If that is the case, what state? If you have high CO while testing on a dyno at 15 or 25 mph, then don't bother with the idle mixture. It only controls the mixture at idle. As soon as you get going, it stops doing anything. High CO can be caused by a number of things, including a dirty carb. I would start with a tank of premium gas and a bottle of injector cleaner like Techron or the like. You can also buy carb cleaner in a spray can. Other potential causes include: dirty air filter, sticky choke, malfunctioning PCV, bad charcoal canister or a misadjusted carb (probably needing a complete rebuild). Good luck and keep us posted.
    Last edited by Dr_Snooz; 05-10-2011 at 08:33 AM.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

    Shop manual downloads available here: CLICK TO VIEW



  2. #27

    Re: Idle Adjustment & Emissions Help

    why am I credited with this writeup? This was all Mike's work..........
    Eric
    3geez member since October 12, 2000
    "All this worldly wisdom was once the unamiable heresy of some wise man." - Henry David Thoreau

  3. #28
    DX User Hennessy90032's Avatar
    Join Date
    Mar 2012
    Vehicle
    1988/Honda/Accord Dx
    Location
    Los Angeles
    Posts
    10

    Re: Idle Adjustment & Emissions Help

    My Car Idles At 2,000 - 3,000 Rpm And Wont Go Down.. Some times it idles Ok But It Has A Mind Of Its own... Is It The Carb Or Distributor Or ??? Any Advise...

  4. #29

    A20A1's Avatar
    Join Date
    Sep 2001
    Vehicle
    2006 Chevy Cobalt LS
    Location
    Kaneohe, Hawaii, United States
    Posts
    88,734

    Re: Idle Adjustment & Emissions Help

    When does it occur the most? When warming up or after the car is fully warm?
    - llia


  5. #30
    DX User JDAccord88's Avatar
    Join Date
    Jan 2013
    Vehicle
    1988 Honda Accord lx
    Location
    Georgia
    Posts
    13

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    mine has the same idle problem (2,000-3,000 rpms) sometimes right when i start it up and even if i have driven it all day. It just varies. Sometimes it wont act up at all.

  6. #31

    Dr_Snooz's Avatar
    Join Date
    Jun 2007
    Vehicle
    1989 Accord LX-i
    Location
    Fresno, California
    Posts
    10,638

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    Check your accelerator pedal linkage and the condition of the cable. Make sure the cable moves easily and is not binding.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

    Shop manual downloads available here: CLICK TO VIEW

  7. #32
    DX User
    Join Date
    Apr 2014
    Vehicle
    1989 Accord
    Location
    Charlotte NC
    Posts
    20

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    Ok idle issue here too.. stays around 2k even when warmed up. SPent hours last night pulling diagrams and reading. Reading this post something dawned on me and i would like to ask a question. I replaced the valve cover gasket but JUST remembered i didnt put the ground wire on the most right (looking towards the drivers seat from the outside) valve cover grommet. Could not putting this ground wire on cause my high idle?

  8. #33
    DX User
    Join Date
    Apr 2014
    Vehicle
    1989 Accord
    Location
    Charlotte NC
    Posts
    20

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    anyone have pics or specifics where to find thermovalve A and B? I think i can replace both cheaper than a diagnostic from a pro mechanic for my high 2000 rpm idle at all times. Choke is fine - stays open..... when hot... im not getting vacuum in #19 but i am slight in #18 on the unloader. According to the manual it says to check thermovalve B but everyone keeps saying A is bad... ,What gives?

  9. #34
    LX User
    Join Date
    Nov 2006
    Vehicle
    88 DX 5spd sedan 176Kmiles, 1 owner, stock. (Sold 10/18)
    Posts
    301

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    I wrote about the high idle unloader circuit here:

    https://www.3geez.com/forum/carb-tech...ml#post1148126

    ...BUT download the manual for your exact model! as I think some may be different here (ie thermovalve A vs B)
    Both A and B are back under the carb. There is a location diagram also in the manual. (Mine is CA 88 DX manual trans & uses thermovalve A) 18 & 19 are always for the high idle unloader; 18 drops 2000rpm, 19 drops 1500rpm high idle.

    If you are getting weak vac on line 18, you could still have a leak in the choke. Just not bad enough (yet) to keep the choke from fully opening. (That's how mine failed) Really best to have a vac gauge/pump in your toolbox. It will save you buying and replacing parts you don't need. Just unplug 18 from the carb and pump the line down to see if your idle drops. If so, the problem is likely choke opener vac leak.
    Last edited by g.frost; 04-07-2014 at 12:49 PM. Reason: spelling

  10. #35
    DX User
    Join Date
    May 2017
    Posts
    3

    Re: Idle Adjustment & Emissions Help, includes PCV and Black Box info

    Ok guys my 86 accord idles perfect when it's cold but as soon as it gets warm and the choke plate fully opens it sputters and dies also pulled the plugs and all were pretty black and cylinder 4 was white any tips?

    Sent from my SM-G930P using Tapatalk

Similar Threads

  1. Idle Speed Adjustment
    By DBMaster in forum EFI Tech
    Replies: 29
    Last Post: 07-30-2007, 03:56 PM
  2. need diagram for idle adjustment
    By fcov in forum Carburetor Tech
    Replies: 4
    Last Post: 07-27-2006, 04:08 PM
  3. wtf is the idle adjustment screw??????
    By Nospeed in forum EFI Tech
    Replies: 7
    Last Post: 04-21-2006, 05:41 PM
  4. Idle adjustment?
    By bigal004321 in forum 3geez Accords
    Replies: 9
    Last Post: 03-13-2006, 08:39 AM
  5. weber idle adjustment
    By 87AccordLXsdn in forum Carburetor Tech
    Replies: 7
    Last Post: 02-14-2006, 07:36 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.
     
Links monetized by VigLink