very high idle

HONDA ACCORD
Avatar
AHONDANUT
  • MEMBER
  • 13 POSTS
I have a 1989 Honda Accord DX (2bbl carb.) 2.0ltr. 4 cyl.auto transaxel(180000+ mi). The problem I am experiencing is as follows. whan car is first started idle is a little high(1500-2000 RPMs). I figure this is to the choke is in cold start position. After engine warms the idle gets excessive sometimes as much as 4000 RPMs (scary). When engine is under load (in gear) the car woukd basialy drive its self with out any throttle`pressed. I've checked all the vacume hoses as best I can and can't find any broken hoses or mis-matched numbers. My haynes repair manual isn't much help considering it only covers very basic idle diagnostic info. I'm in no position to be able to afford a mechanic (God forbid the dealership) If I could only get a point in the right direction I would be very gratefull..

Thanks in advance
PEACE <><
Jul 18, 2007 at 1:56 PM
Avatar
BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
Is this equipped with an electric choke? If so, consider unplugging it once the car is warmed up. This might be a choke hanging. Can you watch as the vehicle warms if the choke unloads and disengages?
Jul 19, 2007 at 1:32 AM
Avatar
AHONDANUT
  • MEMBER
  • 13 POSTS
Thank you for your reply. I did as you recomended, I believe that this car is equiped with an electric choke. I found a single (power ?) wire attached to the choke mechanisim, however I could not figure out where to disconect it?? When the car is 1st started the choke is in the almost closed position, then as the engine starts to warm up the choke begins to open, and the idle starts racing?? WIERD... If I physically manipulate the choke (linkage) closed the idle reduces but it smells like it's running rich. The idle screw for all intensive purposes is disengaged (backed all the way off) but after i close the choke to reduce the idle the idle will slowly creep up. If I tap(gun it) the gas pedal to try to get the idle to drop the idle icreases almost like the throttle is sticking???
Jul 23, 2007 at 1:28 AM
Avatar
BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
Move away from the carb and check the vacuum system. For instance, check PCV valve and the EGR valve.
Jul 23, 2007 at 6:23 AM
Avatar
AHONDANUT
  • MEMBER
  • 13 POSTS
[quote="ahondanut"] OOPS
Jul 26, 2007 at 12:49 AM
Avatar
AHONDANUT
  • MEMBER
  • 13 POSTS
quote="ahondanut"][quote:a6dfa0a83c="ahondanut"]Thank you for your reply. Ok I think we're getting closer. When I disconected the vacume hose from the EGR valve and manually engage (open) the valve the idle is rough when cold and acceptable when warmed up,although still a little high it's much improved ;-) When I reattach the vacume hose the EGR barely reacts. The valve seems to move freely but I have not compared it to a new one which I intend to do to check the difference. It seems to me the vacume to the EGR is weak but I don't have a vacume gauge or hand pump as of yet. Do you think the dashpot valve could be bad?? For some reason I could not locate the PCV valve?? There does not seem to be a place to install one unless I place it in the hose connecting the valve cover to the air breather, both of which are male ends. Is the PCV valve essential?? [/quote:a6dfa0a83c][/quote]
Jul 26, 2007 at 3:37 AM
Avatar
BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
It should be on a line from the valve cover. I hope the article I am sending you helps out. I am emailing it to you.
Jul 26, 2007 at 4:50 AM
Avatar
AHONDANUT
  • MEMBER
  • 13 POSTS
Thank you soooo much for the valuble info that you sent me.. As soon as I can afford it I definatly sending you something ;-) Is there any way you can send a vacume diagram?? the one under the hood is quite ragged out. Anything you could do would be greatly appriciated..

Thanks in advance
PEACE <><
Jul 31, 2007 at 10:26 AM
Avatar
BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
Diagrams for vacuum system are enroute via email.
Aug 1, 2007 at 12:52 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle