Very high idle

Tiny
AHONDANUT
  • MEMBER
  • HONDA ACCORD
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 <><
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Wednesday, July 18th, 2007 AT 8:56 PM

8 Replies

Tiny
BRUCE HUNT
  • EXPERT
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?
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Thursday, July 19th, 2007 AT 8:32 AM
Tiny
AHONDANUT
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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?
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Monday, July 23rd, 2007 AT 8:28 AM
Tiny
BRUCE HUNT
  • EXPERT
Move away from the carb and check the vacuum system. For instance, check PCV valve and the EGR valve.
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Monday, July 23rd, 2007 AT 1:23 PM
Tiny
AHONDANUT
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[quote="ahondanut"] OOPS
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Thursday, July 26th, 2007 AT 7:49 AM
Tiny
AHONDANUT
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Quote="ahondanut"][/quote]
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Thursday, July 26th, 2007 AT 10:37 AM
Tiny
BRUCE HUNT
  • EXPERT
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.
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Thursday, July 26th, 2007 AT 11:50 AM
Tiny
AHONDANUT
  • MEMBER
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 <><
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Tuesday, July 31st, 2007 AT 5:26 PM
Tiny
BRUCE HUNT
  • EXPERT
Diagrams for vacuum system are enroute via email.
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Wednesday, August 1st, 2007 AT 7:52 AM

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