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98 Accord idles at 3900-4000!

Tiny
SPACENACHO
  • MEMBER
  • 2012 HONDA ACCORD
Hi,
I have a 98 accord with 245000 miles. When I start the car in idles fine for the first 5 minutes or so. Then when I hit the gas the car will idle between 3900 and 4000 rpm. Alternating back and forth between the two. If I tap the gas sometimes the car will back down to 3500 and maybe once it dropped to 2500. Also the temperature gauge doesn't move much but when I turn it off there is boiling coolant flowing back into the coolant resevoir.
Thanks
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Thursday, December 7th, 2006 AT 4:14 PM

3 Replies

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
That is way to high. Are you sure that the cable for the foot pedal is not sticking?
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Thursday, December 7th, 2006 AT 11:33 PM
Tiny
SPACENACHO
  • MEMBER
  • 2 POSTS
No, it's not sticking. Today I held the choke closed all the way and it did the same thing. It's acually jumping between 3750-4000 not 3900-4000 like I said earlier. But when it does it on its own the choke doesn't appear to close all the way.
There are two vacuum lines that go from some kind of valve or sensor just on the cold side of the thermostat up to the carberator. I don't know what it is but maybe if the thermostat is bad that is causing it?
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Friday, December 8th, 2006 AT 3:52 PM
Tiny
DUCK95
  • MEMBER
  • 2 POSTS
You said that you temp gauge isn't moving? A faulty coolant sensor will affect your idle. I would check/replace that first then make sure your thermostat is working. Also, there may be a FITV (fast idle thermal valve) and a IACV (idle air control valve) on your throttle body, these can become clogged, dirty, ect. Take them off and clean them. This will probably help.
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Wednesday, December 13th, 2006 AT 4:48 PM

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