Hope someone here can help me with this. I have a 2000 Honda Accord LX sedan with 99,600 miles.

On my way to work today (in about 25 degree weather), my car began to idle funny at stop lights. Engine sounded different and when I released the brake the car wanted to jump forward. When I finally parked the car, the tachometer would rev between 1000 and 2000 rpm continually (would drop down to 1000 then bounce up to 2000 and repeat the process).

I am hoping that someone here has an idea as to what is causing the problem and maybe what the cost would be to fix it if I brought it into a shop.

Thanks.

92Wahoo

 

What engine???

For the 4-cyl, the IAC valve is bolted to the backside of the intake manifold. It could need cleaning. The throttle body could need cleaning.

This might even be caused by air bubbles in the cooling system. On a 4-cyl there's a bleed valve back on the thermostat housing.

For the V-6 engine it may be sorta similar... ?

 

Sorry about not giving the engine info. I have the 4 cyl. engine.

92Wahoo

 

As you search for posts about the IACV, you'll also find stuff about cleaning the FIT valve. Your car doesn't have one of those... (it disappeared in 1998)

Search also for "BASE idle".