Hey everyone!

A few months ago I crashed the front driver's side of my 1999 Acura TL into another car.
I'm just now trying to get it fixed (It has been parked since the accident, but I've started it a few times to keep the battery from draining.)

When the car has been started, the engine will "rev" and the needle on the tachometer will continuously go up and down. (0 rpm to about 1000-2000 rpm) It stays like this whether it is in park or drive, though I haven't tried driving it.

Also, there is no "check engine" or "maintenance req'd" indicator light on the dashboard.

Here is the YouTube link for the video of the sound and tachometer.

What is the problem?
Any thoughts would be appreciated. Thank you!

 

IAC Valve on the bottom of the throttle body, probably got stuck sitting for a while.

Try to clean it, see if it works, otherwise replace it

 

Yeah, check that as 666 said. If still "revving", check the coolant level in the rad. It may have been damaged during the wreck and now leaking. This can cause an erratic idle also.

 

100% you have a vacuum leak somewhere.

Good chance it's a stuck IACV, but check the engine bay for loose hoses around the throttle body and intake manifold.