I have a 99 Accord 4cyl 5-speed. I am having the infamous honda idle surging issues. Back story: driving down the freeway one night and started losing lights then eventually everything and left stranded on road. Took alternator in and tested fine, battery tested bad so replaced that! Now i have the battery, doors open and brake light illuminated, as well as thw idle surge from 1100-1800 while in neutral. Replaced IACV, cleaned throttle body, and intake port, pulled ECU fuse to reset. Idles fine after reseting until i put it in gear to drive and surge returns... Please Help!!!!

I have topped off and bled the coolant system per another thread i had read, reset ECU fuse and still have the surging idle.

Only check engine light that has ever come on had to do with the IACV, which i replaced.

Still stumped and not wanting to take it to a shop. I have sprayed and checked for vacuum leaks and no results.

Any other ideas?

i will try that and update, thanks!

So update.... the IACV seems to be opening up and fixing itself, just need to drive it more. Drive it around and when i park the idle surges two or three times and then settles down to a normal idle. Still not where i want it to be, considering i have to smog it this month. Ive adjusted the idle screw to try and level out the idle nice and smooth, beat idle i have after adjustment is about 1000-1100, sound about right?

Will start another thread on this separate question, but throwing it out in here because it started once i started having this idle issue. So my doors open, battery, and brake lights are staying illuminated on the dash all the time. Any ideas of how to fix it?

JimBlake, I actually attempted resetting and re-learning the idle from your post, and no luck. Now that it is running a little better, i may try again


Update****
Did re-learn idle process with no luck, surge is back. Kind of frustrated now, guess im gonna have to go get the $168 IACV and start there...