I replaced the radiator fan motor today and ever since the idle has been either surging or constant between 1k &2k. Before it was solid at like 700. I have no idea what they have to do with eachother. I tried resetting the ecu by undoing the battery for a few minutes, but that didn't do anything. Do I need to have the battery undone for a specific amount of time to reset the ecu? Other than that what can I do about this?

 

If you leaked out all the coolant like you said you were going to do, then when you were refilling it with coolant you probably put air into your cooling system.. Air in the coolant will cause shitty idle.. Burp the radiator by taking off the cap and letting it run for a minute, open the throttle and watch bubbles come up in the radiator. WHen it has sat like that for a minute or two, put the cap back on and let it keep running. Turn off the car and come back to it in a couple minutes and start it up. Hopefully that fixes your problem.

 

Good call, thanks. It is doing better but still idleing higher. I'll try doing it some more.

 

On my d16z6 there is a small nut on the top radiator line from the block to the radiator that you can break loose to bleed it as well.