I have a turbo integra that is tuned already and when it is cold..not necessarly cold outside but just a cold start the car surges between 2000-2500. Only when cold though..after about a minute idling the car runs normally at 1k rpm.

I have checked around the intake manifold for leaks and I have sprayed carb cleaner around in a attempt to find it but still no luck. Before it was tuned the intake manifold was changed from stock to a blox and it had a port on it blocked so there was no vacuum on the bottom hole inside of the throttle body.

That blockage is now clear and it runs but just idles when it is cold. What else could I try looking for besides vac leaks? The car drives great and the afrs are good and stay pretty much around 14.7-14.9

Thanks in advance.

 

you should check the iac valve on the manifold i had the same problem i cleaned it and it went away

 

^^^bump for IAC
This is really common. should be an easy fix.

 

I did clean it when I was putting the intake manifold on, but I will try it again and report.

Keep the ideas comming because I have a feeling this is not the source of the issue..

 

low coolant is an overlooked idle surge

 

Coolant is full..I cleaned out the IACV and same thing..

 

Check your FITV (Fast Idle Thermo Valve) it resides underneath the throttle body, it also has a coolant line or 2 running to it. You may want to check that also.

https://honda-tech.com/forums/honda-accord-1990-2002-2/cleaning-iacv-fitv-tb-1844067/

Here is the link for cleaning the FITV and the IACV. Hope this helps.

 

From what I have read I dont think my car has a FITV since it is 98+ but I will try taking out the throttle body and cleaning it. Maybe get a new gasket as well and see if it improves..

 

Im having the same problem i have a surging idle on cold starts but when the car warms up its fine...i have yet to clean the iacv, or the fitv, but i also noticed one of my hoses running to the IM (not sure if its coolant or a vacuum hose) but one is plugged by a screw because there is no place to connect it on the new IM, could that be my problem? and also maybe yours..