So as the title says I have been having rough idle(100-200rpms) at dead stops and most of the time the car dies. This has been happening throughout the year and it comes and goes, I usually notice that it happens on warm days after I vtec or sometimes just happens randomly on warm days. So far I have have cleaned the IAC valve(did this about 2-3 weeks ago), cleaned map sensor, maf sensor and have recalibrated the ecu a bunch of times but this dam rough idle keeps coming back and its starting to happen more frequently and its super annoying! I have an k&n fipk intake I have cleaned the filter but I think im gonna try and clean it again(maybe this will help?). Also when I was looking at my engine bay I found this around the head area, im not sure exactly where its coming from but it might be part of the problem? Or maybe another problem? lol


I know alot of people have had this problem if so if anyone can share their experience or if anyone knows my problem it would be GREATLY appreciated!

-Thanks

 

To start, we don't have a MAF (mass air flow) sensor, so IDK what you cleaned.

Any codes? Dirty filter could cause it, bad fuel injector, map sensor, iat sensor, iac valve. Data stream via a scan tool would work very well for this problem, but I don't expect you to have that at your disposal.

 

Oh sike well whatever sensor that is connected to my intake no codes though I acutally have cleaned iat sensor while cleaning my iac valve. I do have a scan tool but im not sure it has that data stream feature I only use it to check CEL's.

 

You must be talking about the IAT sensor on the intake. IAT is intake air temperature sensor. Although you cleaned those sensors and the valve, they could still be causing a problem.

Do you have a voltmeter?

 

Try the throttle coolant bypass. I did that on my car yesterday and my car doesn't drop under 1k at all anymore. You just block off two coolant lines going into your throttle body/intake manifold area with a couple 3/8 steel balls. This stops the hot coolant from entering and increasing your IAT


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I might have one

 

Do a valve adjustment, clean the throttle body and inspect plug gaps and read their condition. Hope it helps or solves it, good luck.