Rough idle on warm start.

[graynada]

Thanks for the reply, I will check again for vacuum leaks again. I have replaced the front pipe that goes not that long ago.

But I have run from cold while monitoring the lambdas and the idle is fine when open loop and then I have seen activity start on both lambdas, and before it gets to 'mid warm' and the idle is still fine also. So it does not seem related to either open or closed loop, however it only happens under closed loop at a certain temperature.

Originally Posted by ainarssems

You cannot discount them. While lambdas are warming up engine runs on open loop. Once lambdas warm up it runs on closed loop based on lambda feedback.

So if you have vacuum leak it might be running lean before lambdas kick in. If You have faulty maf it could be lean or rich before lambdas star working.
And if it is very lean lambdas might never start to show activity.

Check vacuum leaks first