My g60 Corrado has 98,000 on it. i just did the following :
Im running a stock airbox with the K&N Drop in.
I had this problem prior to doing all of this work and i did all of these things because of mileage. When the car starts say first thing in the morning or when its been sitting a while, It idles really rough almost to the point of stalling. Also i can smell and see that the car is running really rich. Once the car warms up, it idles beautifully and drives good with no issues. Doesnt over heat or anything. I noticed that my supercharger is slightly leaking oil so i got a Rebuild kit that is on its way but this wouldnt cause a rough idle..
1. I noticed that when i unplug my ISV, nothing changes ( possibly a sign that the valve isnt working?)
2. I was going to pull my plugs to see which cylinder is running rich ( if any )
3. I replaced the vacuum line going to my FPR because it blew. Possibly damaged the FPR?
Like i said earlier once the car is at operating temperature it runs great. Could it be that something is keeping the engine at open loop?
These are the next things im going to check:
-Coolant Temp sensors
- Ignition Timing? although i dont see how this could change with the temperature.
- Vacuum lines
if anyone has any input on whats going on please let me know because this car runs great. i just want it to run great all the time especially with winter on its way.