Hi everyone,
I have a 2005 gti that has a rough idle. The rev counter doesn’t move at all, it sits at the same revs but it feels like it’s misfiring. Seems to get worse once the engine is warm. I have replaced coil packs, spark plugs, dv, n205 valve, cam follower, oil and filter, oil pick up pipe, air filter, main thermostat, in line thermostat and the coolant temp sensor. I know some of them shouldn’t cause a rough idle but they needed replacing anyway. The car drives sweet as a nut, pulls fine through every gear never stutters, misfires it’s lovely. It’s just sat on idle it is horrible it shakes the car slightly and also if you lift the bonnet and look at the engine you can see it judder every now and again like it’s misfiring, if I pull the dipstick out while it’s running it idle’s even worse so I don’t think it’s the pcv. I have no codes stored on the ecu now either. I did have a p000a code but the n205 valve seems to have cured that problem. The only thing I can think of is carbon build up on the intake valves because they don’t have any fuel going over them to keep them clean. Is there anything else I have missed before I set about cleaning the valves ? Any help would be appreciated. I’m trying to get the car remap ready. This is my last little issue now. Thanks 🤓