Hi there,
the first time the revs would go crazy on idle they would race as though the throttle has been stepped on. I changed the step motor (idle speed controller) and all four injectors the problem disappeared and a new problem came up the rev counter moved anticlock wise and would fluctuate between 7000 rpm to 5000 rpm instead of between 0 - 800 rpm on idle.
The car would go dead slow at u turns, junctions, red lights and on hills though the engine would be running i had to step on the throttle hard and the car would pick speed.
I then replaced the plugs, air filter and cleaned the butterfly unit the fuel is still burning rich and the car has a slight change does not go dead slow all the time just when the engine is cold. I have noticed that there is a slight miss its as though the exhaust is kind of coughing. I put some fuel treatment that when the car started throwing out water from exhaust on first start and on idle.
The peugeot 206 has a ecu system but when put on diagnose the only thing it shows is rich fuel mixture and fluctuating rev counts no other fault codes.
If i can figure out how to adjsut the idle it would be great. The car has covered 50,000km.
Thanks