Thank's for the reply,I'll try a new temp.sensor.
Have changed the rpm and timing sensors and the lamda sonde.But it didn't help,the cat light was / is still flashing.
The light starts to blink same second I start the engine.
Even if the engine is cold.
Do not think the catalytic converters can be overheating
in 5 seconds.So I will change the temp sensor and see
what happens.
Thank's again,,