Peugeot 306 engine problems

I had this exact problem on my old 1.4 306. Turned out the ECU had blown. Once that was replaced it worked perfectly for about a month. Then the new ECU blew. After which I changed the car. I've heard that blowing ECUs like this can be caused but a faulty coil pack.

ECU failure is very rare. More likely is that when the ECU was changed over it operated in the same way as an ECU reset. i.e. if you disconnect the battery it resets the ECU and upon reconnection and start-up the ECU goes through a 'learn-mode' changing settings to get the engine to work as best it can and then storing these settings.

I'd suspect a fuel injection system sensor to be at fault - do a google search in the pug newsgroup or get a cheapy diagnostic tester to read the fault codes out of the ECU.

The first ECU was reset before it was replaced. The reset made no difference. When the problems returned after the replacemement, it too was reset to no avail. Both ecus had no fault codes loged when the dignostic machine was connected up.

idle control valve / stepper motor £70 new old one can be cleaned first. very common fault. suprised not changed first

simon

It was. The ECU change was the last option on the list of possible solutions.