"user498" wrote: > My 2 litre 406 GTX auto has just started to idle rough. Its > also lumpy at a > cruise speed, ie with little throttle. If I floor the pedal it > clears until > i back off to cruise again. It will drive like that for about > a mile then > that nice little engine light comes on in the dash and it runs > smooth. > Any clues? Mal
Hi, There should be a fault code entered into the ECU following the engine light illumination, so a read of the codes should give you a start. However the list is long of all the possible cures. The first reply from Peugeot dealers will probably be to replace the coils assy , whether it needs it or not, and if they do it iwill set you back £220 for parts and labour!
If you fancy DIY the following list is taken from the link below
Cuts out Misses:- Check Secondary Ignition System Check Fuel Pressure Check IAC Motor Operation Check The Minimum Idle Air Flow Check EGR System Check For Oxygen Sensor Switching Check PCM Power And Ground Circuits
Hesitation:- Check Secondary Ignition System Check Engine Vacuum Check Fuel Pressure Check ECT Sensor Calibration Check TPS Calibration Check MAP Sensor Calibration Check IAT Sensor Check IAC Motor Operation Check The Minimum Idle Air Flow Check EVAP Emission System Check EGR System Check For Oxygen Sensor Switching Check O2 Sensor Heater Check PNP Switch Check PCM Power And Ground Circuits
Most results seem to be got from changing coils and cleaning/replacing IAC motor (idle control valve)
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