KFU Engine idling at 1600rpm

[mick-the-fish]

Hi everyone,

I have a Peugeot 207 1.4 Semi-Auto with the KFU engine, and I’m experiencing an issue where it idles at around 1500–1600 RPM. I purchased the car with a gearbox problem, which initially prevented the engine from starting. Since then, I have replaced the clutch, clutch actuator, and serviced the vehicle, including replacing the cam belt. While the car now runs, but with a high idle

When I scanned the vehicle, the following error codes were recorded:

• P0170

• P0010

• P0012

• P0172

As soon as I start the engine, the only code that reappears after clearing them is P0010.

Additionally, I’ve replaced the following components without any improvement:

• Spark plugs

• Coil pack

• VVT inlet cam pulley

I’ve also inspected the purge valve and conducted a smoke test, which showed no issues.

My next steps are to replace the cam and crank sensors, as well as the throttle body. I’ve come across several threads discussing similar problems, but no solutions seem to have been effective.

This car is for my daughter, so any assistance would be greatly appreciated.

Thanks in advance

[mickthemaverick]

Hello and

I would suggest you change the sensors you mentioned and then come back with the results.

[RichardW]

Does the throttle pedal work? Sometimes if there is no, or incorrect signal, it defaults to a high idle (but you have no codes, so probably not).

What does the freeze frame / live data say behind the codes? Often codes for multiple items are related to loss of reference voltage or earth.

[mick-the-fish]

Hello and

I would suggest you change the sensors you mentioned and then come back with the results.

Hi and thank you. I have changed all the above today and still no change

[mick-the-fish]

Does the throttle pedal work? Sometimes if there is no, or incorrect signal, it defaults to a high idle (but you have no codes, so probably not).

What does the freeze frame / live data say behind the codes? Often codes for multiple items are related to loss of reference voltage or earth.

Hi,

I have now changed all the sensors and the throttle body, but it’s still the same. I have checked the throttle pedal and it all appears to be working as it should in live data. I have attached an image of the freeze frame data

[mickthemaverick]

The coolant temperature there is low, it should be up in the 80-90s when the engine is warmed up. so that may be affecting the ECU idle control.

[mick-the-fish]

It’s still the same when it’s up to temp.

[mickthemaverick]

Then that suggests the temperature sensor is sending the wrong info to the ECU. Measure the temperature of the thermostat housing and check it is showing 86+. If so then the sensor would appear to be faulty causing the ECU to maintain high revs at tickover. Replace the sensor!!

[mick-the-fish]

I replaced it today and it made no difference