Pug 207

[fruitsalad]

When I first start it from cold it seems to run very lumpy and cuts out unless I keep my foot on the accelerator, when it warms up it seems to run fine although, it has stalled a couple of times slowing at junctions, I was told it may need a software update, done at a Peugeot dealership, I would of thought a 2007 would of been a bit old for that, any ideas please.

[bhg481]

Diesel or petrol?

[fruitsalad]

Petrol bhg its also been on a diagnostic machine and shown 'no faults'

[bhg481]

I was hoping it was a diesel and then I could have suggested glow-plugs.
It's 20 years now since I last owned a petrol car but "mucky plugs" was a favourite cause of lumpy running, as was the points. I suspect the diagnostic machine would have identified a faulty engine temperature sensor but engines have moved on so much since I last had problems that most of the things that gave problems back then have been made more robust so I can't think of any other suggestions offhand. Sorry.

[Hopkirk]

When I had similar problems with a Vauxhall it required a replacement coil pack

[ToraToraTora]

sounds like auto choke isn't working.

[tonyav]

Sounds like it needs a new idle control valve to me.

Looks like this
https://www.autodoc.co.uk/vdo/1737277?bing=1&utm_source=bing&utm_medium=cpc&msclkid=e24b3dbd5da711925535628170c47607

[fruitsalad]

Would any of these problems show up on the diagnostic machine?

[tonyav]

Unlikely unless the engine management light has been on.

[fruitsalad]

No engine management light has not been on.

[bhg481]

It's not necessary for the engine management light to come on before problems will show up on a diagnostic check. A couple of years ago at a routine service they commented that the diagnostic check had shown problems with one of the glow plugs since they know I keep the car in a garage they thought it wasn't worth doing anything about it. A year later another plug was also showing problems at the diagnostic check so I had them replaced. The engine management light never came on.

[tonyav]

This is a petrol engine though, different kettle of fish to a diesel.

[bhg481]

Yes, I was simply pointing out that a diagnostics machine can show up problems which don't cause the engine management light to come on.