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Old 09-12-15, 10:03 PM   #1
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Default 207 Hdi rough idle and cutting out.

207 1.4 Hdi 2009.
Please, can anyone help with a little differential diagnosis.
Symptoms: Engine cuts out at low revs; junctions, lights etc and idles really rough 'some' of the time. If it cuts out it's difficult to start but while it's running it runs really smoothly and has no problems with acceleration or cruising. There are no warnings or faults flashing up on the display...
I've tried running some injector cleaner through it, no joy. Disconnected the MAF sensor ( which made a difference on a similar vehicle I used to own ) no joy.
I'm supposed to be driving to the south of France in 9 days and it being Christmas can only afford to fix the fault rather than have a garage replace all the things that 'might' be the cause.
Help would be very, very much appreciated
E2a: This only seems to happen when the engine has reached normal running temperature.

Last edited by No1Skelly; 09-12-15 at 10:37 PM.
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Old 09-12-15, 11:06 PM   #2
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I suggest it's the Idle Air Control Valve.
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Old 09-12-15, 11:17 PM   #3
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Love the suggestion, but can't find any reference to the location or where to buy a new one specific to my engine... I'm not hoping someone will do all the work for me but I honestly can't find it in relation to my model.
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Old 10-12-15, 08:25 AM   #4
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It's a diesel, diesels are unthrottled so don't have an IAC valve. Chances are the issue is going to be one of three things. Check for any vacuum leak on any of the air intake pipes, if they're OK check the egr valve, could be stuck open a clean with wd40 will sort this temporarily. Of the egr is OK it's probably an air leak into the fuel line below the airbox, it rubs slightly on the 1.4 and eventually causes a tiny hole
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Old 10-12-15, 08:30 AM   #5
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Needs a proper diagnostic to find what's wrong:

https://www.peugeotforums.com/forums/...gnostic-28190/


https://www.peugeotforums.com/forums/...70/#post529130
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Old 10-12-15, 08:52 AM   #6
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Thanks Gibbo, I've taken those steps while persuing all routes as I'm in a bit of a pickle.
Joe336, the egr route is where I'm headed today... I don't think it'll be the fuel line as that was replaced less than a year ago. I haven't seen/heard any air leaks and the failure seems to be when the engine is proper hot rather than at urban running hot. I shall report on today's success/failure if this doesn't hit the spot. Thanks for the advice :-)
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Old 10-12-15, 08:59 AM   #7
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Yeah the vacuum leak is unlikely but still worth a check, I would still check the fuel lines too as if they were installed incorrectly they could have worn through more quickly plus the priming bulb can be a culprit for this as well if you have one fitted. If you clean the egr valve and it sorts the problem is look at blanking it off of I were you (in fact I'd do that anyway)
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Old 10-12-15, 09:34 AM   #8
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Interesting. What does blanking it off do ? I've seen this mentioned in many posts and plates available on Ebay etc but not really sure what the effect is...
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Old 10-12-15, 09:43 AM   #9
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Essentially it blocks the gas from re entering the air that goes into the cylinder. As it doesn't burn it is just taking up space in there when the valve opens, meaning the diesel isn't burning as hot which means it burns less efficiently. But the biggest gain is it prevents soot from entering which contaminates the oil.
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Old 10-12-15, 12:13 PM   #10
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There's a visable groove in the top which seems to be making it stick. Waiting for a part now... Fingers crossed.
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