I'm really pleased with my 55 plated Peugeot 407 2.0 HDi SE saloon - it's quick and quiet and a great deal of car for the money. It even accelerates in 6th!
I paid less than £10K for a 12K mile example from Robins & Day. It was a Peugeot owned car.
However, spirited driving reveals a really annoying flat spot when engaging the next gear (i.e. 1st to 2nd) and the revs are about 1500. No power. Then, half a second later it's there (just) but it happens in every 'next' gear, every change to a higher gear.
Is it simply my driving style? Do I need to learn how to drive modern turbo-charged diesels or is there a problem with this model and its ECU mapping? Or is it just my car?
I have yet to confront the Peugeot dealer - that will be my next course of action but in the meantime - does anyone else have this problem?
An Internet search for '407 flat spot' only shows one thread in an Asian forum ...
I look forward to your comments and ideas - I had a great deal of help with a Civic steering problem acouple of years ago ....
Knd Regards
Hugh Milsom
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It does sound like yr driving style Hm... try changing up at slightly higher revs so that the next gear comes in at around 2,000.
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Take it to your Peugeot dealer, they will have seen 1 or 2 ( well lots ) of 407 HDI's with this problem.
Pretty sure there's been a TSB on this issue & a modification to one of the parts in the throttle butterfly as well.
Its under warranty so let Peugeot U.K. / PSA pick up the bill.
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Do you by any chance have a copy of that TSB?
Kind Regards
Hugh Milsom
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Sorry no, It was passed on to me by a Pug technician.
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Pretty sure there's been a TSB on this issue & a modification to one of the parts in the throttle butterfly as well.
On a diesel?!
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On a diesel?!
Yup; been on the commercials for years. 'Think that PSA call it a dozer valve; it's ECU vacuum controlled and covers both EGR and FAP regen functions.
Well prone to sticking and linkage issues too.
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>> On a diesel?! Yup; been on the commercials for years. 'Think that PSA call it a dozer valve; it's ECU vacuum controlled and covers both EGR and FAP regen functions. Well prone to sticking and linkage issues too.
Well I'll be danged. Everyday's a school day, as they say...
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Hi Hugh
Try some concentrated diesel injector cleaner 1st, peugeots are suffering from injector faults. Dont use low sulpher diesel fromsupermarkets and run the tank low before you add a cleaner, drive for 20 miles leave overnite then drive again then refill tank. There is a very effective product called DAE you can find on internet £12+vat a can seems to get rid of hesitations on diesels
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Spirited driving and changing up at 1500 don't go together.The engine should start to pull strongly at 1800-2200 rpm and too much pulling at very low rpm. is not good for dual mass flywheels(if it has one).
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Hey guys - thanks very much for such a great quantity and great variety of replies!
So, diesel injector cleaner first, then try a few more revs, let the Peugeot dealer have a go and don't use very low revs. Phew!
Actually, on my way home tonight I realise its at nearer 1500 - 1800 revs after changing into the next gear that gives me grief.
I'm very pleased with all the comments - again many thanks. I shall try these things and report back.
Kind Regards
Hugh Milsom
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My 2.2Hdi has 6 butterfly valves. 2 separate pipes feed air into the inlet manifold & each has a butterfly. 1 takes air direct from the intercooler, the other has a water to air heat exchanger, presumably to heat the inlet air perhaps to aid warm up & particle filter regeneration. Not butterfly valves in the sense used for a petrol engine, more of an on/off switch effect I think. Then there are 4 more in the head to add turbulence to the air going to each cylinder.
Nice simple diesel engine, not any more i'm afraid.
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Wynn's Diesel Nozzle Cleaner/Treatment added when tank filled.
Difference in smoothness and acceleration is marked - and that's after only 30 miles of use!
I'll use the tank up and assess the flat spot problem then.
Kind Regards
Hugh Milsom
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The diesel additive/cleaner appears to have done the trick.
Peugeot (Marshalls of Newbury) have checked the car out and can find nothing wrong - even comparing it to another 407 they had in stock.
Problem solved.
Many thanks to all who contibuted.
Kind Regards
Hugh Milsom
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Well i'm glad that you took my advice & tried the cleaner, there are those that ridicule what comes in a tin but then they must be living in the past. Not everything that comes in a tin works but diesel injector faults & cleaners mix quite well & well known to curing hesitations on very late HDI engines. I would advise that you use it every couple thousand miles and do give your engine a good burst, they do need driving & not poodling.
Thanks for the feed back & glad it saved you time & stress.
Regards Injdoc
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