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I have a 2004 2.0 HD I 407 with a recurring issue my mechanic can't seem to get to the bottom of. After a short time driving the car begins to "chug" when pressing on the accelerator from a neutral position with a lovely puff of black smoke. The only way to stop it is to switch the car off then on again and that seems to stop it for another mile or 2s driving. Whenever this fault starts the car will Rev itself while idling and produce a lot of smoke.

I have a link here for a video of the exhaust while she's misbehaving.

https://m.youtube.com/watch?v=IE8hh29uCsg

Putting the car on the computer shows no faults whatsoever and to date I have changed the heater plugs and the high pressure fuel pump, both seemed to rectify the issue for a number of weeks bit then the problem returns.

Apologies for the long winded post but wanted to cover everything, any help would be greatly appreciated guys!
 

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Thanks for the reply. Had a glance over the rules and have attempted to PM someone with Peugeotplanet here in NI but I keep getting a "invalid thread" error. Also can't visit the "need 20 posts" thread as its been deleted, according to my phone.

Gibbo is there any particular reason you posted up the rules etc? I'm not mechanically minded so I didn't want to put too much info in the post in case I was talking garbage haha

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Thanks for the reply. Had a glance over the rules and have attempted to PM someone with Peugeotplanet here in NI but I keep getting a "invalid thread" error. Also can't visit the "need 20 posts" thread as its been deleted, according to my phone.

Gibbo is there any particular reason you posted up the rules etc? I'm not mechanically minded so I didn't want to put too much info in the post in case I was talking garbage haha

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go here
http://www.peugeotforums.com/forums/off-topic-3/need-20-posts-before-pm-72601/

post anything you wish until you reach 20 posts
 

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Gibbo is there any particular reason you posted up the rules etc?
FAQ item 8.

It also states in the Planet page that if one of the "20 posts" pages doesn't work to try the other:

I can't send PMs!

This is to prevent spammers harassing members. To get your PM privileges enabled you must have contributed 20 posts to the forum. If you don't want to needlessly comment on random posts, use the NEED 20 POSTS BEFORE PM thread.

If you can't post on that one, try this one instead.
 

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Discussion Starter #7
So I got the car onto a computer running the Diagbox software and its showing no faults.

Is there anyone out there who has an idea on what the issue may be?

Thanks

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Check this http://www.peugeotforums.com/forums/407-41/peugeot-407-2-0-hdi-2005-rhr-extreme-hiccups-while-regenerating-191082/
I had similar issue, actually it looks like it is the same, check vacuum hoses, if your car still has DPF my guess its doing regens very often and every time it does, one of vacuum valves are not opening thus starving engine of air.
On constant throttle it would start dropping revs and then sudden kick forward, and revs would jump if on idle, also no errors on lexia. Really painful in the city not too bad when it happens on the open road
 

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Check this http://www.peugeotforums.com/forums/407-41/peugeot-407-2-0-hdi-2005-rhr-extreme-hiccups-while-regenerating-191082/
I had similar issue, actually it looks like it is the same, check vacuum hoses, if your car still has DPF my guess its doing regens very often and every time it does, one of vacuum valves are not opening thus starving engine of air.
On constant throttle it would start dropping revs and then sudden kick forward, and revs would jump if on idle, also no errors on lexia. Really painful in the city not too bad when it happens on the open road
Thanks neecola, only the link is taking me to some thread about a bumper! I think the issue may be rectified now. Had an intermittent brake switch fault, have put a new switch in and she's running grand

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Discussion Starter #10
So 4 weeks later and right on queue the the fault has returned. Does anyone know if checking/fixing the vacuum valves a big job?

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Just pull the pipes off the throttlebodies on the inlet manifold and put something (whatever at hand that might do the job) into the rubber-pipe end to avoid them leaking.

Then drive with the pipes blocked and disconnected for another month and see if it returns. If it doesn't you have probably identified the fault....
 

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Discussion Starter #13
Thanks for the reply B1ack. Thing is at the minute I don't have to drive it for a month, 100 yards up the road and the hiccuping and idle revving starts.

What does blocking the pipes do? Is the Dpf able to regen OK with them blocked? Forgive me but I'm not mechanically minded at all

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They control the throttlebodies that control the intercooler by-pass functionality.

The intercooler is supposed to be by-passed during regen, but my car has no problems what so ever of doing successful regens so it ain't really a problem.

So if you unplug both vacum pipes from the throttle bodies one of them will stay constantly open, and the other one will stay closed. This way you will be sure that the engine is not starved for air.
 
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