136 hdi dpf

[tuttyboy84]

I think my dpf might be part blocked will my car go into limp mode if i drill a 2 inch hole through the dpf? Also does anyne know where the egr plug is on these engines? As always id be very grateful for your replys

[Danny Wideboy]

Try asking in a technical section of the forum for an answer. The couch is for general chat.
Informed questions generally get informed responses also.

[tuttyboy84]

Is there away of moving this post or should i just start a new one?

[Danny Wideboy]

Mods will probably move it at some point soon.
I don't think you can move it yourself.

[Ruan]

I would suspect it will seriously dislike a 2" hole drilled in the DPF, I don't know what would happen to forced regens if you do this. If it's part blocked, take it for a good long drive and keep the revs above 2000rpm or so.

Don't unplug the EGR valve, it will throw a fault code if you do.

[tuttyboy84]

I may be barking up the wrong tree with the dpf tbh i drive between 400 and 600 mile a week in the car and it drives fine but for the first 20 mins of driving there is a funny vibration and sound that i would say is from the exhaust so my thinking was the dpf may be part blocked but flows better once its really hot?  Or the egr valve but tbh its just a guess

[tuttyboy84]

I also will only unplug the egr to see if it stops the vibration and noise the plug it back in

[Redordead89]

Is this on a 307? I have a 307 110 Hdi with dpf issues too, is your car in limp mode? Eg limited to 2500-2700 revs? If so if you unplug the MAF you should be able to give it 3k+ revs up the motorway in 4th to try clearing it out! This will throw up a fault too possibly but will likely clear once you plug in the maf again!

[tuttyboy84]

It is a 307 but the 136 hdi and its not in limp mode it drives fine but this strange sound vibration for the first 20 minutes or so of driving, im clutching at straws really if im honest i

[Redordead89]

Try it with the maf unplugged to see if it still does it!?!?!?

[tuttyboy84]

I dont see how the maf would cause what feelz like back pressure on the turbo?

[Poodle]

If your dpf was blocked the car would be noticeably down on power and most likely throw an eml. I take it the noise is coming from the front of the car since you think it's a dpf issue..?

As you say it's only an issue for the first twenty minutes i'd be looking at items related to the warm-up cycle - glow plug relay, for example.

[tuttyboy84]

Its a oscillating vibration when crusing at low ish revs but when accelerating it stops it almost sounds feels like when you slow down using the gears if that makes sense

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And yes poodle it comes from the front of the car

[Redordead89]

Gearbox or diff perhaps before it's warmed up?

I dont see how the maf would cause what feelz like back pressure on the turbo?

I'm not saying the maf would cause this noise/ vibration! Unplugging it causes it to behave normally and cuts out certain readings going to the ecu when it's in limp thus allowing you to run a higher rev to clear the dpf thasall!
I've been running my 307 for over a year with issues and have dealt with a few bugs and found a couple of ways around issues so was just a suggestion for you to try!

[tuttyboy84]

Sorry if it came across rude i didnt mean to and i will by all means try it

[Redordead89]

Np

[Poodle]

What do you mean it sounds like slowing down in gear, does it make a noise while slowing down in gear then? Because it shouldn't... If that's the case it's probably a knackered diff, as redordead suggests.

[tuttyboy84]

Maybe ive explained this poorly i dont think the noise is from the gear box, im refering to if you put any car into the wrong gear when going too fast the car will make a sound untill it has slowed to the appropriate speed for the gear but initially their will be a sound from the exhuast from high revs wrong gear, ive also wondered if it could be the dmf like i said im clutching at straws

[Toms306]

It's probably just diesel knock, mine sounds bad for the first 10 mins or so, drowns the radio out!

[tuttyboy84]

Ok so i unplugged my egr valve to see if it made a difference and its sorted the nosie and vibration!!!! So why is it i cant leave it unplugged on my engine, i know its not advised but does anyone know why?

[Toms306]

Does it bring up the EML or go into limp mode? If not you can leave it off, will just leave a silent fault code like on a 306.

[tuttyboy84]

Its driven fine for the last 20 miles

[Ruan]

EGR plays a big role in how the DPF regenerates, unplugging it will likely cause problems with DPF regenerations in future and the engine will struggle to generate high enough temperatures to burn off soot...

[Redordead89]

EGR plays a big role in how the DPF regenerates, unplugging it will likely cause problems with DPF regenerations in future and the engine will struggle to generate high enough temperatures to burn off soot...

Yup! Don't go there if you can avoid it!

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Its driven fine for the last 20 miles

[quote='Ruan' pid='582916' dateline='1460247394']
EGR plays a big role in how the DPF regenerates, unplugging it will likely cause problems with DPF regenerations in future and the engine will struggle to generate high enough temperatures to burn off soot...

Yes but it hasn't driven right for probs the last couple of thou miles so sort the issue sooner rather than later or you'll just end up scrapping it when it costs too much to fix

[tuttyboy84]

Thanks ruan for the info about why i need the egr plugged in, good news is now i know thats the problem i can go about getting it sorted once and for all

[tuttyboy84]

Would fitting a blanking plate and plugging it back in be a solution?

[Toms306]

You may still get DPF issues with a blank plate, same as unplugging it. But you'll get DPF issues anyway, they're useless. It's often a stuck EGR that blocks the DPF quicker that it can regen anyway.

[tuttyboy84]

Will the fact i do so many miles mean it will passive regen regardless?

[Toms306]

Probably not. But I honestly don't know on your car. I did live tests on mine and could not get it hot enough to passive regen even at 80 in 4th (yes, the noise was unbearable). The 2.0s do seem to run hotter though. Do you notice many active regens?

[tuttyboy84]

How do i tell if its doing a regen?