Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Well the title says it all, really. I've been having a problem with fumes getting inside my Focus. My mechanic inspected the exhaust, fuel injector seals and much else. He came to the conclusion that the issue was caused by two things: the fact that the EGR valve was stuck open and the need for a DPF regen. The EGR valve has been changed and the fumes seem a little reduced - maybe. But there's still a kind of smoky, sooty smell getting in. Could that really be caused by a clogged DPF?

When I asked the mechanic for an explanation of how those two things could cause 'nasties' to escape the engine and then get in via the vents he said in both cases that it was a matter of unburnt fuel, but didn't elaborate.

Would like some feedback as to whether getting an artifical regen on the DPF is likely to help, and some explanation, perhaps, of how unburnt fuel can find its way into the air under the bonnet. I'm not knowledgeable about cars so the simpler the better! Thanks so much.

Edited by Bernie Smith on 16/11/2017 at 17:29

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - RT

Fumes in the cabin indicates a problem with the cabin/door/window sealing.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Fumes in the cabin indicates a problem with the cabin/door/window sealing.

Well the fumes are coming in through the vents when they are open. The fumes are more obvious if i just open the bonnet and take a good sniff.

Edited by Bernie Smith on 16/11/2017 at 17:39

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Oh damn. Meant all this to go in 'Technical matters'. Could someone switch this thread to that room, please?

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

What puzzles me about the work the mechanic has done and the DPF regen he proposes is that in my understanding all of the engine should essentially be sealed so that the only place any gases from the engine can get out are from the exhaust at the back of the car. If an EGR is faulty (but not leaking, he said) how does that lead to fumes escaping that 'sealed unit'.

The fumes in my car are definitely very present around the engine area. So is he on the wrong track or am I not understanding some basics here?!

Edited by Bernie Smith on 16/11/2017 at 17:58

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - pd

Are you absolutely 100% sure the injector seals are OK? These are the cause on 9/10 fume smells inside the cabin on these engines.

Check the toque of the injector clamps as well - don't over tighten them but sometimes these can work almost finger loose. Give each a half turn - think it is a T45 bit.

Can also sometimes leak from where the exhaust bolts onto the turbo.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

I'm going to repost this same question in the Technical Matters section - that was where it was actually meant to go!

Moderators, please feel free to delete this whole thread.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - RichardW

Injector seals / leak from the turbo to exhaust joint if the turbo has been disturbed / leak from the DPF if it's really blocked (although I would expect the light to be on if this was the case) / leak from the EGR to cooler joint if it's been disturbed.

My 307 was smelly, because of leaky injector seals - there was some build up of tar, but no chuffing noises. Been fine since they were done. I'd find someone who actually knows their way around this engine - try a local Cit / Pug specialist.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Thanks for the replies so far. All makes sense.

Will have a chat with the mechanic tomorrow to make doubly sure that injectors and other sources of leaks have been properly ruled out.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Update is that the change of EGR valve has definitely helped the fume issue rather noticeably but there are still some fumes (of a... sooty/smoky variety) getting inside the car..

I spoke with mechanic. He said injectors were not chuffing but that if there was a lot of pressure caused by clogged DPF it could nevertheless cause some escape of gas via injectors. Any thoughts?

He said there were definitely no leaks anywhere in exhaust and that the clogged DPF was probably 'back pressuring' and that it could be 'oozing' gases as a result of the pressure.

So... he sees an artificial regen as being the way to solve the rest of the fume issue (though apparently doing this is not straightforward as my car is giving his computer false readings which won't allow the regen to go ahead... but I'll leave all that for another time!)

I know little about cars and am fearing the prospect of many pounds leaving me... and no improvement occuring.

So... IS it feasible that artificial regen of DPF will stop the remaining fumes getting into the cabin?

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

And... if so, would not a passive regen do the same thing anway?

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Pica

When I experienced fumes inside the cabin of my CRV it was a split in the EGR pipe (in the concertina part). The pipe was replaced and that fixed it

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Thanks for replies. Appreciated.

Where I'm at with this is that I'm experiencing symptoms of CO poisening after driving car - including turning bright red for many hours.

Two mechanics have looked at the car now. Neither can find any leaks in injectors or exhaust. One has suggested artificial DPF regen as a solution, but that's not straightforward, apparently, as some 'magic box' that's in my car is giving the mechanic's computer wrong messages, so he will have to temporarily swap one from another car to do the regen... and it's all costing money that I don't have, hence my questions here!

So... I have two questions:

DPF: IS there a logical reason to suppose that a DPF regen will resolve the issue of fumes inside cabin? CAN a clogged DPF lead to fumes in the engine area, somehow? I would have thought everything would still be sealed... or am I missing something?

Injector seals: Both mechanics have (as far as I know) based their assessment of the injector seals on how they look and sound (ie. there's no deposits/oil around them and no chuffing).

So just supposing some injector work/replacement had been done just before I bought the car (but not WELL done), is it possible they could look good (I've hardly driven the car since buying it) but still be leaking a little?

Is there any definitive way to check the integrity of an injector seal?

Edited by Bernie Smith on 24/11/2017 at 07:22

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - RichardW

If the DPF is really blocked then it can leak exahust fumes out of the joint between the CAT and DPF, but I would expect to have a warning light and driveability issues. If it's as bad as you say it is, then it should be obvious just by doing a visual / smell inspection under the bonnet as to where it is coming from. Take the engine cover off, and start the engine, then have a a good look / smell around the injectors - if bad you may see smoke, and you will certainly smell it.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - HensTeeth

The top mounting bracket on the dpf can part company with the body, leaving a small hole which generates a significant leak. It's difficult to spot without removing/loosening the heat shielding, but if you can get an assistant to give the engine a couple of short sharp revs while you inspect under the bonnet, the plume of sooty exhaust leakage should identify the general area.

I doubt it's the injectors if there's no black goo round them and they're not chuffing.

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

Thanks for the last two replies, guys. Will take back to mechanic with all that in mind.

A further question! In my perception, the nature of the smell is a little... sooty, not just exhaust fumes. Could that point all the more towards a leak from DPF?

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Gibbo_Wirral

How old is the car, what mileage has it done? The DPF could just have reached EOL.

I'd expect the car to be in limp mode if its blocked. But if there's a leak in the system...

Edited by Gibbo_Wirral on 24/11/2017 at 12:30

Ford Focus Estate 1.6 TDCI - Will regen of DPF stop fumes in cabin? - Starman999

55 plate, 81k miles. Only owned the car for a few weeks and have avoided driving it because of the fume issue. Car mostly runs well, though occasionally holds back a bit as pulling away, then comes to life at higher revs...

Other info: EGR valve had been stuck open, was replaced a week ago. I understand this may have contributed to the DPF clog.

Also: Pat fluid is showing as empty when car is hooked up to mechanic's computer. But there's actually plenty of Pat fluid!

Also, mechanic's computer is being prevented from initiating DPF regen. He will need to swap some box or other in the car to go ahead with regen, apparently. I wonder if something has been preventing passive regen ever happening!

Am becoming very inclined to sell the car, now! I would declare the issue when doing so of course (it's not immediately obvious on a test drive - I missed it!). Whatever I do, I'm losing a lot of money... sigh! I hope to minimize that by taking the most cost effective route forward in terms of repair, or by selling the car as is asap.

 

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