Had my dpf removed.

[Danboag]

Hi all. I've been having trouble with my superb II 140. There's no power when the engine is cold. I had the codes read and it came back as a pressure differential sensor for the dpf. I bit the bullet and had it removed rather than regenerated and had a bit if a cheeky remap while it was in. Since getting it back after having my wallet emptied the exact same problem persists. There's no power when the engine is first started, if I tickle it for a mile or so the power comes back. If I have to drive up a hill and put the engine under any load I get a check engine warning on my dash and she goes into limp home mode. I've had it back to the garage and had it read again and it's now a boost pressure regulation control range not reached (intermittent) P0299 code. They suggested a new MAF which hasn't worked. Just seeing if anyone had had any similar faults and could point me in the right direction.

Thanks for reading, Dan

[rover220]

Who did the work? There is only one company really worth considering when it comes to dpf removal

[Danboag]

It was Bolton injection centre. They came highly recommended from my mechanic who has sent a lot of cars their way.

[Robbo Cop]

Blocked fuel filter?

[Danboag]

Not sure. It only has the fault on initial startup. I took it out today with the same problem, but after 1.5 miles down the road it was perfect again. I don't know much about cars, but to me it seems like some sort of temperature sensor. The garage want me to leave it overnight so they can test it when it's cold. Stupid cars!

[shark_90]

The problem reported is boost request not reached. Check for leaks and check the turbo is working properly.

[Danboag]

I can't hear any leaks when I'm driving. The garage had it plugged in when it was warm and took if round the block. He said it was making 1.6bar. Don't understand why it's perfect after it's been driven for a few minutes.

[slywacht]

I have a silly question; did anybody diagnosed that surely the DPF was faulty before surgical procedures? Has anybody had a look into G450 - exhaust gasses pressure sensor which could in my opinion result in those faults? The dpf emulation now will still have incorrect value from a faulty sensor. Easy to replace. No adaptation needed... worth checking IMHO

Wys?ano z Nokii 3310 za pomoc? Klawiatury :-)

[Danboag]

Is that the pressure differential sensor either side of the dpf? If so, that was throwing up a code that the dpf was blocked. It was at my request to take off the dpf rather than regen it as the type if driving I do would result in the dpf keep getting blocked in future. It's the pressure regulator sensor that's showing now though ( coincidence?). It's back in on Monday to test it when it's cold. I'll let you know what's wrong in case anyone ever has the same fault.

[Danboag]

I tried to get to work today and it went into limp mode four times. I pulled over and unplugged the MAF sensor and the car ran fine, although I had a couple of engine warning lights. Does that mean that it's just a faulty MAF?

[shark_90]

Not necessarily no. A problem like this is going to be difficult to diagnose now it's mapped as it's difficult to know what's been altered.

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[slywacht]

Hi,

When you chopped the dpf out, there must be an emulation telling the ecu that dpf is fine and free of soot. The data might(assumption?) Still be collected from sensors. The G450 is a common problem. Google where it is as I'm at work away from the car. It's got one bolt holding it and two rubber pipes connected. Easy access from under bonnet. Doesn't cost much and its worth a shot. Do you have vcds? If so check the before/after dpf pressures to confirm before replacement.

Wys?ano z Nokii 3310 za pomoc? Klawiatury :-)

[Danboag]

Thanks for looking at this for me. I tried the unplugging trick this morning after nights and it didn't work like it did last time. The garage have offered to diagnose it for free for me. He reckons it shouldn't be anything major. I'm hoping it's something they've done with the remap and will just mend it and cover their tracks. I'll update this on Tuesday after it's been in. It might help someone else in the future.

[Danboag]

I might be getting somewhere. The garage have diagnosed it while cold and found a split diaphragm on some vacuum pipe that goes into the rocker. (Or summat, I know it's a bit vague). He said when he blocked it off some needle moved for the turbo, apparently I've never had full boost. Looks like I'll be chucking another two hundred at it.