Hi all,

Just looking for a bit of advice.
Recently bought a 2007 320d e91 m47 engine pre dpf.

Initially when i bought the car a few weeks back all was good.
However now I am having some issues.
The car is re mapped, straight through exhaust, swirl flaps deleted and egr blanked.

Symptoms -
The car is down on power and MPG is down at 30-35 with relativly normal driving.

When initially driving the car first thing in the morning it will feel like its holding back, then a big plume of black smoke comes out the exhaust and it will stop hesitating and drive almost like its cleared the soot out. This always happens first thing however does randomly happen when out and about too.

Randomly when pulling out of junctions the car does the same thing even when warm and will hesitate/stutter and puff out black smoke from exhaust.

It doesnt like having the pedal put to the floor as it seems to bog down, light throttle driving is fairly ok but when giving it some it will either hesitate randomly or puff alot of black smoke from the exhaust when on full throttle.

Sometimes the car drives absolutely fine with no hesitation however even when driving fine it is certainly down on power but not horrifically. Turbo kicks in as it should as 1500/1600rpm

Things i have done - i have replaced the map sensor on the back of the intake manifold - i have cleaned the MAF sensor. Last service was 3k miles ago checked air filter and this is in good condition still plenty of white left on it.
I have disconnected the MAF sensor and drove with this off but it still drives with all the above listed issues. I have cleared the codes but this keeps coming back. I'm not sure where to go with this now so would appreciate any advice.

Sorry for the long post and thanks in advance im hoping someone can help!

Hi Alexander

Welcome to the Forum

Not an easy one to solve as the base line is long gone and unknown, to my way of thinking everything is sooted heavily so everything needs cleaning/changing to remove as much crud as possible from the system. Inlet manifold, Turbo, Exhaust downpipe and Cat. When you are sure everything is clean then reset all codes (Don't know what diagnostic you use but a BMW capable one is essential) If the soot is baked hard in places it may take a few attempts at cleaning to remove it, check all Vac lines and air lines that could be blocked (they will feel hard) 

May be find a Garage who can do a full Carbon clean (the chemical one) Once all is clean and you know the Turbo is operating as it should then you have a base line to set up against

Dave

Hi greydog,

 

Thanks for the reply. Sorry for the delay i didn't get a notification. It certainly is a tough one. Really difficult to know where to go with it as I've exhausted my relatively limited knowledge/skills. I don't want to just throw money at it as I don't have it and was hoping that someone had experienced the issue before and may have had some advice. With what you have mentioned any idea if getting it into a garage would cost alot or not? I did have it in a garage at the cost of £100 last week and they didn't really provide anything helpful and had no idea about the code. The scanner I use is a Topdon topscan if you have heard of it? Alternatively can you recommend a bmw one that wouldn't break the bank? Thanks Alex