[Keithlan1978]

As some of you might know I've posted on here about my 335d 2006 135,000 miles that's smoking on idle, it's not oil related as the car hasn't used a drop in about 1200 miles, it's not coolant as again it hasn't used a drop in about 1200 miles

It's 100% a over fuelling issue as I can smell it quite badly in and out the car and the MPG aren't as good as what I've seen other people say they get

Last week I decided to unplug the MAF sensor and ran the car for over 3 days with it unplugged which resulted in absolutely NO smoke at all, NO over fuelling smell at all and about 4 MPG more

So Friday I bought and fitted a brand new Bosch MAF sensor, reset MAF adaptions and also mean quantity adaptions, started the car and it smoked on idle, took the car out and no smoke but I could still smell fuel smell so I knew the smoke would follow, drove the car for about 50 ish miles Friday and Saturday with no smoke but still over fuelling smell

Gets in the car this morning and the smoking is back at idle, I'm seriously at a loss with car and don't know which way to turn next

Car is remapped with dpf off and I've had the map checked by 2 different company's and both say the map is fine and not the issue

I've blanked the EGR off but it's not mapped out but people tell me this won't cause the smoking issue

Any other ideas as to what it could be and can I run the car constantly without a the MAF plugged in and is it safe long term?

Since I bought the car on the diagnostics it's showing all 6 glow plugs which I'm guessing is more likely to be the relay but again everyone says this will have nothing to do with the smoking on idle so I'm reluctant to spend another few hundred pound on something that won't help with my issue

Any advice welcome

Thanks

[Yozh]

What remap? Are other people running same remap successfully and without issues?

[robnitro]

There's no possible way that you could be over fueling based on maf readings alone. Idle speed is limited by fueling. The only way you can idle with more fueling is if there is post injection, which is for dpf regen purposes. With the maf unplugged, the regen can't happen... It's tied to airflow reasons in the dde when it throttles the intake and uses egr to manage afr. In your case of egr delete its just going to dump fuel.... But without maf, it's an "error"and regen will not begin.



I asked you to log the data while this is happening and when it's not so we can compare what is going on. Do it in the same conditions, like in N while engine already warmed up.

Normal idle should use 0.7 l/h fuel and in N I can convert values, just be sure to log that, airflow/maf, egt and coolant temp. I bet your fuel rate goes up to 1.0+ and coolant and egt climbs.
Also if you have the throttle still attached, we can see if it's still being actuated by checking those values.

Again I still don't understand how you dismissed the remap as ok. You didn't fully explain how you eliminated this possible issue.

[335stoner]

what tune are you running???

[charlieb]

Have the injectors checked. If they aren't atomizing the fuel properly it can lead to un-burnt fuel going through the engine.

[robnitro]

The thing is he's not getting this smoke at idle with his maf unplugged.
Idle fueling is the key here. Also he posted a while ago screenshots and the idlemaf numbers were normal.

[Keithlan1978]

Another update, think I might have sorted my issue, noticed yesterday the ASV when car was started and on idle was facing the back then when revved would switch to the front then return to the back when let off the accelerator which from reading and watching vids on YouTube it should be facing the front on idle and not move when revved

So today I decided to back track on what I'd done and decided to unblank the EGR cooler so it's still functioning and turned the car over, the ASV on idle is now facing the front where it should be and doesn't move when revved

Smoking has now stopped with no over fuelling smell but it's only been a few hours so will monitor it over a few days

[robnitro]

Your tune is requesting egr to reduce airflow for regen. That's how regen works by limiting air so the burn is slower and later. Maybe just unplug the asv and egr and see if you don't get codes your tune might quit trying.
Anyway your tune is half assed bollocks lol

[Keithlan1978]

Originally Posted by robnitro

Your tune is requesting egr to reduce airflow for regen. That's how regen works by limiting air so the burn is slower and later. Maybe just unplug the asv and egr and see if you don't get codes your tune might quit trying.
Anyway your tune is half assed bollocks lol

The EGR wasn't mapped out in the map itself, I've just put the EGR back to standard so it's not functioning again and the car is fine with no smoke or fuel smell, it's only been today so will monitor it over the next few days

I'm assuming cos the EGR was blanked off but not mapped out it's somehow messing with MAF/MAP sensor hence the reason the air to fuel ratio was all over the place

[robnitro]

Yeah

[Sir_Dave]

Quick update on my scenario as well, just in case any advice can be given:

Transpires my 335d has had the DPF/EGR removed and mapped out. Its on 235k miles, full history etc.

It smokes on cold start idle, plus there is an occasion rev rise with MAF plugged in (both old MAF & new MAF). No Smoke/rev rise on cold start idle with MAF unplugged.

Done some basic data logging with a piece of paper & Carly:

Initial Cold start
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 30's, lots of smoke.
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 65's, lots of smoke.
MAF on steady 40/41, coolant 88, lots of smoke.
MAF on steady 40/41, coolant 91, lots of smoke.
MAF on steady 45, coolant 88, lots of smoke.
MAF on steady 50, coolant 95, minimal/no smoke.
MAF on steady 60, coolant 95, minimal/no smoke.
MAF on steady 50/52, coolant 92, minimal/no smoke.
MAF on steady 60/62, coolant 93, minimal/no smoke.
MAF on steady 51/52, coolant 94, minimal/no smoke.

Warm start
MAF on steady 54/55, coolant 83, lots of smoke.
MAF on steady 60, coolant 95, minimal/no smoke.

No smoke whatsoever with MAF unplugged, also no fault codes.

To me it seems like there is something over-fueling related going on below 90oC, and/or if the MAF is reading sub 50, but this is my first diesel in years (have a 335i as well) so being brutally honest, i have no idea how they work!!

[Keithlan1978]

Originally Posted by Sir_Dave

Quick update on my scenario as well, just in case any advice can be given:

Transpires my 335d has had the DPF/EGR removed and mapped out. Its on 235k miles, full history etc.

It smokes on cold start idle, plus there is an occasion rev rise with MAF plugged in (both old MAF & new MAF). No Smoke/rev rise on cold start idle with MAF unplugged.

Done some basic data logging with a piece of paper & Carly:

Initial Cold start
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 30's, lots of smoke.
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 65's, lots of smoke.
MAF on steady 40/41, coolant 88, lots of smoke.
MAF on steady 40/41, coolant 91, lots of smoke.
MAF on steady 45, coolant 88, lots of smoke.
MAF on steady 50, coolant 95, minimal/no smoke.
MAF on steady 60, coolant 95, minimal/no smoke.
MAF on steady 50/52, coolant 92, minimal/no smoke.
MAF on steady 60/62, coolant 93, minimal/no smoke.
MAF on steady 51/52, coolant 94, minimal/no smoke.

Warm start
MAF on steady 54/55, coolant 83, lots of smoke.
MAF on steady 60, coolant 95, minimal/no smoke.

No smoke whatsoever with MAF unplugged, also no fault codes.

To me it seems like there is something over-fueling related going on below 90oC, and/or if the MAF is reading sub 50, but this is my first diesel in years (have a 335i as well) so being brutally honest, i have no idea how they work!!

Hi mate just out of interest, when your car is running and just on idle, which way is your ASV and does it move when the car is revved?

[007_e350]

Just FYI, since I started using pennzoil euro L that’s Bmw ll04 the smoke on startup has completely disappeared. Anybody else noticed this ??

[Sir_Dave]

Originally Posted by Keithlan1978

Hi mate just out of interest, when your car is running and just on idle, which way is your ASV and does it move when the car is revved?

Was moving around all over the place!!

See here: https://www.e90post.com/forums/showt...6#post25055346

[ranthum]

Originally Posted by Sir_Dave

Quick update on my scenario as well, just in case any advice can be given:

Transpires my 335d has had the DPF/EGR removed and mapped out. Its on 235k miles, full history etc.

It smokes on cold start idle, plus there is an occasion rev rise with MAF plugged in (both old MAF & new MAF). No Smoke/rev rise on cold start idle with MAF unplugged.

Done some basic data logging with a piece of paper & Carly:

Initial Cold start
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 30's, lots of smoke.
MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 65's, lots of smoke.
MAF on steady 40/41, coolant 88, lots of smoke.
MAF on steady 40/41, coolant 91, lots of smoke.
MAF on steady 45, coolant 88, lots of smoke.
MAF on steady 50, coolant 95, minimal/no smoke.
MAF on steady 60, coolant 95, minimal/no smoke.
MAF on steady 50/52, coolant 92, minimal/no smoke.
MAF on steady 60/62, coolant 93, minimal/no smoke.
MAF on steady 51/52, coolant 94, minimal/no smoke.

Warm start
MAF on steady 54/55, coolant 83, lots of smoke.
MAF on steady 60, coolant 95, minimal/no smoke.

No smoke whatsoever with MAF unplugged, also no fault codes.

To me it seems like there is something over-fueling related going on below 90oC, and/or if the MAF is reading sub 50, but this is my first diesel in years (have a 335i as well) so being brutally honest, i have no idea how they work!!

You should definitely get a code with the MAF unplugged.

[Sir_Dave]

Originally Posted by ranthum

You should definitely get a code with the MAF unplugged.

Yeah, it came on on the next ignition cycle.

[Keithlan1978]

Originally Posted by Sir_Dave

Yeah, it came on on the next ignition cycle.

Just read your post, I'm having the same kind of issue or was having the same kind of issue and had it for about 4 weeks, my EGR was all blanked off but not mapped out so last Tuesday or Wednesday I decided to to take the blanks out and put it back to standard so it's functioning again and since I done that I've had no smoke

I'm going to get the car mapped tomorrow and blank the EGR off again so I'll see how it goes

[robnitro]

You can run maf with the throttle unplugged and it should be fine with a code. But damn 2 of y'all uk people with dpf delete but egr still on? Weird tuning in the uk... Usually people want to get rid of egr first, then dpf

[Keithlan1978]

Originally Posted by robnitro

You can run maf with the throttle unplugged and it should be fine with a code. But damn 2 of y'all uk people with dpf delete but egr still on? Weird tuning in the uk... Usually people want to get rid of egr first, then dpf

Is that the throttle that you mean can be unplugged?

God knows why my car was tuned with dpf off but egr still in place cos egr is the first thing I would of done on it

[Sir_Dave]

Originally Posted by robnitro

But damn 2 of y'all uk people with dpf delete but egr still on? Weird tuning in the uk... Usually people want to get rid of egr first, then dpf

I think the main issue over here is that any muppet can buy a laptop/remapping hardware, buy some wholesale maps and call themselves a "tuner". So you end up with a load of half-ar5ed maps floating about that dont actually do what they say they do, i.e. switch the EGR off

The proper live mappers, that change each piece of info byte by byte cost more, so invariably, most people just go with the cheap option. Is a shame you cant get MHD for the 335d though, ive been very impressed with it on my 335i!

[robnitro]

Yes that's the only plug that goes to the throttle. What else did you think I was saying?