Start up problems

[[email protected]]

Thanks.
I have changed the spark plugs today.
Cylinder 123 was not good. Smell of petrol and sooty. Worst was nr 2 counting from front and backwards.

I'll do a new acceleration log by tomorrow. Hope you have time to read this to?!?

Thanks so far.

 

[R.E92]

Thanks.
I have changed the spark plugs today.
Cylinder 123 was not good. Smell of petrol and sooty. Worst was nr 2 counting from front and backwards.

I'll do a new acceleration log by tomorrow. Hope you have time to read this to?!?

Thanks so far.

Petrol smell on plugs is leaky injectors.

If you're handy with tools you can perform a leak test on the injectors like this: https://www.youtube.com/watch?v=N-cliDST_vc

I should be able to see clearly in an acceleration log though. More specifically in the part of the log during engine overrun. If the lambda reading doesn't peg out of range when injection is shut off then you almost certainly have a leaking injector.

 

[[email protected]]

Thanks.
I have changed the spark plugs today.
Cylinder 123 was not good. Smell of petrol and sooty. Worst was nr 2 counting from front and backwards.

I'll do a new acceleration log by tomorrow. Hope you have time to read this to?!?

Thanks so far.

Petrol smell on plugs is leaky injectors.

If you're handy with tools you can perform a leak test on the injectors like this: https://www.youtube.com/watch?v=N-cliDST_vc

I should be able to see clearly in an acceleration log though. More specifically in the part of the log during engine overrun. If the lambda reading doesn't peg out of range when injection is shut off then you almost certainly have a leaking injector.

Here is a acceleration log from today. Let see if you can confirm the leaking injectors even here.

 

[Zikim]

Those logs show that your injectors are fine as both banks max out at 235:1 AFR.

I have just had my injectors replaced and my logs showed bank2 maxed out at 235:1 whilst bank1 was at 189:1 showing leaking injector.

 

[enuff_zed]

Those logs show that your injectors are fine as both banks max out at 235:1 AFR.

I have just had my injectors replaced and my logs showed bank2 maxed out at 235:1 whilst bank1 was at 189:1 showing leaking injector.

Is it not likely that the injectors are indeed working fine but leak a little when you shut down?
This would give rise to the OPs specific symptoms. Cold, it is fine as any fuel has had the time to evaporate off the plugs; hot, the fuel is evaporated straight away by the heat. A bit warm, the petrol leaks onto the plugs and sits there for a while before it is able to completely evaporate. Hence making it difficult to spark up as the plug is still wet.

 

[R.E92]

Thanks.
I have changed the spark plugs today.
Cylinder 123 was not good. Smell of petrol and sooty. Worst was nr 2 counting from front and backwards.

I'll do a new acceleration log by tomorrow. Hope you have time to read this to?!?

Thanks so far.

Petrol smell on plugs is leaky injectors.

If you're handy with tools you can perform a leak test on the injectors like this: https://www.youtube.com/watch?v=N-cliDST_vc

I should be able to see clearly in an acceleration log though. More specifically in the part of the log during engine overrun. If the lambda reading doesn't peg out of range when injection is shut off then you almost certainly have a leaking injector.

Here is a acceleration log from today. Let see if you can confirm the leaking injectors even here.

The injectors aren't leaking on overrun there but it doesn't mean they are healthy. There's certainly issues with the combustion as you are getting knock.

The rail pressure is healthy so fuel pump looks OK.

Short of pulling the injectors and looking for a leak you're not going to progress any more with the diagnostic without just replacing them.

 

[[email protected]]

6 new injectors will be fitted this friday. A analys of the combustion will also be done. Hope that this will do.
Even the coils will be checked, what I can see they are ok. But since all other things now is on the table its better to check again.
Any more suggestion of what to do?
This baby will shortly be back on track more powerful than ever.

 

[R.E92]

That should get you sorted.

If you want to add a few things to check while it's in the workshop then:
Check DCT pan for leak
Check for valve cover oil leak

 

[[email protected]]

That should get you sorted.

If you want to add a few things to check while it's in the workshop then:
Check DCT pan for leak
Check for valve cover oil leak

Back on track. Injectors upgraded to index12 all over. The old ones were index 9 and I think I read some were that these were one bad index.
Although the car is back and it starts much better and have a smooth idle.
I made a accelerationlog and its in some points different from before.
But I feelt a bit of lag during acceleration yesterday. Is this normal?

 

[[email protected]]

The file.

 

[R.E92]

The file.

You are getting a load of timing corrections. Normally that's either bad fuel or bad spark plugs, since you changed the plugs recently I would think it's the fuel. That tune is designed for 102RON fuel, do you get that kind of stuff up in Sweden? It's possible that any fuel you are getting at the moment has been sat around for a long time due to the huge drop in fuel demand.

Also your intake temperatures are really high. The weather is probably as hot as it's going to get at the moment but still seems higher than I would expect for a stage 1 tune. Maybe a small boost leak somewhere causing the turbos to work harder. The wategate positions do seem quite high for that boost target.

Did you reset the fuel adaptations after changing injectors? If not I would certainly do that as any fuel corrections it had to make with the old leaking injectors will still be in place.

 

[ph001]

Yeh, it’s vital to reset the long term fuel trims when replacing injectors. Also it might take a few days driving for the ecu to fully adapt to the new fuelling.

 

[[email protected]]

The file.

You are getting a load of timing corrections. Normally that's either bad fuel or bad spark plugs, since you changed the plugs recently I would think it's the fuel. That tune is designed for 102RON fuel, do you get that kind of stuff up in Sweden? It's possible that any fuel you are getting at the moment has been sat around for a long time due to the huge drop in fuel demand.

Also your intake temperatures are really high. The weather is probably as hot as it's going to get at the moment but still seems higher than I would expect for a stage 1 tune. Maybe a small boost leak somewhere causing the turbos to work harder. The wategate positions do seem quite high for that boost target.

Did you reset the fuel adaptations after changing injectors? If not I would certainly do that as any fuel corrections it had to make with the old leaking injectors will still be in place.

The fuel 102 ron should if I am not wrong be the same as 95 oct right? We also got 98 oct as regular gas but I have used 95.

I also saw the higt iat. During my drive yestetday i had the monitor up all time. The tempreture was under regular drive like 24-35 degres. When using more power never over 45. So I really dont understand this figures, but I will fore sure keep an eye on it.

How can I reset the fuel adaption?
The new injectors were replaced at a nown BMW dealer so shuoldent this be done by them you think?

 

[[email protected]]

Yeh, it’s vital to reset the long term fuel trims when replacing injectors. Also it might take a few days driving for the ecu to fully adapt to the new fuelling.

Good point. Ill give it dome days before I make a new log.

 

[R.E92]

The file.

You are getting a load of timing corrections. Normally that's either bad fuel or bad spark plugs, since you changed the plugs recently I would think it's the fuel. That tune is designed for 102RON fuel, do you get that kind of stuff up in Sweden? It's possible that any fuel you are getting at the moment has been sat around for a long time due to the huge drop in fuel demand.

Also your intake temperatures are really high. The weather is probably as hot as it's going to get at the moment but still seems higher than I would expect for a stage 1 tune. Maybe a small boost leak somewhere causing the turbos to work harder. The wategate positions do seem quite high for that boost target.

Did you reset the fuel adaptations after changing injectors? If not I would certainly do that as any fuel corrections it had to make with the old leaking injectors will still be in place.

The fuel 102 ron should if I am not wrong be the same as 95 oct right? We also got 98 oct as regular gas but I have used 95.

I also saw the higt iat. During my drive yestetday i had the monitor up all time. The tempreture was under regular drive like 24-35 degres. When using more power never over 45. So I really dont understand this figures, but I will fore sure keep an eye on it.

How can I reset the fuel adaption?
The new injectors were replaced at a nown BMW dealer so shuoldent this be done by them you think?

Fuel adaptations can be reset in MHD quite easily. It's under the codes menu.

You need to pay attention to what the fuel you are buying is rated at. If you're sure it's 102RON then that's great but I'd be surprised, that's classed as race fuel in most places. In the UK we have 95RON standard and 99RON as a premium fuel.
You have a lot of timing corrections so there's a problem somewhere. I would visually check the injector install and make sure they didn't forget the decoupling elements.

Where did the new plugs come from and what model are they? If they are from Amazon or eBay there's a strong possibility of fake plugs. Plenty of news recently about Chinese knock-off spark plugs making the rounds.