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Discussion Starter · #1 ·
Hi I am after any advice please! I've lost all faith in my car ?.I've been without my gullietta for 6months now, due to being in the garage and no one can fix the issue! Check engine code and limp mode comes on I have to pull over and restart car to get rid of the limp mode but will come back after 3miles it is coming back as Maf related but I've had dpf/maf/egr/turbo boost sensor/oil filter/air box/oxygen sensor/all pipes/tubes/apparently turbo has been checked too all have been checked and replaced if needed and still goes into limp mode. I've had 2 auto electrician look at it and said it was maf so had that changed for the second time but still the problem is still happening with same code (maf related).
Does anyone have a clue what it could be or had the same issue? Any advice would be much appreciated. Thank you
 

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You don't give any info at all !
Where?
What car model/ age / miles.
Does not seem familiar in all the 8 years of this Giulietta section....
 

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Broken or loose wire to the maf sensor. Any decent garage should have been able to check the live data from the maf and see if the readings were plausible. A broken wire would soon show up.
 

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Discussion Starter · #5 ·
Sorry first time posting it's a 2012 alfa Romeo gullietta veloce 2.0 jdtm 105,000 on the clock in uk. Well I had 2 auto electrictians look at it and they said it was mass air flow sensor so got that changed twice, but they seem to think it's mechanical fault.
 

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Sorry first time posting it's a 2012 alfa Romeo gullietta veloce 2.0 jdtm 105,000 on the clock in uk. Well I had 2 auto electrictians look at it and they said it was mass air flow sensor so got that changed twice, but they seem to think it's mechanical fault.
If the map is genuinely okay then the airflow through must be way down. (assuming it maf reading low) which implies:
  1. a big leak after the maf so air is getting to the the turbo but bypassing the maf,
  2. a blockage pre maf,
  3. your egr valve is stuck partially open so air is bypassing the engine (instead of exhaust entering the engine, air is revers flowing and entering the exhaust bypassing the engine) (maf would read high if this was the case)
  4. turbo vnt mechanism has seized in the high rpm position and low rpm boost is low as would be airflow.

A proper check of the live data: namely mass air flow and boost pressure would shed more light, not just reading the codes.
 

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Discussion Starter · #8 ·
I understand �� I was thinking maybe it could be something inside the turbo housing? as they only checked the outside of it and not the inside but apparently they have said it's fine. When i had the egr and dpf changed it was because it was full of soot and had caused a back pressure which resulted in the car breaking down and oil getting inside the turbo (limp mode and engine light was already on at this point (maf code)
 

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Discussion Starter · #9 ·
Sorry first time posting it's a 2012 alfa Romeo gullietta veloce 2.0 jdtm 105,000 on the clock in uk. Well I had 2 auto electrictians look at it and they said it was mass air flow sensor so got that changed twice, but they seem to think it's mechanical fault.
If the map is genuinely okay then the airflow through must be way down. (assuming it maf reading low) which implies:
  1. a big leak after the maf so air is getting to the the turbo but bypassing the maf,
  2. a blockage pre maf,
  3. your egr valve is stuck partially open so air is bypassing the engine (instead of exhaust entering the engine, air is revers flowing and entering the exhaust bypassing the engine) (maf would read high if this was the case)
  4. turbo vnt mechanism has seized in the high rpm position and low rpm boost is low as would be airflow.

A proper check of the live data: namely mass air flow and boost pressure would shed more light, not just reading the codes.
I will mention this to them on Tuesday about checking the live data. They cleaned out egr/air box/pipes checked new dpf had replaced turbo boost pressure sensor as they said that is was 99.9% the problem but was not they are Italian car specialists so you would think they would know.
 

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I had similar problem, and after a long time of nervous trials to find the problem and a lot of spent money...it was that wrong MAF sensor was installed. If you use BOSCH, find the one that is for cars WITH start&stop function. Check that out first.
 

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Discussion Starter · #11 ·
I had similar problem, and after a long time of nervous trials to find the problem and a lot of spent money...it was that wrong MAF sensor was installed. If you use BOSCH, find the one that is for cars WITH start&stop function. Check that out first.
Oh really I never thought of that thank you will check that!
 

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Oh really I never thought of that thank you will check that!
No problem, hope it helps!

If you have BOSCH MAF installed, BOSCH 0281002917 is the wrong one. It should be: BOSCH 0281006054.

I had a lot of LIMP MODE problems with the wrong one installed by used car dealer.
 

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Discussion Starter · #13 ·
Oh really I never thought of that thank you will check that!
No problem, hope it helps!

If you have BOSCH MAF installed, BOSCH 0281002917 is the wrong one. It should be: BOSCH 0281006054.

I had a lot of LIMP MODE problems with the wrong one installed by used car dealer.
I spoke to them about this,They said they already checked! They think it's the turbo and it's gone to be reconditioned as oil seals were worn and oil found in the intercooler. Don't know if this would make it go limp? But I'll try anything already thrown £2400 into trying to sort the issue that's never ending ?
 

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I spoke to them about this,They said they already checked! They think it's the turbo and it's gone to be reconditioned as oil seals were worn and oil found in the intercooler. Don't know if this would make it go limp? But I'll try anything already thrown £2400 into trying to sort the issue that's never ending ?
Sorry to hear that. My mechanics also tried to solve this LIMP MODE problem with my Giu for a long period of time. I had this problem for 2 years. The last mechanic drove a car for a period of one month to try to find the cause of this problem. He also suspected turbo, so he had it reconditioned. After that, the problem was still present. He then finally found out that it is the wrong MAF sensor that is causing the problem. He installed some Italian MAF sensor manufacturer, but he do not want to reveal which since probably wants to keep me as a customer.

By writing this, I'm not trying to state that in your case turbo might not be a problem. I'm just writing a report that my turbo at over 100 000 miles was quite fine, just one blade had to be processed.
 

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Discussion Starter · #15 ·
I spoke to them about this,They said they already checked! They think it's the turbo and it's gone to be reconditioned as oil seals were worn and oil found in the intercooler. Don't know if this would make it go limp? But I'll try anything already thrown £2400 into trying to sort the issue that's never ending ?
Sorry to hear that. My mechanics also tried to solve this LIMP MODE problem with my Giu for a long period of time. I had this problem for 2 years. The last mechanic drove a car for a period of one month to try to find the cause of this problem. He also suspected turbo, so he had it reconditioned. After that, the problem was still present. He then finally found out that it is the wrong MAF sensor that is causing the problem. He installed some Italian MAF sensor manufacturer, but he do not want to reveal which since probably wants to keep me as a customer.

By writing this, I'm not trying to state that in your case turbo might not be a problem. I'm just writing a report that my turbo at over 100 000 miles was quite fine, just one blade had to be processed.
Yea it turned out even tho the oil seals needed to be done and turbo was reconditioned, that did not stop the limp mode.He is now looking at the wastegate valve so see if this fixes it! Fingers crossed ? I have told him about the MAF and to check if it's the right part, he tells me it is. If it's not the waste gate he said he would have to look at the ECU.
 

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Discussion Starter · #16 ·
Hi I am after any advice please! I've lost all faith in my car ?.I've been without my gullietta for 6months now, due to being in the garage and no one can fix the issue! Check engine code and limp mode comes on I have to pull over and restart car to get rid of the limp mode but will come back after 3miles it is coming back as Maf related but I've had dpf/maf/egr/turbo boost sensor/oil filter/air box/oxygen sensor/all pipes/tubes/apparently turbo has been checked too all have been checked and replaced if needed and still goes into limp mode. I've had 2 auto electrician look at it and said it was maf so had that changed for the second time but still the problem is still happening with same code (maf related).
Does anyone have a clue what it could be or had the same issue? Any advice would be much appreciated. Thank you
So it turned out to be the timing belt/pulley the alfa specialist said its very unusual and it was the last thing they checked as the error code was indicateing the maf. So anyway it was replaced and now it drives like a dream �� so happy to have it back on the road. (Thought I would post an update just in case anyone else has had the same issue and needs advice.)
 

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How did he found out that it was the timing belt? Was it worn ? How many km's ? How old ? Tnx for the feedback on the post! Because I just got MAF errors on the car.
 
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