[75driver]

Originally Posted by goofysth

Hello to all again.



I have two CDTi 75s, one is manual, one is auto.

Manual is perfect with performance, but Automatic is very sluggish and it lacks acceleration performance.



Basically, it has average performance below 2000rpm (but very similar to manual i have, so i assume that is what it is meant to be).

But, when i try to accelerate on steep or even slight hills it has very bad acceleration. Acceleration is specifically bad after 80 km/h (which is not the case on manual), no matter if i choose SPORT or any other mode.

I was travelling for 9 hours few days ago and it is a struggle to accelerate when it is important.



What i tried:

- Changed viton o-rings on both of them

- Did the leak back test on the injectors (everything OK)

- Checked injector imbalance values (all around 0.0)

- Changed MAF (previous one was bad according to values read on TOAF, and replacement improved performance slightly)



After all these, i compared results on the TOAF from both of them and boost pressure, inlet manifold pressure and fuel pressures (low and rail pressure) are the same on both of them.



Please, give me some ideas what can cause the problem and what to look after?



As well, i searched throughout the forum a lot, but didn't find a solution, so i decided to start a new thread.



Thank you all in advance

Are both cars the same from factory?
Ie are both 115bhp or 130bhp?
Or is the auto perhaps 115 and the manual 130 bhp.
Has either one been remapped?
Both of the above points alone may account for an appreciable difference.
However, If you’ve had the auto car for a while, and are now noticing a decline in performance, that’s another issue, most of the suspects which you’ve already looked at.🤔
What maf did you purchase?
Anything other than a proper Bosch one may be a waste of time.
Are MAF readings “within spec”...sorry I don’t have figures to hand, but you should be able to get them on here somewhere.


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