CDTi loosing power

Steven211 · 5th November 2019, 20:25

Hello all, I bought my ZT a few months ago and was told it has a 'maffless' remap done by a well known person in the MG Rover community, I noticed it produced a stupid amount of smoke and it sounded awful pulling away from low revs (pinking) and not very smooth. Anyway I reconnected the MAF sensor as I was told that it puts the ecu back to normal, is this correct?

Anyway I noticed straight away that the car felt smoother driving and produced less smoke. But then I noticed I kept loosing all power, the engine would rev to the redline but it was almost like I had no boost, very intermittent. So I replaced the MAF sensor in the weekend. It is now a million times better, but occasionally it will go flat and loose power, not as often as before.

Tonight I have disconnected the MAP sensor on the manifold as an experiment and its so much better to drive, slightly less smoke and it doesn't loose power at all. Are these common on ZT/75s to fail? Also could the remap be to blame too and will it need to be removed properly or remapped properly to stop the smoke altogether as its still a bit smokey? I have already fitted the BMW PCV breather, I work at BMW so know about the modified breather on M47/57 diesels.

trikey · 5th November 2019, 20:27

Lose the mafless remap, they are known to fail emissions at mot time, im pretty sure this will be the cause of your issue.

marinabrian · 5th November 2019, 20:30

Tom Force do your remap by any chance?

If this is the case, then reconnecting the MAF will do nothing

Brian

Steven211 · 5th November 2019, 20:37

Cheers guys just what I thought, as someone who has had remaps before it is a very poor remap I think. I was thinking of using Celtic tuning to put a proper map on it as they have remapped my Freelander 2 and my old Civic and did a great job. Chaz did the remap I was told.

Arctic · 5th November 2019, 21:09

Quote:

Originally Posted by Steven211

Cheers guys just what I thought, as someone who has had remaps before it is a very poor remap I think. I was thinking of using Celtic tuning to put a proper map on it as they have remapped my Freelander 2 and my old Civic and did a great job. Chaz did the remap I was told.

Hi Steven.
If you are going to have a remap then go to one of the T4 gurus; on here, Brian, Russ, Trikey, remember you can have it done by post as well,

get the manifold cleaned out, and the EGR cleaned or a gutted one fitted

also next year you are welcome to out Nano meets link below.

http://www.midlandsnanomeets.co.uk/history.html

Steven211 · 5th November 2019, 21:11

Quote:

Originally Posted by Arctic

Hi Steven.
If you are going to have a remap then go to one of the T4 gurus; on here, Brian, Russ, Trikey, remember you can have it done by post as well,

also next year you are welcome to out Nano meets link below.

http://www.midlandsnanomeets.co.uk/history.html

Thank you for your advice I will sure contact one of them and I will try and come to a few meets for sure.

5th November 2019, 20:25	#1
Steven211 Regular poster VW Golf TDI yawn Join Date: Jul 2019 Location: Worcester Posts: 83 Thanks: 21 Thanked 19 Times in 12 Posts	CDTi loosing power Hello all, I bought my ZT a few months ago and was told it has a 'maffless' remap done by a well known person in the MG Rover community, I noticed it produced a stupid amount of smoke and it sounded awful pulling away from low revs (pinking) and not very smooth. Anyway I reconnected the MAF sensor as I was told that it puts the ecu back to normal, is this correct? Anyway I noticed straight away that the car felt smoother driving and produced less smoke. But then I noticed I kept loosing all power, the engine would rev to the redline but it was almost like I had no boost, very intermittent. So I replaced the MAF sensor in the weekend. It is now a million times better, but occasionally it will go flat and loose power, not as often as before. Tonight I have disconnected the MAP sensor on the manifold as an experiment and its so much better to drive, slightly less smoke and it doesn't loose power at all. Are these common on ZT/75s to fail? Also could the remap be to blame too and will it need to be removed properly or remapped properly to stop the smoke altogether as its still a bit smokey? I have already fitted the BMW PCV breather, I work at BMW so know about the modified breather on M47/57 diesels.

5th November 2019, 20:27	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,762 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Lose the mafless remap, they are known to fail emissions at mot time, im pretty sure this will be the cause of your issue. __________________ Lest we forget..

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5th November 2019, 20:30	#3
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Tom Force do your remap by any chance? If this is the case, then reconnecting the MAF will do nothing Brian

5th November 2019, 20:37	#4
Steven211 Regular poster VW Golf TDI yawn Join Date: Jul 2019 Location: Worcester Posts: 83 Thanks: 21 Thanked 19 Times in 12 Posts	Cheers guys just what I thought, as someone who has had remaps before it is a very poor remap I think. I was thinking of using Celtic tuning to put a proper map on it as they have remapped my Freelander 2 and my old Civic and did a great job. Chaz did the remap I was told.