Cdti loss of power below 2000 rpm

cbr1100xx · 26th May 2017, 12:40

Hi , I've tried the google search but not working so was wondering if someone could help , 2003 mg zt cdti , drives fine with no smoke but seems to lack power below 2000rpm and if in 4th on a very slight incline,revs at about 1500rpm seems to judder.change to 3rd and it is hesitant back to 2000rpm and then takes off.
Like I said tried the search but Say's something like permission not granted
Thanks in advance
Stan

EastPete · 26th May 2017, 12:50

Unplug MAF sensor and see if it drives better.

Pete

grivas · 26th May 2017, 14:21

Quote:

Originally Posted by cbr1100xx

Hi , I've tried the google search but not working so was wondering if someone could help , 2003 mg zt cdti , drives fine with no smoke but seems to lack power below 2000rpm and if in 4th on a very slight incline,revs at about 1500rpm seems to judder.change to 3rd and it is hesitant back to 2000rpm and then takes off.
Like I said tried the search but Say's something like permission not granted
Thanks in advance
Stan

Your MAF sensor might be on its last legs, unplug it and go for a spin if improved, then need to change sensor.

BigRuss · 26th May 2017, 14:40

All the diesels are fairly gutless below approx 2000 revs

Until the turbo spools up there isn't a huge amount of grunt low down on the rev range

Has it suddenly started doing this or has it been like that all along?

The Maf can have an effect as can a hole in the intercooler or pipework.

Russ

cbr1100xx · 26th May 2017, 17:39

Quote:

Originally Posted by BigRuss

All the diesels are fairly gutless below approx 2000 revs

Until the turbo spools up there isn't a huge amount of grunt low down on the rev range

Has it suddenly started doing this or has it been like that all along?

The Maf can have an effect as can a hole in the intercooler or pipework.

Russ

I think its been gradually getting worse , there is a large hill near me and the last few times I have thought it was low on power but not sure,but today it was worse with the juddering on a slight incline,feels a bit like a misfire, but as soon as you change down and press the pedal it clears and off we go , if you don't change down ,it's very sluggish, worse than normal.
I thought it might be the maf and will try it unplugged on Sunday on the hill and see.
I know there has been a lot written about inferior mafs so will it hurt unplugged until I can get a decent one?
Stan

kbonney88 · 26th May 2017, 18:32

I had this prob on my lastest rescue 75.. turned out to be the MAF..

as Pete says above - unplug it and see if the power is restored..

Kev

BigRuss · 26th May 2017, 23:14

Quote:

Originally Posted by cbr1100xx

I think its been gradually getting worse , there is a large hill near me and the last few times I have thought it was low on power but not sure,but today it was worse with the juddering on a slight incline,feels a bit like a misfire, but as soon as you change down and press the pedal it clears and off we go , if you don't change down ,it's very sluggish, worse than normal.
I thought it might be the maf and will try it unplugged on Sunday on the hill and see.
I know there has been a lot written about inferior mafs so will it hurt unplugged until I can get a decent one?
Stan

It won't harm to unplug the maf, the ecu then uses a back up value which overfuells the car slightly but that's about it. It does take the edge off the performance slightly compared with a good maf but it's far better option than running with one that's totally shot

Russ

T16 · 27th May 2017, 07:30

Agree with the sentiments here...

Below 2000 they are a little gutless, sometimes depends whether its on the boil or not so to speak. Occasionally Im surprised at 1800 rpm with the pull, but mainly left disappointed.

As said above, if you disconnect the MAF and it goes better, you've got the answer.

MarkS · 27th May 2017, 07:57

Is the MAF failing a function of it's age in years, or the number of miles travelled, or something else ?

FrenchMike · 27th May 2017, 14:06

Quote:

Originally Posted by MarkS

Is the MAF failing a function of it's age in years, or the number of miles travelled, or something else ?

Nobody knows ;pollution can be implied ? mine is 15 years old with 100kmiles

still working fine (but there is a favorable climate here

)

Mike

26th May 2017, 12:40	#1
cbr1100xx Gets stuck in VW touareg Join Date: Mar 2015 Location: dunsop bridge Posts: 870 Thanks: 225 Thanked 414 Times in 235 Posts	Cdti loss of power below 2000 rpm Hi , I've tried the google search but not working so was wondering if someone could help , 2003 mg zt cdti , drives fine with no smoke but seems to lack power below 2000rpm and if in 4th on a very slight incline,revs at about 1500rpm seems to judder.change to 3rd and it is hesitant back to 2000rpm and then takes off. Like I said tried the search but Say's something like permission not granted Thanks in advance Stan __________________ WE WERE BOTH BORN ON THE 4th of JULY CAR DIED 15/11/2022---I'M STILL GOING (JUST)

26th May 2017, 14:40	#4
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	All the diesels are fairly gutless below approx 2000 revs Until the turbo spools up there isn't a huge amount of grunt low down on the rev range Has it suddenly started doing this or has it been like that all along? The Maf can have an effect as can a hole in the intercooler or pipework. Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

26th May 2017, 12:50	#2
EastPete Posted a thing or two Rover 75 CDTi Classic saloon, MGB GT, Skoda Yeti Join Date: Aug 2008 Location: Ramsey, Cambs Posts: 1,874 Thanks: 626 Thanked 635 Times in 430 Posts	Unplug MAF sensor and see if it drives better. Pete

26th May 2017, 18:32	#6
kbonney88 I really should get out more....... Rover 75 Tourer & 75 Saloons Join Date: Apr 2012 Location: Perth/Glasgow Scotland Posts: 2,313 Thanks: 804 Thanked 656 Times in 512 Posts	I had this prob on my lastest rescue 75.. turned out to be the MAF.. as Pete says above - unplug it and see if the power is restored.. Kev

27th May 2017, 07:30	#8
T16 I really should get out more....... ZT CDTi 135, ZT260SE Join Date: Feb 2011 Location: Dundee Posts: 2,877 Thanks: 10 Thanked 331 Times in 213 Posts	Agree with the sentiments here... Below 2000 they are a little gutless, sometimes depends whether its on the boil or not so to speak. Occasionally Im surprised at 1800 rpm with the pull, but mainly left disappointed. As said above, if you disconnect the MAF and it goes better, you've got the answer.

27th May 2017, 07:57	#9
MarkS Gets stuck in Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011 Location: Bournemouth Posts: 664 Thanks: 189 Thanked 157 Times in 108 Posts	Is the MAF failing a function of it's age in years, or the number of miles travelled, or something else ?