No turbo on cdti

Jeff Turbo · 4th October 2016, 13:09

Hi guys
Got a problem with my MGZT cdti.
The other week on the way home from Ipswich the car lost power and I could only squeeze 50mph out of it and it wouldn't rev properly and no turbo boost. Long journey home.
Had a look see last week and the right side of the car was covered in soot. EGR bypass tube had a crack in it so I changed that.
The car now revs freely and no soot.
But on testing up the road, the turbo isn't boosting so a crawl up to 50mph, I've no idea why so any ideas guys?
I'm off on hols on sunday so will use one of my other cars, but I would like to fix this problem before I go

Many thanks

Lee T · 4th October 2016, 14:05

Hi, Have you checked you intercooler O rings and hose? Lee.

Jeff Turbo · 4th October 2016, 14:22

I've checked the hoses but not the intercooler o rings, I'm guessing they're on the intercooler as I haven't done that before. Edit
Just looked on the how to, so will try that, many thanks

TomRS · 4th October 2016, 15:22

Can you hear the turbo spooling up?

As above check to make sure all your boost pipes are connected and that the intercooler "O" rings are not split as that will lose you boost.

Secondly it could be a faulty MAP sensor (limp mode)

Try unplugging the MAF and doing a re-run just to illiminate that although i doubt it is that.

Wastegate could also be stuck open....

Mike Noc · 4th October 2016, 15:59

Does it rev freely in neutral? If not check and clean the LP fuel pressure sensor plug connection - it is the one on top of the fuel filter.

Jeff Turbo · 4th October 2016, 18:07

Yes it does rev freely in neutral.
I will try the o rings and unplugging the maf. Maf first as that's easier.
Engine management light isn't on

Jeff Turbo · 26th October 2016, 08:45

Finally got round to looking at the problem. Changed the O rings as they were shot and no difference, the revs again didn't go above 2k.
Unplugged the maf sensor and problem solved. Goes properly now, revs freely and turbo kicks in.
I have to assume the maf sensor is faulty so can I run the car with it unplugged before I replace it?

Chilljohn · 26th October 2016, 08:54

many seem to say you will be ok

if not

http://www.ebay.co.uk/itm/3813511366...%3AMEBIDX%3AIT

and change the sensor into your housing

TomRS · 26th October 2016, 16:17

Glad it was a simple enough solution.

MAF unfortunatly cost a fortune! as above is probably your best solution!

KRISTLEE · 26th October 2016, 17:20

After buying a new one from a local motor factors that was way out of spec and another new cheapy one from eBay that was just rubbish I bought a used one from a breakers and got 3rd time lucky as it was perfect and is still going strong 2yrs later....moral of the story - trying to save money by buying an alternative is just a waste and you are better off buying a new recommended one as advised.

Doing it trying to save money ended up costing me a lot more (and ending up with a used one anyway) than just biting the bullet and buying a tried and tested one

4th October 2016, 13:09	#1
Jeff Turbo Loves to post MGZT cdti Join Date: Mar 2011 Location: Lincoln Posts: 475 Thanks: 5 Thanked 28 Times in 24 Posts	No turbo on cdti Hi guys Got a problem with my MGZT cdti. The other week on the way home from Ipswich the car lost power and I could only squeeze 50mph out of it and it wouldn't rev properly and no turbo boost. Long journey home. Had a look see last week and the right side of the car was covered in soot. EGR bypass tube had a crack in it so I changed that. The car now revs freely and no soot. But on testing up the road, the turbo isn't boosting so a crawl up to 50mph, I've no idea why so any ideas guys? I'm off on hols on sunday so will use one of my other cars, but I would like to fix this problem before I go Many thanks __________________ 1958 White Ford Consul Convertible 1965 Gold Ford Zodiac Executive 1997 Blue Jaguar Xk8 Convertible 2004 Monogram Poseidon MGZT cdti 2004 Pearl Black MGZT 260

4th October 2016, 14:05	#2
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 853 Thanks: 180 Thanked 248 Times in 189 Posts	Hi, Have you checked you intercooler O rings and hose? Lee. __________________ [SIGPIC][/SIGPIC]

4th October 2016, 14:22	#3
Jeff Turbo Loves to post MGZT cdti Join Date: Mar 2011 Location: Lincoln Posts: 475 Thanks: 5 Thanked 28 Times in 24 Posts	I've checked the hoses but not the intercooler o rings, I'm guessing they're on the intercooler as I haven't done that before. Edit Just looked on the how to, so will try that, many thanks __________________ 1958 White Ford Consul Convertible 1965 Gold Ford Zodiac Executive 1997 Blue Jaguar Xk8 Convertible 2004 Monogram Poseidon MGZT cdti 2004 Pearl Black MGZT 260 Last edited by Jeff Turbo; 4th October 2016 at 14:30..

4th October 2016, 15:22	#4
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	Can you hear the turbo spooling up? As above check to make sure all your boost pipes are connected and that the intercooler "O" rings are not split as that will lose you boost. Secondly it could be a faulty MAP sensor (limp mode) Try unplugging the MAF and doing a re-run just to illiminate that although i doubt it is that. Wastegate could also be stuck open.... __________________ http://i66.tinypic.com/5cd6xj.jpg

4th October 2016, 18:07	#6
Jeff Turbo Loves to post MGZT cdti Join Date: Mar 2011 Location: Lincoln Posts: 475 Thanks: 5 Thanked 28 Times in 24 Posts	Yes it does rev freely in neutral. I will try the o rings and unplugging the maf. Maf first as that's easier. Engine management light isn't on __________________ 1958 White Ford Consul Convertible 1965 Gold Ford Zodiac Executive 1997 Blue Jaguar Xk8 Convertible 2004 Monogram Poseidon MGZT cdti 2004 Pearl Black MGZT 260

4th October 2016, 15:59	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Does it rev freely in neutral? If not check and clean the LP fuel pressure sensor plug connection - it is the one on top of the fuel filter.

26th October 2016, 08:45	#7
Jeff Turbo Loves to post MGZT cdti Join Date: Mar 2011 Location: Lincoln Posts: 475 Thanks: 5 Thanked 28 Times in 24 Posts	Finally got round to looking at the problem. Changed the O rings as they were shot and no difference, the revs again didn't go above 2k. Unplugged the maf sensor and problem solved. Goes properly now, revs freely and turbo kicks in. I have to assume the maf sensor is faulty so can I run the car with it unplugged before I replace it? __________________ 1958 White Ford Consul Convertible 1965 Gold Ford Zodiac Executive 1997 Blue Jaguar Xk8 Convertible 2004 Monogram Poseidon MGZT cdti 2004 Pearl Black MGZT 260 Last edited by Jeff Turbo; 26th October 2016 at 08:47..

26th October 2016, 08:54	#8
Chilljohn Posted a thing or two MG HS PHEV Join Date: Nov 2006 Location: Worksop Posts: 1,576 Thanks: 58 Thanked 80 Times in 75 Posts	many seem to say you will be ok if not http://www.ebay.co.uk/itm/3813511366...%3AMEBIDX%3AIT and change the sensor into your housing __________________ John Free enable of digital speedo readout on message centre (takes 2 mins) Free Vis motor testing, via obd port courtesy of my delphi so no need to take anything apart, along with free code scan including abs and airbag message me for details

26th October 2016, 16:17	#9
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	Glad it was a simple enough solution. MAF unfortunatly cost a fortune! as above is probably your best solution! __________________ http://i66.tinypic.com/5cd6xj.jpg

26th October 2016, 17:20	#10
KRISTLEE I really should get out more....... None at the moment. Join Date: Mar 2014 Location: Hartlepool Posts: 2,067 Thanks: 939 Thanked 384 Times in 294 Posts	After buying a new one from a local motor factors that was way out of spec and another new cheapy one from eBay that was just rubbish I bought a used one from a breakers and got 3rd time lucky as it was perfect and is still going strong 2yrs later....moral of the story - trying to save money by buying an alternative is just a waste and you are better off buying a new recommended one as advised. Doing it trying to save money ended up costing me a lot more (and ending up with a used one anyway) than just biting the bullet and buying a tried and tested one __________________ Best Regards, Lee. DONE: HAD A CRAZY IDEA THAT I HAD TO GET RID OF MY MG ZTT DUE TO NOT HAVING A DRIVE AND HAVING TO PARK ON A BUSY STREET WITH A VIEW TO GETTING ANOTHER ONE AT A LATER DATE WHEN I HAVE A DRIVE. ENDED UP REALISING IT REALLY ISN'T PRACTICAL NOT HAVING A CAR TO GET AROUND AND I NOW OWN A VW EOS 3.2 V6 INDIVIDUAL (1 OF 20 REMAINING IN THE UK WITH THAT ENGINE AND TRIM COMBO) EVEN THOUGH I STILL LIVE ON A BUSY ROAD WITHOUT A DRIVE