CDTi sluggish acceleration at +3000 rpm

rexrover · 24th April 2012, 15:57

Have recently started to experience poor acceleration with my 2.0 CDTi (2004, 60k miles) - really only noticeable at above about 3000 r.p.m.when it seems to run out of grunt. It will continue to accelerate but very sluggishly. This is more of an issue starting off in first gear when, for example, trying to feed onto an island or from the acceleration lane onto a motorway. As befits a mature 75 owner I normally drive fairly sedately and cruising in 5th gear at around legal limits (!) and for normal motorway overtaking it is never a issue. Starting and idling is never a problem.

Last year at about 50k it became very lumpy and had a tendency to idle badly or even stall (i.e. different symptons to this time) so a local mechanic had the injectors tested. I understand that on removal one had some carbon deposits. This was cleaned and after testing (everything OK) and refitting the car ran perfectly.

Any advice om my current problem would be appreciated.

Brian Barker · 24th April 2012, 15:59

sounds like a dodgy maf to me

ASHEEN · 24th April 2012, 16:38

Maf Sensor.....

Try Ignition Car Parts, an insert is around £100.00 including a refunded surcharge on your old one.

Kind regards
A

rexrover · 24th April 2012, 16:50

Thanks for the replies.

'Fraid Im not really familiar with the MAF - how do I get at it and is there any way I can test it?

However, I seem to have read on one (or more?) of the threads that a MAF problem gives poor acceleration below 2000 rpm. Mine seems OK at these revs.

James.uk · 24th April 2012, 17:00

The MAF lives next to (left under cover) your oil filler pipe, just unplug it's lil plug and see if that helps...

...

350zwelgje · 24th April 2012, 17:23

Myself would check MAF by disconnecting it first to see if things improve. Thought it mostly does it work at the lower revs up to 2000rpm.

Also would check if the EGR is not clogged and the O-rings at the intercooler are ok (no oil behind left hand light) to make sure the engine still gets full turbo charged, before starting to buy parts.

Rob

maciejk · 16th August 2015, 14:03

my CDT accelerates good from 2000-3200rpm in 2nd gear u can really feel it pulling, then it feels like its not pulling at all from 3200 - 3700 (feels like clutch is slipping, though its not (probably) )RPMS keep going up & the speedometer keeps going up at that time too, is this normal? also the acceleration under first gear is awful driving slowly without touching the accelerator then slowly flooring it, it feels like it stumbles at times, 2nd gear is much better at the same rpms, car burns 6.1L/100km so i don't think its an injector issue, MAF was supposidly changed by the last owner not too long ago i thinks its a bosch, no ideling issues whatsoever

klarzy · 16th August 2015, 14:10

Check also the orings for the intercooler, and the hoses (large ones) feeding the top of the engine at the front right for swelling / pin holes. you may be loosing boost pressure. The EGR (engine gas return) valve may also be sooted up, a search on the site will help you identify and clean these parts...

maciejk · 17th August 2015, 19:38

the o-rings were fine i have the pipe glued permanently & siliconed around it, EGR is disabled

Arctic · 17th August 2015, 21:57

Quote:

Originally Posted by rexrover

Thanks for the replies.

'Fraid Im not really familiar with the MAF - how do I get at it and is there any way I can test it?

However, I seem to have read on one (or more?) of the threads that a MAF problem gives poor acceleration below 2000 rpm. Mine seems OK at these revs.

Hi Rex.
Click the link below and see if you have the same problem

http://www.the75andztclub.co.uk/foru...d.php?t=108032

PS also if you do need a new MAF you can opt for just the insert from below, I would not purchase just the insert from anywhere else.
http://www.maf-shop.com/product_info...621433566.html

If you prefer the whole unit then this is the one below.
Land Rover MHK101130 75 ZT MG Mass Air Flow Sensor Meter BOSCH 0928400520

24th April 2012, 15:57	#1
rexrover Newbie Rover 75 Saloon Join Date: Apr 2008 Location: Sutton Coldfield Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	CDTi sluggish acceleration at +3000 rpm Have recently started to experience poor acceleration with my 2.0 CDTi (2004, 60k miles) - really only noticeable at above about 3000 r.p.m.when it seems to run out of grunt. It will continue to accelerate but very sluggishly. This is more of an issue starting off in first gear when, for example, trying to feed onto an island or from the acceleration lane onto a motorway. As befits a mature 75 owner I normally drive fairly sedately and cruising in 5th gear at around legal limits (!) and for normal motorway overtaking it is never a issue. Starting and idling is never a problem. Last year at about 50k it became very lumpy and had a tendency to idle badly or even stall (i.e. different symptons to this time) so a local mechanic had the injectors tested. I understand that on removal one had some carbon deposits. This was cleaned and after testing (everything OK) and refitting the car ran perfectly. Any advice om my current problem would be appreciated.

24th April 2012, 15:59	#2
Brian Barker Regular poster mgzt cdti 135+ Join Date: Nov 2011 Location: durham Posts: 58 Thanks: 0 Thanked 0 Times in 0 Posts	sounds like a dodgy maf to me __________________ 2005 mgzt 135+ cdti (Remapped) 1975 rover p6b3500s 1973 rover p6b3500auto 1988 sierra rs cosworth,

24th April 2012, 16:38	#3
ASHEEN Loves to post Rover 75 CDT Connoisseur 165k and still going! Join Date: May 2011 Location: Crawley Posts: 315 Thanks: 0 Thanked 1 Time in 1 Post	Maf Sensor..... Try Ignition Car Parts, an insert is around £100.00 including a refunded surcharge on your old one. Kind regards A __________________ 165k And Going, AIRBAG LIGHT STILL ON!!!!!!!!!!

24th April 2012, 17:23	#6
350zwelgje Avid contributor 75 KV6 2.5 3x Rover 75 CDT Join Date: Jan 2011 Location: Belgium Posts: 249 Thanks: 6 Thanked 34 Times in 33 Posts	Myself would check MAF by disconnecting it first to see if things improve. Thought it mostly does it work at the lower revs up to 2000rpm. Also would check if the EGR is not clogged and the O-rings at the intercooler are ok (no oil behind left hand light) to make sure the engine still gets full turbo charged, before starting to buy parts. Rob __________________ 75 KV6 2.5 Sterling automatic, 3x 75 CDT (2 manual + automatic), MG ZT 190+, 620i, SD1 2300S, P6 2000SC & TVR 350i

16th August 2015, 14:03	#7
maciejk Avid contributor 99 Rover 75 CDT Join Date: Jun 2014 Location: poland Posts: 200 Thanks: 2 Thanked 2 Times in 2 Posts	my CDT accelerates good from 2000-3200rpm in 2nd gear u can really feel it pulling, then it feels like its not pulling at all from 3200 - 3700 (feels like clutch is slipping, though its not (probably) )RPMS keep going up & the speedometer keeps going up at that time too, is this normal? also the acceleration under first gear is awful driving slowly without touching the accelerator then slowly flooring it, it feels like it stumbles at times, 2nd gear is much better at the same rpms, car burns 6.1L/100km so i don't think its an injector issue, MAF was supposidly changed by the last owner not too long ago i thinks its a bosch, no ideling issues whatsoever __________________ 1999, Rover 75, Saloon, 2.0 CDT, Manual, LHD Last edited by maciejk; 16th August 2015 at 14:09..

24th April 2012, 16:50	#4
rexrover Newbie Rover 75 Saloon Join Date: Apr 2008 Location: Sutton Coldfield Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for the replies. 'Fraid Im not really familiar with the MAF - how do I get at it and is there any way I can test it? However, I seem to have read on one (or more?) of the threads that a MAF problem gives poor acceleration below 2000 rpm. Mine seems OK at these revs.

24th April 2012, 17:00	#5
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	The MAF lives next to (left under cover) your oil filler pipe, just unplug it's lil plug and see if that helps... ...

16th August 2015, 14:10	#8
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Check also the orings for the intercooler, and the hoses (large ones) feeding the top of the engine at the front right for swelling / pin holes. you may be loosing boost pressure. The EGR (engine gas return) valve may also be sooted up, a search on the site will help you identify and clean these parts... __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

17th August 2015, 19:38	#9
maciejk Avid contributor 99 Rover 75 CDT Join Date: Jun 2014 Location: poland Posts: 200 Thanks: 2 Thanked 2 Times in 2 Posts	the o-rings were fine i have the pipe glued permanently & siliconed around it, EGR is disabled __________________ 1999, Rover 75, Saloon, 2.0 CDT, Manual, LHD