Lack of power CDT - help

moonstoneboy · 1st April 2009, 06:39

Due to go on a little drive on Friday, just 730 miles....

This morning, coming in to work along the M23 went to overtake someone and there was no power there. Came of the M23 and up a hill and I did not really notice power not being there. A little further along the journey and I needed ot turn off to climb a fairly steep hill but again the power was not there so went a longer, more flatter way round. Then there is a stretch where the limit is 60. It did pick up but nothing like noral.

Got to work and checked under the bonnet and the under bonnet pump was whirring around - admittedly I had stopped the engine poked around the connections, turned the ignition on an there it was whirring (I replaced the in tank pump a couple of months ago). Started the engine and pushed down on the accelerator. It did not seem to rev with any enthusiasm and when it was running at fairly high revs it was not smooth but the revs were fluctuating.

Any suggestions gratefully received.

Paul

A little additional info - when I replaced the in-tank pump it was because it would not start. I was unsure whether the under-bonnet pump was operating correctly but an ear to the in-tank one and there was no noise I therefore replaced that one but did also buy the under bonnet one which I have not fitted. Yesterday morning the thing would not start, tapped the under bonnet pump and it did start.

moonstoneboy · 1st April 2009, 10:19

Just a little bump but I have been looking through others problems - how likely do you think this could be the MAF.

Unfortunaely, I am a work without the right tools to get at the maf connector - can get to one of the clips as it is but not the other.

One of the local factors ( a Bosch distributor) has one of the shelf and at 132,000 miles it probably benefit from a new one but I would rather not pay out at the moment on spec unless it is felt that this is likely to be the problem.

Paul

Kandyman · 1st April 2009, 10:41

sounds like a maf to me.

http://tuning-diesels.com/75Zt/R75maf.htm

A) First you need to determine if your MAF sensor is 'dead'.

Complete failure is rare: Usually you will experience other symptoms I.e. some or all of the following:-

*

Very poor throttle response with very slow initial rise in engine revs
*

erratic or lumpy idle
*

uneven acceleration even above 2000rpm
*

the effect of the turbo can hardly be felt
*

surging or hesitation
*

juddering and shuddering
*

reluctance to rev.
*

smokey exhaust

M3NDEREZ · 1st April 2009, 11:24

When my MAF went, the only symptom I got was the "Very poor throttle response with very slow initial rise in engine revs" ... The turbo still have a hell of a boost when it kicked in, and accelleration from 50 - 70 for example was absolutely fine..

I think it effects everyone differently depending on the degredation of the sensor.. I'd say disconnect that bad boy, drive it for a couple of miles and se if it's any better. If you see an improvement, connect it back up and buy a new one (or a Pierburg and a Synergy2 - You know you want to!).. If disconnecting it doesn't help, at least you've ruled out the MAF..

One thing that RoverRon's website and intructions doesn;t tell you is that some MAF sensors are held on by security torx screws - I got half way through the installation, of the new MAF, then couldn;t go any further as I didn't have any! Anyway, I have a set now, so if you're unfortunately enough to have yours held in by them, and you don;t have a set, just drop in and grab my set.. They may as well get some use, all they've done is changed a MAF sensor and an Airbag cover!!

moonstoneboy · 1st April 2009, 12:01

Thanks for the replies. Just been out in it and it seemed fine and then a little loss of power and then back to fine.

Now wondering if the under bonnet pump is acting up.

Looks to me like the battery tray needs to come out so might chance it until I get to my destination and then change it.

Thinks that buying a MAF might be a good idea - I can then eliminate it but at my mileage the existing one must be a little tired.

Thanks for the offer Carl.

Paul

mcdonaa · 1st April 2009, 19:56

Don't replace it with the MGRover fit bosch though at nearly £200 + fitting though! Go for a MAFAM or Synergy2 with Pierburgh MAF - replacement Pierburghs are approx £50 and are more reliable.

However, a duff MAF will not affect 2K+ rpm when turbo is spooled up - only affects low end fueling. From what I have read also, the MAF gradually de-grades over time, not usually all or nothing. I would maybe look at a few other things first.

JohnDotCom · 1st April 2009, 20:32

Try unplugging the MAF and see how she runs.

moonstoneboy · 2nd April 2009, 06:19

Thanks for the replies. I had to go out yesterday lunch time and it seemed fine apart from one brief period. The journey home last night was fine so that to me would take me away from the MAF.

I have concluded that it must be the underbonnet pump that occassionally decides to go on strike. I have loaded the new one in the car, hopefully I will not have to change it en-route and will change it at my destination. I will also unplug the MAF and see what effect that has - and plan to fit the pieburg (?) and MAFAM.

Thanks

Paul

1st April 2009, 06:39	#1
moonstoneboy Posted a thing or two Rover 75 Connoisseur SE CDT Tourer - naturally in Moonstone Green Join Date: Oct 2007 Location: Surrey - near Gatwick Airport Posts: 1,316 Thanks: 0 Thanked 3 Times in 3 Posts	Lack of power CDT - help Due to go on a little drive on Friday, just 730 miles.... This morning, coming in to work along the M23 went to overtake someone and there was no power there. Came of the M23 and up a hill and I did not really notice power not being there. A little further along the journey and I needed ot turn off to climb a fairly steep hill but again the power was not there so went a longer, more flatter way round. Then there is a stretch where the limit is 60. It did pick up but nothing like noral. Got to work and checked under the bonnet and the under bonnet pump was whirring around - admittedly I had stopped the engine poked around the connections, turned the ignition on an there it was whirring (I replaced the in tank pump a couple of months ago). Started the engine and pushed down on the accelerator. It did not seem to rev with any enthusiasm and when it was running at fairly high revs it was not smooth but the revs were fluctuating. Any suggestions gratefully received. Paul A little additional info - when I replaced the in-tank pump it was because it would not start. I was unsure whether the under-bonnet pump was operating correctly but an ear to the in-tank one and there was no noise I therefore replaced that one but did also buy the under bonnet one which I have not fitted. Yesterday morning the thing would not start, tapped the under bonnet pump and it did start. Last edited by moonstoneboy; 1st April 2009 at 06:46.. Reason: Added info

1st April 2009, 11:24	#4
M3NDEREZ Posted a thing or two R75 DUB Saloon Connoisseur CDT + Synergy2 Join Date: Dec 2008 Location: Earlswood, Surrey Posts: 1,344 Thanks: 0 Thanked 0 Times in 0 Posts	When my MAF went, the only symptom I got was the "Very poor throttle response with very slow initial rise in engine revs" ... The turbo still have a hell of a boost when it kicked in, and accelleration from 50 - 70 for example was absolutely fine.. I think it effects everyone differently depending on the degredation of the sensor.. I'd say disconnect that bad boy, drive it for a couple of miles and se if it's any better. If you see an improvement, connect it back up and buy a new one (or a Pierburg and a Synergy2 - You know you want to!).. If disconnecting it doesn't help, at least you've ruled out the MAF.. One thing that RoverRon's website and intructions doesn;t tell you is that some MAF sensors are held on by security torx screws - I got half way through the installation, of the new MAF, then couldn;t go any further as I didn't have any! Anyway, I have a set now, so if you're unfortunately enough to have yours held in by them, and you don;t have a set, just drop in and grab my set.. They may as well get some use, all they've done is changed a MAF sensor and an Airbag cover!! __________________ [SIGPIC][/SIGPIC] STILL WANTED: Black Leather & Chrome Auto Gearknob, Diesel Cruise ECU, EGR Bypass.

1st April 2009, 19:56	#6
mcdonaa Avid contributor 2002 ZT-T 190 Join Date: Mar 2009 Location: St.Leonards-On-Sea Posts: 137 Thanks: 10 Thanked 0 Times in 0 Posts	Don't replace it with the MGRover fit bosch though at nearly £200 + fitting though! Go for a MAFAM or Synergy2 with Pierburgh MAF - replacement Pierburghs are approx £50 and are more reliable. However, a duff MAF will not affect 2K+ rpm when turbo is spooled up - only affects low end fueling. From what I have read also, the MAF gradually de-grades over time, not usually all or nothing. I would maybe look at a few other things first. __________________ 2002 Le Mans Green ZT-T+ 190 [SIGPIC][/SIGPIC]

1st April 2009, 10:19	#2
moonstoneboy Posted a thing or two Rover 75 Connoisseur SE CDT Tourer - naturally in Moonstone Green Join Date: Oct 2007 Location: Surrey - near Gatwick Airport Posts: 1,316 Thanks: 0 Thanked 3 Times in 3 Posts	Just a little bump but I have been looking through others problems - how likely do you think this could be the MAF. Unfortunaely, I am a work without the right tools to get at the maf connector - can get to one of the clips as it is but not the other. One of the local factors ( a Bosch distributor) has one of the shelf and at 132,000 miles it probably benefit from a new one but I would rather not pay out at the moment on spec unless it is felt that this is likely to be the problem. Paul

1st April 2009, 10:41	#3
Kandyman Banned ROVER 75 2.5 V6 Connoisseur SE Limousine 2004 Join Date: Oct 2006 Location: Welling Posts: 10,995 Thanks: 0 Thanked 2 Times in 2 Posts	sounds like a maf to me. http://tuning-diesels.com/75Zt/R75maf.htm A) First you need to determine if your MAF sensor is 'dead'. Complete failure is rare: Usually you will experience other symptoms I.e. some or all of the following:- * Very poor throttle response with very slow initial rise in engine revs * erratic or lumpy idle * uneven acceleration even above 2000rpm * the effect of the turbo can hardly be felt * surging or hesitation * juddering and shuddering * reluctance to rev. * smokey exhaust

1st April 2009, 12:01	#5
moonstoneboy Posted a thing or two Rover 75 Connoisseur SE CDT Tourer - naturally in Moonstone Green Join Date: Oct 2007 Location: Surrey - near Gatwick Airport Posts: 1,316 Thanks: 0 Thanked 3 Times in 3 Posts	Thanks for the replies. Just been out in it and it seemed fine and then a little loss of power and then back to fine. Now wondering if the under bonnet pump is acting up. Looks to me like the battery tray needs to come out so might chance it until I get to my destination and then change it. Thinks that buying a MAF might be a good idea - I can then eliminate it but at my mileage the existing one must be a little tired. Thanks for the offer Carl. Paul

1st April 2009, 20:32	#7
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Try unplugging the MAF and see how she runs.

2nd April 2009, 06:19	#8
moonstoneboy Posted a thing or two Rover 75 Connoisseur SE CDT Tourer - naturally in Moonstone Green Join Date: Oct 2007 Location: Surrey - near Gatwick Airport Posts: 1,316 Thanks: 0 Thanked 3 Times in 3 Posts	Thanks for the replies. I had to go out yesterday lunch time and it seemed fine apart from one brief period. The journey home last night was fine so that to me would take me away from the MAF. I have concluded that it must be the underbonnet pump that occassionally decides to go on strike. I have loaded the new one in the car, hopefully I will not have to change it en-route and will change it at my destination. I will also unplug the MAF and see what effect that has - and plan to fit the pieburg (?) and MAFAM. Thanks Paul