CDTi auto - some form of limp mode ??

BRG75 · 16th August 2020, 08:54

Just returning from breakfast at a local Toby, and after some 3 miles (whilst still 2 miles from home) turning right on a hill - suddenly limited to about 8 - 10 mph.

When road levelled out, this increased to say 15 mph; on a down hill section got up to about 30 mph.

Car is auto, but holding in 2,3 or 4 made no difference.

Did get home, and once parked up, engine would rev freely to 3k, and sure it would have gone further.

Any suggestions welcomed.

Regards

Mike

Arctic · 16th August 2020, 09:27

Richard.
I would say the MAF is at fault, unplug it and see if it changes the limp mode.

You will have to remove the air filter cover to unplug the MAF, unless you have the mod in the link below.
https://www.the75andztclub.co.uk/for...d.php?t=307029

It may worth doing the access mod above when you have the air filter cover off.

Mike Noc · 16th August 2020, 09:28

Check and clean the LP pressure sensor plug connections - it's the one on top of the fuel filter inboard of the battery.

BRG75 · 16th August 2020, 09:36

Thanks for that,
I'll get onto it later today, and update thread.

I did read about your mod, and made a mental note to do it.
Seem to recall mention of 5 point star driver with security hole in centre.
If i'm right, then I do have a set, from a job I did some years ago.

Thanks again

Mike

sworks · 16th August 2020, 11:54

When the maf failed on my auto it was undriveable, worth disconnecting and see if it makes a difference

BigRuss · 16th August 2020, 13:24

Worth giving the manifold pressure sensor a clean

Russ

BRG75 · 17th August 2020, 13:45

Many thanks to all responders.

It certainly does look like the MAF; it's now still in situ, but unplugged. Car seems fine on a quick burst up the road, and a replacement will be ordered from DMGR, with a 2 yr. warranty.

Ref. undriveable with duff MAF, yes, agreed.
I limped home yesterday, on a warm / hot engine.
This morning, engine cold, engine started OK, but stalled as soon as R or D was selected.

Other suggestions will be carried out, as precautionary, but I always try and only change one thing at a time. Good practise, from my engineering days.

Again, thanks for help.

Regards

Mike

SD1too · 17th August 2020, 15:39

Quote:

Originally Posted by BRG75

... I always try and only change one thing at a time. Good practise, from my engineering days.

Simon

BRG75 · 20th August 2020, 13:32

Pleased to report that new MAF arrived this morning, fitted after lunch and just done a 3 mile test AOK, other than Engine Management Light still on.

I have actually used the car, with MAF unplugged; just local, about 8-10 miles. No apparent issues, other than EML on.

I'm not sure if it will reset itself, in time, or if I need to have it done / buy a code reader and do it myself.

Car still new to me, and towing bracket going on this weekend. This will be my old saloon one from company car in 2000, with hole re-alignment on each fore and aft bracket.

Other tips / recommendations to be carried out at the same time. Arctic's mod was done whilst air filter cover was off.

Thanks for help,

Regards

Mike

Arctic · 20th August 2020, 18:47

Quote:

Originally Posted by BRG75

Pleased to report that new MAF arrived this morning, fitted after lunch and just done a 3 mile test AOK, other than Engine Management Light still on.

I have actually used the car, with MAF unplugged; just local, about 8-10 miles. No apparent issues, other than EML on.

I'm not sure if it will reset itself, in time, or if I need to have it done / buy a code reader and do it myself.

Car still new to me, and towing bracket going on this weekend. This will be my old saloon one from company car in 2000, with hole re-alignment on each fore and aft bracket.

Other tips / recommendations to be carried out at the same time. Arctic's mod was done whilst air filter cover was off.

Thanks for help,

Regards

Mike

HI Mike.
Did EML light come on after unplugging the MAF, if not then you could try unplugging the low pressure connector on the fuel pump squirt it with contact cleaner push it on and off a few times and see if the EML goes out

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16th August 2020, 08:54	#1
BRG75 Gets stuck in Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013 Location: Sevenoaks Posts: 973 Thanks: 670 Thanked 290 Times in 195 Posts	CDTi auto - some form of limp mode ?? Just returning from breakfast at a local Toby, and after some 3 miles (whilst still 2 miles from home) turning right on a hill - suddenly limited to about 8 - 10 mph. When road levelled out, this increased to say 15 mph; on a down hill section got up to about 30 mph. Car is auto, but holding in 2,3 or 4 made no difference. Did get home, and once parked up, engine would rev freely to 3k, and sure it would have gone further. Any suggestions welcomed. Regards Mike __________________ Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000. Last edited by BRG75; 16th August 2020 at 08:56..

16th August 2020, 09:27	#2
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,700 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	Richard. I would say the MAF is at fault, unplug it and see if it changes the limp mode. You will have to remove the air filter cover to unplug the MAF, unless you have the mod in the link below. https://www.the75andztclub.co.uk/for...d.php?t=307029 It may worth doing the access mod above when you have the air filter cover off. __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

16th August 2020, 09:36	#4
BRG75 Gets stuck in Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013 Location: Sevenoaks Posts: 973 Thanks: 670 Thanked 290 Times in 195 Posts	Thanks for that, I'll get onto it later today, and update thread. I did read about your mod, and made a mental note to do it. Seem to recall mention of 5 point star driver with security hole in centre. If i'm right, then I do have a set, from a job I did some years ago. Thanks again Mike __________________ Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000.

16th August 2020, 11:54	#5
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	When the maf failed on my auto it was undriveable, worth disconnecting and see if it makes a difference __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

16th August 2020, 13:24	#6
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	Worth giving the manifold pressure sensor a clean 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.

16th August 2020, 09:28	#3
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: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Check and clean the LP pressure sensor plug connections - it's the one on top of the fuel filter inboard of the battery.

17th August 2020, 13:45	#7
BRG75 Gets stuck in Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013 Location: Sevenoaks Posts: 973 Thanks: 670 Thanked 290 Times in 195 Posts	Many thanks to all responders. It certainly does look like the MAF; it's now still in situ, but unplugged. Car seems fine on a quick burst up the road, and a replacement will be ordered from DMGR, with a 2 yr. warranty. Ref. undriveable with duff MAF, yes, agreed. I limped home yesterday, on a warm / hot engine. This morning, engine cold, engine started OK, but stalled as soon as R or D was selected. Other suggestions will be carried out, as precautionary, but I always try and only change one thing at a time. Good practise, from my engineering days. Again, thanks for help. Regards Mike __________________ Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000.

20th August 2020, 13:32	#9
BRG75 Gets stuck in Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013 Location: Sevenoaks Posts: 973 Thanks: 670 Thanked 290 Times in 195 Posts	Pleased to report that new MAF arrived this morning, fitted after lunch and just done a 3 mile test AOK, other than Engine Management Light still on. I have actually used the car, with MAF unplugged; just local, about 8-10 miles. No apparent issues, other than EML on. I'm not sure if it will reset itself, in time, or if I need to have it done / buy a code reader and do it myself. Car still new to me, and towing bracket going on this weekend. This will be my old saloon one from company car in 2000, with hole re-alignment on each fore and aft bracket. Other tips / recommendations to be carried out at the same time. Arctic's mod was done whilst air filter cover was off. Thanks for help, Regards Mike __________________ Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000. Last edited by BRG75; 20th August 2020 at 13:47..