Yet another non starting diesel

KSM62 · 17th March 2018, 12:13

Rover 75 2.0 CDT 76k

I should preface this post with the info that I misfuelled the car about 3yrs ago on the M4 and ended up driving it for about 20 miles home, so I've been waiting for something to fail since. However in the last 3 yrs I've not had a single problem with the car until last week during all the snow when it wouldnt start one evening after work.

Using the great advice on this forum I have taken the under bonnet voltage measurements suggested by French Mike. I have checked the IT pump and it is running. The UB pump doesnt seem to run until I give it a tap. The car fires up for about 1 sec with Easy start but wont run. Crankshaft sensor appears to be OK as I see the rev counter reading 100rpm whilst cranking. Outside air temp today is -1.

Camsensor disconnected = 12v ign on, 9-10V cranking. Same readings when reconnected, cranking 8-9V.
Signal voltage between Yellow/green and Black/purple wire on filter = 1.25V.
Signal voltage between Purple/green and Black/purple wire on filter = 5V
High pressure fuel rail = 3.77V between pin1 and pin2 Blue/black and Green/brown wires.
Green/purple ECU 5V.

Does this point to a LP fault, maybe UB pump which need a tap to get it to run, even though doing this still won't start the car?

Thanks for any help diagnosing this problem.

Rogue · 17th March 2018, 12:35

Sounds like the Ubp to me... Mine went in exactly the same way.

Amsca2 · 17th March 2018, 12:44

If you tap it so that it's running a few times and make sure its self bled and primed. I'd definitely be doing the ub pump and reason it might not still be starting Is it needing to prime first. Fixed ravs one this way after his recovery company gave up.

So key in get pump running then turn off once pump has primed but don't try to start it. Repeat a few times and then try starting. A little bit like heating glow plugs a few times before starting in extreme cold.

KSM62 · 17th March 2018, 13:49

Ok so primed 4 times and it still wouldnt start

. Tried again and whey hey, thar she blows.

So at least I've been able to move it out of the way of my other cars. Presumably this means a new UB pump. What are my best options? Rimmer? Ebay? I've read about the dubious quality of some of the cheaper pumps.

Many thanks

COLVERT · 17th March 2018, 13:59

If you want to do a proper THANKS just click on the thanks tab, bottom right on the other guys post...--

Amsca2 · 17th March 2018, 14:00

Woop woop. And that's me out as I've never bought one. Just know they need time to self bleed or prime sometimes when fuels been allowed to run back.

Good luck.

Arctic · 17th March 2018, 14:43

Quote:

Originally Posted by KSM62

Ok so primed 4 times and it still wouldnt start

. Tried again and whey hey, thar she blows.

So at least I've been able to move it out of the way of my other cars.

Quote:

Presumably this means a new UB pump. What are my best options? Rimmer? Ebay? I've read about the dubious quality of some of the cheaper pumps.

Many thanks

Hi Keith.
First go for a pierburg UBP, also make sure you are getting a pierburg and not one that is trying to be one.
12v 16.14.6-751867

There is also the TI Automotive
WBQ100 482 MG ROVER
7.50060.00

If you go down the cheap route remember buy cheap buy twice.

There is also

https://www.ebay.co.uk/itm/ROVER-75-...YAAOxyOM5Ra4hh

https://www.ebay.co.uk/itm/PIERBURG-...IAAOSwubRXGgYK

https://www.ebay.co.uk/itm/1x-PIERBU...AAAOSwna1ZxIAQ

You could also check euro car parts & use the code PAT75 and or the code from here? but as I say double check from where ever you purchase, ask questions about the part codes

KSM62 · 17th March 2018, 16:40

Sorry I dont see this anywhere

KSM62 · 17th March 2018, 16:46

Thanks have ordered a Pierburg and filter from Eurocarparts with code. Cosxt a bit more but means I can fit on Mon and test before a 200 mile round trip on Fri. Will double check with counter staff when I pick up on Mon.

KSM62 · 17th March 2018, 19:27

oops, re #8, I don't see the Thanks tab.
Cheers anyway

17th March 2018, 12:13	#1
KSM62 Newbie Rover 75 Tourer Join Date: Nov 2017 Location: bristol Posts: 29 Thanks: 2 Thanked 0 Times in 0 Posts	Yet another non starting diesel Rover 75 2.0 CDT 76k I should preface this post with the info that I misfuelled the car about 3yrs ago on the M4 and ended up driving it for about 20 miles home, so I've been waiting for something to fail since. However in the last 3 yrs I've not had a single problem with the car until last week during all the snow when it wouldnt start one evening after work. Using the great advice on this forum I have taken the under bonnet voltage measurements suggested by French Mike. I have checked the IT pump and it is running. The UB pump doesnt seem to run until I give it a tap. The car fires up for about 1 sec with Easy start but wont run. Crankshaft sensor appears to be OK as I see the rev counter reading 100rpm whilst cranking. Outside air temp today is -1. Camsensor disconnected = 12v ign on, 9-10V cranking. Same readings when reconnected, cranking 8-9V. Signal voltage between Yellow/green and Black/purple wire on filter = 1.25V. Signal voltage between Purple/green and Black/purple wire on filter = 5V High pressure fuel rail = 3.77V between pin1 and pin2 Blue/black and Green/brown wires. Green/purple ECU 5V. Does this point to a LP fault, maybe UB pump which need a tap to get it to run, even though doing this still won't start the car? Thanks for any help diagnosing this problem.

17th March 2018, 12:35	#2
Rogue I really should get out more....... 75 CDT SE 160 Saloon Join Date: May 2017 Location: Thorpe St Andrew, Norwich Posts: 2,725 Thanks: 1,386 Thanked 1,096 Times in 774 Posts	Sounds like the Ubp to me... Mine went in exactly the same way. __________________ Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT

17th March 2018, 12:44	#3
Amsca2 Gets stuck in MG ZT-T cdti Join Date: Aug 2015 Location: Grangemouth Posts: 521 Thanks: 60 Thanked 93 Times in 80 Posts	If you tap it so that it's running a few times and make sure its self bled and primed. I'd definitely be doing the ub pump and reason it might not still be starting Is it needing to prime first. Fixed ravs one this way after his recovery company gave up. So key in get pump running then turn off once pump has primed but don't try to start it. Repeat a few times and then try starting. A little bit like heating glow plugs a few times before starting in extreme cold. __________________ The Typhoon Bull Last edited by Amsca2; 17th March 2018 at 12:48.. Reason: Edit

17th March 2018, 13:49	#4
KSM62 Newbie Rover 75 Tourer Join Date: Nov 2017 Location: bristol Posts: 29 Thanks: 2 Thanked 0 Times in 0 Posts	Ok so primed 4 times and it still wouldnt start. Tried again and whey hey, thar she blows. So at least I've been able to move it out of the way of my other cars. Presumably this means a new UB pump. What are my best options? Rimmer? Ebay? I've read about the dubious quality of some of the cheaper pumps. Many thanks

17th March 2018, 14:00	#6
Amsca2 Gets stuck in MG ZT-T cdti Join Date: Aug 2015 Location: Grangemouth Posts: 521 Thanks: 60 Thanked 93 Times in 80 Posts	Woop woop. And that's me out as I've never bought one. Just know they need time to self bleed or prime sometimes when fuels been allowed to run back. Good luck. __________________ The Typhoon Bull

17th March 2018, 13:59	#5
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	If you want to do a proper THANKS just click on the thanks tab, bottom right on the other guys post...--

17th March 2018, 16:40	#8
KSM62 Newbie Rover 75 Tourer Join Date: Nov 2017 Location: bristol Posts: 29 Thanks: 2 Thanked 0 Times in 0 Posts	Sorry I dont see this anywhere

17th March 2018, 16:46	#9
KSM62 Newbie Rover 75 Tourer Join Date: Nov 2017 Location: bristol Posts: 29 Thanks: 2 Thanked 0 Times in 0 Posts	Thanks have ordered a Pierburg and filter from Eurocarparts with code. Cosxt a bit more but means I can fit on Mon and test before a 200 mile round trip on Fri. Will double check with counter staff when I pick up on Mon.

17th March 2018, 19:27	#10
KSM62 Newbie Rover 75 Tourer Join Date: Nov 2017 Location: bristol Posts: 29 Thanks: 2 Thanked 0 Times in 0 Posts	oops, re #8, I don't see the Thanks tab. Cheers anyway