Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 6th September 2019, 19:32   #1
david2000
Loves to post
 
Rover 75 Tourer

Join Date: Dec 2007
Location: Ammanford
Posts: 485
Thanks: 248
Thanked 29 Times in 24 Posts
Default rover 75 diesel wont start

hi to all
this morning I started the engine then after 30 seconds it stopped and would not start under bonnet pump is working and good pressure then I asked a friend to give me a hand he came over and he loosened the nut on the common rail and I cranked the engine diesel was coming out then he loosened the nut on the injector I cranked the engine diesel coming out then he suggested connecting another injector to the common rail I had a injector so we connected the injector and cranked the engine nothing so it looks like there is no power going to the injectors can anyone help
david
david2000 is offline   Reply With Quote
Old 6th September 2019, 20:07   #2
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
Default

Dead cam sensor.

PS. Be very, very careful with the high pressure injector feed. Oil can penetrate your skin and kill you.----
COLVERT is offline   Reply With Quote
Old 6th September 2019, 20:12   #3
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Quote:
Originally Posted by david2000 View Post
hi to all
this morning I started the engine then after 30 seconds it stopped and would not start under bonnet pump is working and good pressure then I asked a friend to give me a hand he came over and he loosened the nut on the common rail and I cranked the engine diesel was coming out then he loosened the nut on the injector I cranked the engine diesel coming out then he suggested connecting another injector to the common rail I had a injector so we connected the injector and cranked the engine nothing so it looks like there is no power going to the injectors can anyone help
david
Fault codes? live data? you have a T4, so you will be aware the common rail pressure is circa 19500 KPa while cranking or 2800 P.S.I. and fuel at this pressure will inject through your skin and kill you

So what are the fault codes (if any) and what are the live data figures for the LP and HP side, regulator current etc.

Brian
marinabrian is offline   Reply With Quote
Old 6th September 2019, 21:00   #4
david2000
Loves to post
 
Rover 75 Tourer

Join Date: Dec 2007
Location: Ammanford
Posts: 485
Thanks: 248
Thanked 29 Times in 24 Posts
Default

hi brian
I cant give you live data the engine wont start the fault on the ecu is pre delivery pressure monitoring how can I test to see if there is power going to the injectors
david
david2000 is offline   Reply With Quote
Old 6th September 2019, 21:29   #5
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Engine doesn't need to be running David, LP side must be > than 125Kpa, and the HP side >14000Kpa during cranking.

If the LP is <125KPa, the ECM inhibits injector operation to prevent HP pump damage

Brian
marinabrian is offline   Reply With Quote
Old 6th September 2019, 21:59   #6
david2000
Loves to post
 
Rover 75 Tourer

Join Date: Dec 2007
Location: Ammanford
Posts: 485
Thanks: 248
Thanked 29 Times in 24 Posts
Default

hello Brian
ok so I need to have the overview screen on the t4 then crank the engine and see the readings is this correct I shall try tommorow
I have one question does the camshaft sensor send a signal to the injectors via ecu
david
david2000 is offline   Reply With Quote
Old 6th September 2019, 22:43   #7
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
Default

Your question.----I believe it does.

Brian will have an answer for you tomorrow.---
COLVERT is offline   Reply With Quote
Old 7th September 2019, 07:28   #8
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

Quote:
Originally Posted by david2000 View Post
hello Brian
ok so I need to have the overview screen on the t4 then crank the engine and see the readings is this correct I shall try tommorow
I have one question does the camshaft sensor send a signal to the injectors via ecu
david
The ECM will reference the camshaft sensor signal only at start up and if it doesn't see it then it will not fire the injectors.

For injector timing the ECM uses the crankshaft sensor.






.

Last edited by Mike Noc; 7th September 2019 at 07:33..
Mike Noc is offline   Reply With Quote
Old 7th September 2019, 09:00   #9
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Yes David, as Mike says the CMP is used solely to reference the first injection cycle then is disregarded.

The overview screen should be viewed during the cranking phase to determine the high pressure figures are correct.

I don't know if your T4 is of the variety with a kettle lead connector like this......



If it is, you should power it from the mains to prevent the possibility of signal dropout during cranking.

Brian
marinabrian is offline   Reply With Quote
Old 7th September 2019, 09:46   #10
david2000
Loves to post
 
Rover 75 Tourer

Join Date: Dec 2007
Location: Ammanford
Posts: 485
Thanks: 248
Thanked 29 Times in 24 Posts
Default

hello Brian
I have sent you a photo of my t4 check your email and in the next half hour I will have the info you want
david
david2000 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 13:34.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd