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 12th February 2021, 03:05   #11
fabian
Regular poster
 
Rover 75 Saloon

Join Date: Feb 2010
Location: Brisbane
Posts: 56
Thanks: 1
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by SD1too View Post
That's very strange. Can you tell me exactly how you tested them please Richard?

Simon

I may not do it correctly, could you please advise the procedure of how to test them??

https://www.dropbox.com/s/ydmsnanxqs...71_15.jpg?dl=0

Also, I'm a little bit confused about what the coils are. It's the red one or the blue one. We tested the red plug
fabian is offline   Reply With Quote
Old 12th February 2021, 03:09   #12
fabian
Regular poster
 
Rover 75 Saloon

Join Date: Feb 2010
Location: Brisbane
Posts: 56
Thanks: 1
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by bl52krz View Post
Have you tried the sensor on the end of the common rail? I believe that if that is malfunctioning it will not start. I am not sure if this affects the actual firing of the coils, but I imagine it will. Perhaps Marianabrian will be along shortly to answer that.
Please advise where the sensor is. Many thanks
fabian is offline   Reply With Quote
Old 12th February 2021, 08:30   #13
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by fabian View Post
Also, I'm a little bit confused about what the coils are. It's the red one or the blue one. We tested the red plug
Hello Richard,

The item which you've circled in red, and which you now say you've tested, is a sparking plug. The item circled in blue is an ignition coil.

To test a sparking plug it must be unscrewed and, with its lead reconnected, laid on a conductive and earthed part of the engine so that the plug body makes good electrical contact. The engine is then cranked briefly and a spark should then be seen between the centre electrode and one or more of the side electrodes. Make sure that you don't do the test in bright sunlight!

So is that what you did Richard and you saw no spark?

As I said earlier, you should not hesitate to check the fuel filter for loosening ("fuel filter syndrome" or FFS).

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.

Last edited by SD1too; 12th February 2021 at 08:33..
SD1too is offline   Reply With Quote
Old 12th February 2021, 11:09   #14
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Quote:
you should not hesitate to check the fuel filter for loosening
Agreed. I have a compelling but unverified suspicion that FFS inhibits the sparks. I've long suspected it's the ECU's response to low fuel pressure and is logical. I picked up on this when FFS first appeared almost twenty years ago, but I can't recall anyone specifically making the sparks connection. However, everything I've read here is in line with this proposal. Quod erat faciendum if you will. It seems inevitable then, that an examination of the fuel filter is necessary. For sure, the way this problem first appeared is classic FFS.

TC

Last edited by T-Cut; 14th February 2021 at 21:22..
T-Cut is offline   Reply With Quote
Old 12th February 2021, 11:28   #15
fabian
Regular poster
 
Rover 75 Saloon

Join Date: Feb 2010
Location: Brisbane
Posts: 56
Thanks: 1
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by SD1too View Post
Hello Richard,

The item which you've circled in red, and which you now say you've tested, is a sparking plug. The item circled in blue is an ignition coil.

To test a sparking plug it must be unscrewed and, with its lead reconnected, laid on a conductive and earthed part of the engine so that the plug body makes good electrical contact. The engine is then cranked briefly and a spark should then be seen between the centre electrode and one or more of the side electrodes. Make sure that you don't do the test in bright sunlight!

So is that what you did Richard and you saw no spark?

As I said earlier, you should not hesitate to check the fuel filter for loosening ("fuel filter syndrome" or FFS).

Simon
Hi Simon,

Thanks for the clarification and yes that is what I did and saw no spark. The roadside assistant also did the same test but use their own taster (looks like a gun with an indicator ) before towing the car.

Could you please guide me to test ignition coils?

thx

Richard
fabian is offline   Reply With Quote
Old 12th February 2021, 12:27   #16
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by fabian View Post
Could you please guide me to test ignition coils?
Hi Richard,

All you can practically do with the ignition coils is to (1) check the DC resistance of the primary winding and (2) ensure that a 12v supply is reaching the connector.

To measure the primary winding resistance remove the connector and place your meter between the coil terminals 1 and 3. It should read 0.77Ω ± 0.08Ω but don't be too precise about it!

The supply appears on connector pin 1 (brown/pink wire) from fuse 2 in the engine compartment fusebox. Use the battery negative terminal as your earth.

Please report back with your findings for all three left-hand bank cylinders.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 13th February 2021, 09:18   #17
fabian
Regular poster
 
Rover 75 Saloon

Join Date: Feb 2010
Location: Brisbane
Posts: 56
Thanks: 1
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by SD1too View Post
Hi Richard,

All you can practically do with the ignition coils is to (1) check the DC resistance of the primary winding and (2) ensure that a 12v supply is reaching the connector.

To measure the primary winding resistance remove the connector and place your meter between the coil terminals 1 and 3. It should read 0.77Ω ± 0.08Ω but don't be too precise about it!

The supply appears on connector pin 1 (brown/pink wire) from fuse 2 in the engine compartment fusebox. Use the battery negative terminal as your earth.

Please report back with your findings for all three left-hand bank cylinders.

Simon
Is there another way to test without meter as I don't have a one?
fabian is offline   Reply With Quote
Old 13th February 2021, 10:20   #18
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by fabian View Post
Is there another way to test without meter as I don't have one?
O.K.

Forget about the spark for now and concentrate on the fuel filter because your symptoms suggest that it's separated. There's a knack to lifting the rear seat cushion and you'll find some tips hiding on the forum. The filter's on the left hand side and secured with a large ring. Don't undo any connections but carefully lift the filter canister just enough to check that it is tight. Photographs of this have been posted. Do not separate the filter assembly. If there is no clip fitted, order one!

Please make a start on that Richard and come back to us if you meet any problems.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 13th February 2021, 16:30   #19
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by bl52krz View Post
On the end of it, passenger side, there is a sensor. Pull this out and see if there is any white residue on the connections.
Hi David,

Are you sure that you're not thinking of the HP fuel sensor on your diesel?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 13th February 2021, 21:24   #20
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

Quote:
Originally Posted by fabian View Post
Is there another way to test without meter as I don't have a one?
A meter is not expensive and a really useful bit of kit for testing a variety of things on the car.

You might have this pic. Clip on fuel filter.
Attached Images
File Type: jpg Clip on fuel filter.jpg (17.9 KB, 18 views)
COLVERT 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 06:54.


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