ZT not starting.. urgent help required!

rikk · 27th October 2019, 11:10

Hello,
My MG ZT CDTi has decided it doesn't want to start. It's probably something i've done. I was checking the plenum drain hole, which had some debris in it but nothing too bad, certainly no water. Wish i'd left it alone now!

Anyway now the car won't start. Everything seems to work ok .. but when cranking it just does't start. It was working perfectly fine this morning before i checked the plenum. However i've had a good look at the wiring and nothing appears damaged, and everything is plugged in.

Presumably it's not getting fuel? Any ideas which specific things in that area I should check? If I can't fix it is there anyone in this area (NW Leics, near ashby) that could help? I use the car to get to work so am in trouble if i can't get it working asap!

thankyou :-)

rikk · 27th October 2019, 11:18

Actually.. just been out to check again and the car started. Panic over. Sort of. Because now I don't know why it wasn't starting before, or why it's just started now. So am a bit worried that I might go somewhere and then it will refuse to start. Would be useful to know which wires to check if it won't start.

Also, when in that area I noticed a small plug with two pins that isn't plugged in to anything. Not sure what it's for, maybe an optional extra i don't have on this car? It has a red and a black wire, coming out of a loom in the corner near the passenger side wing in the plenum area.

rikk · 27th October 2019, 11:29

Stopped working again.. i put the covers back and again something must have got disturbed. Definitely something iffy.. need to find out what it is and fix asap..

rikk · 27th October 2019, 11:57

I think it might be the plug on the top of the under bonnet fuel pump.. after i wiggled that a bit then it started... i may have knocked it when removing the plenum cover. Not absolutely sure though, but i've cleaned the connectors in the fuel pump plug as best i can and put a bit of copper grease on. Still worried though. I'm going to run TOAF on it to see if it shows any error codes.

rikk · 27th October 2019, 12:38

TOAF shows a 1260 pre supply pressure montitoring error .. Error not present.. zero RPM. Though from what i've read thats likely to be a red herring as it is a common error?

Yorkshire GOC · 27th October 2019, 13:52

Things that come to mind

Crank sensor -does the tachograph needle move when your turn her over ? If not that points to a crank sensor fault - easy to see next time if she fails to start.

However on a diesel i would also consider injector leak back issues causing intermittent starting issues /stalling issues - you would need to carry out an injector leak back test using the "milk bottle" kit.

Finally after the above 2 is your fuel tank full if less than a third full a failing intank fuel pump can cause intermittent starting problems

COLVERT · 27th October 2019, 15:34

Quote:

Originally Posted by Yorkshire GOC

Things that come to mind

Crank sensor -does the tachograph needle move when your turn her over ? If not that points to a crank sensor fault - easy to see next time if she fails to start.

However on a diesel i would also consider injector leak back issues causing intermittent starting issues /stalling issues - you would need to carry out an injector leak back test using the "milk bottle" kit.

Finally after the above 2 is your fuel tank full if less than a third full a failing intank fuel pump can cause intermittent starting problems

I think you must mean CAM sensor.

richw · 27th October 2019, 15:58

Quote:

Originally Posted by Yorkshire GOC

does the tachograph needle move when your turn her over ? If not that points to a crank sensor fault - easy to see next time if she fails to start.

I have read this in a few places. When I turn the key to start my V6, the rev counter doesn't move at all until the engine actually fires, and it goes straight to about 1000 rpm. It normally starts OK.

Should the needle move a bit as the starter is turning the engine? Or is it a weird diesel thing?!

Sent from my Redmi 4X using Tapatalk

trikey · 27th October 2019, 17:21

Do you have the oil light illuminated when you turn the ign on?

patrolman pete · 27th October 2019, 17:45

Does the under bonnet pump run with the ignition on ? If not give it a tap with the handle of a screwdriver and see if it runs then try to start the engine. This has caught a few diesel owners out !

27th October 2019, 11:10	#1
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	ZT not starting.. urgent help required! Hello, My MG ZT CDTi has decided it doesn't want to start. It's probably something i've done. I was checking the plenum drain hole, which had some debris in it but nothing too bad, certainly no water. Wish i'd left it alone now! Anyway now the car won't start. Everything seems to work ok .. but when cranking it just does't start. It was working perfectly fine this morning before i checked the plenum. However i've had a good look at the wiring and nothing appears damaged, and everything is plugged in. Presumably it's not getting fuel? Any ideas which specific things in that area I should check? If I can't fix it is there anyone in this area (NW Leics, near ashby) that could help? I use the car to get to work so am in trouble if i can't get it working asap! thankyou :-)

27th October 2019, 13:52	#6
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	Things that come to mind Crank sensor -does the tachograph needle move when your turn her over ? If not that points to a crank sensor fault - easy to see next time if she fails to start. However on a diesel i would also consider injector leak back issues causing intermittent starting issues /stalling issues - you would need to carry out an injector leak back test using the "milk bottle" kit. Finally after the above 2 is your fuel tank full if less than a third full a failing intank fuel pump can cause intermittent starting problems __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

27th October 2019, 17:21	#9
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,764 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Do you have the oil light illuminated when you turn the ign on? __________________ Lest we forget..

27th October 2019, 11:18	#2
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	Actually.. just been out to check again and the car started. Panic over. Sort of. Because now I don't know why it wasn't starting before, or why it's just started now. So am a bit worried that I might go somewhere and then it will refuse to start. Would be useful to know which wires to check if it won't start. Also, when in that area I noticed a small plug with two pins that isn't plugged in to anything. Not sure what it's for, maybe an optional extra i don't have on this car? It has a red and a black wire, coming out of a loom in the corner near the passenger side wing in the plenum area.

27th October 2019, 11:29	#3
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	Stopped working again.. i put the covers back and again something must have got disturbed. Definitely something iffy.. need to find out what it is and fix asap..

27th October 2019, 11:57	#4
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	I think it might be the plug on the top of the under bonnet fuel pump.. after i wiggled that a bit then it started... i may have knocked it when removing the plenum cover. Not absolutely sure though, but i've cleaned the connectors in the fuel pump plug as best i can and put a bit of copper grease on. Still worried though. I'm going to run TOAF on it to see if it shows any error codes.

27th October 2019, 12:38	#5
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	TOAF shows a 1260 pre supply pressure montitoring error .. Error not present.. zero RPM. Though from what i've read thats likely to be a red herring as it is a common error?

27th October 2019, 17:45	#10
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Does the under bonnet pump run with the ignition on ? If not give it a tap with the handle of a screwdriver and see if it runs then try to start the engine. This has caught a few diesel owners out !