New owner with MG ZT cdti problem

smudge · 27th March 2015, 16:18

Hello all. Love this car but am having a real brain drain of a problem. Been searching this forum for a few days now and still haven't found a cure.
This thread here had exactly the same problem with the same fault codes...but there was no conclusion ?
http://www.the75andztclub.co.uk/foru...d.php?t=168042

Whenever a friend of mine plugs in his laptop/diagnostics and we go for a drive so that he can see what's happening, the damn fault doesn't appear

Every other time I drive the car the problem shows itself within a couple of miles...stop,turn off the engine,turn back on ant it goes fine again for a while.
Tried all of the checks made in the other thread with the same results.
One thing I did notice while I was checking it just now,was when you turn the ignition on and put your ear to the open filler cap the pump sounds like it's 'gurgling' ? Also it seems someone has fitted a non return valve between the UB pump and the fuel filter ?

Any help would be much appreciated .

smudge · 27th March 2015, 17:30

Just wondering...if the in tank pump had previously packed up causing difficulty starting in the morning, would fitting a non return valve in the fuel line mask this problem but leaving the under bonnet pump to do all the work resulting in fuel starvation.....thus leading to the problem that I have with the loss of power?
My car doesn't smoke and otherwise runs very sweetly.

Jurassicc · 28th March 2015, 06:30

disconnect the pump under the bonnet (pop off the power connector)
open the o/s rear door and put your ear on the back seat, the pump is on the o/s of the tank.
Get a helper to turn the ignition on 2. See if you can hear the pump start and try to prime the system.

The wifes 01 CDT has had fuel starvation problems twice now. Both times it was in-tank pump failure.
I changed them both and kept the front one as a spare. Did them last summer used GEARMAX OE ones from ebay.
~£35 each.

When I took the battery tray out to change the front one. I noticed that the clutch slave cylinder had been changed at some point and the metal pipe had not been routed correctly / clipped in place it had been rubbing on the fuel pipe and had made a pin hole leak in it.
Which had been slowly dripping onto the ABS ECU... Yuk
I changed all the black pipes and clips. A meter of diesel pipe was enough.

smudge · 28th March 2015, 09:45

Thanks for that.I shall give it a go.

smudge · 28th March 2015, 14:57

Right. I had the chance to give it a longer run today and found that when it did it's thing and lost power, if I hit the kickdown and managed to get the revs up to 3 1/2-4k the power chimes back in for a while.....works every time!
Any ideas?

smudge · 29th March 2015, 11:41

I'm now starting to wonder if it has sticking Variable vanes in the Turbo.......the extra boost pressure of the higher revs temporarily un seizing them?

suffolk boy · 29th March 2015, 11:43

Quote:

Originally Posted by smudge

I'm now starting to wonder if it has sticking Variable vanes in the Turbo.......the extra boost pressure of the higher revs temporarily un seizing them?

i doubt it i do not think the rover turbo is fitted with them

smudge · 29th March 2015, 20:27

My mistake...ooops!
Possibly the boost sensor?

Juego · 29th March 2015, 20:30

Unplug the maf and try that. If that helps the maf is at fault

smudge · 30th March 2015, 11:38

That was the first thing I looked at......no change with the MAF disconnected.

27th March 2015, 16:18	#1
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	New owner with MG ZT cdti problem Hello all. Love this car but am having a real brain drain of a problem. Been searching this forum for a few days now and still haven't found a cure. This thread here had exactly the same problem with the same fault codes...but there was no conclusion ? http://www.the75andztclub.co.uk/foru...d.php?t=168042 Whenever a friend of mine plugs in his laptop/diagnostics and we go for a drive so that he can see what's happening, the damn fault doesn't appear Every other time I drive the car the problem shows itself within a couple of miles...stop,turn off the engine,turn back on ant it goes fine again for a while. Tried all of the checks made in the other thread with the same results. One thing I did notice while I was checking it just now,was when you turn the ignition on and put your ear to the open filler cap the pump sounds like it's 'gurgling' ? Also it seems someone has fitted a non return valve between the UB pump and the fuel filter ? Any help would be much appreciated .

28th March 2015, 06:30	#3
Jurassicc Regular poster MK1 Rover 75 Tourer Club CDT & MK2 Rover 75 Tourer Conny CDTi Join Date: Mar 2015 Location: Taunton Posts: 35 Thanks: 6 Thanked 5 Times in 3 Posts	disconnect the pump under the bonnet (pop off the power connector) open the o/s rear door and put your ear on the back seat, the pump is on the o/s of the tank. Get a helper to turn the ignition on 2. See if you can hear the pump start and try to prime the system. The wifes 01 CDT has had fuel starvation problems twice now. Both times it was in-tank pump failure. I changed them both and kept the front one as a spare. Did them last summer used GEARMAX OE ones from ebay. ~£35 each. When I took the battery tray out to change the front one. I noticed that the clutch slave cylinder had been changed at some point and the metal pipe had not been routed correctly / clipped in place it had been rubbing on the fuel pipe and had made a pin hole leak in it. Which had been slowly dripping onto the ABS ECU... Yuk I changed all the black pipes and clips. A meter of diesel pipe was enough. Last edited by Jurassicc; 28th March 2015 at 06:41..

28th March 2015, 14:57	#5
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	Right. I had the chance to give it a longer run today and found that when it did it's thing and lost power, if I hit the kickdown and managed to get the revs up to 3 1/2-4k the power chimes back in for a while.....works every time! Any ideas? Last edited by smudge; 28th March 2015 at 17:42..

27th March 2015, 17:30	#2
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	Just wondering...if the in tank pump had previously packed up causing difficulty starting in the morning, would fitting a non return valve in the fuel line mask this problem but leaving the under bonnet pump to do all the work resulting in fuel starvation.....thus leading to the problem that I have with the loss of power? My car doesn't smoke and otherwise runs very sweetly.

28th March 2015, 09:45	#4
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	Thanks for that.I shall give it a go.

29th March 2015, 11:41	#6
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	I'm now starting to wonder if it has sticking Variable vanes in the Turbo.......the extra boost pressure of the higher revs temporarily un seizing them?

29th March 2015, 20:27	#8
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	My mistake...ooops! Possibly the boost sensor?

29th March 2015, 20:30	#9
Juego Gets stuck in Skoda Superb Join Date: Oct 2011 Location: Hamilton Posts: 691 Thanks: 212 Thanked 96 Times in 85 Posts	Unplug the maf and try that. If that helps the maf is at fault

30th March 2015, 11:38	#10
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	That was the first thing I looked at......no change with the MAF disconnected.