MG ZT-T diesel losing power

maxemillione · 8th March 2015, 13:30

I've decided to start a new thread to save confusion on this issue.
At the moment, the only problems I have is the amb temp reading being out (will replace the sensor) and more important, the car is still stuttering badly !
It starts fine but intermittently lacks power and stutters.
I've discovered that if I disconnect the fuel rail sensor connector and reconnect, it runs like a dream for anything from 5 minutes to a week.
I took advice and cleaned the connections with halfords contact cleaner and it ran fine for about a week, but then back to stuttering.
Every time it stutters, I disconnect the plug and re-connect and it's instantly fine for however long it chooses..... any ideas would be very much appreciated, my wife is gradually losing confidence in the car and I love it, really don't want to change !

Mickyboy · 8th March 2015, 14:02

I would suggest this is the fuel rail pressure sensor faulty, they are typically faulty more in the freelander for some reason from experience.

It maybe sending a incorrect signal back to the ecu

marinabrian · 8th March 2015, 14:06

Why not have a word with Cossie Dunc

I'm sure he'll get to the bottom of this for you

Brian

rosswalki · 8th March 2015, 17:49

Have you checked the wiring to the fuel rail pressure sensor? I'm a Land Rover tech and I've lost count of how many M47 Freelanders and Range Rovers (TD6) I've seen with this issue. My dad had the same problem on his TD6 and in the end cut out altogether. Got it into work and the wiring had been bodged beofre so we fitted an overlay harness to the ECU and it's been fine ever since. The insulation around the wiring tends to break around an inch from the connector and can get corroded and change the resistance in the wires causing the ECU to receive mixed readings on the fuel pressure. If you have an OBD scanner then try plugging it in and playing about with the wiring to see if the value dramatically changes.

Hope this helps! Rosswalki

8th March 2015, 13:30	#1
maxemillione Newbie rover 75 saloon auto Join Date: Nov 2013 Location: Glasgow Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	MG ZT-T diesel losing power I've decided to start a new thread to save confusion on this issue. At the moment, the only problems I have is the amb temp reading being out (will replace the sensor) and more important, the car is still stuttering badly ! It starts fine but intermittently lacks power and stutters. I've discovered that if I disconnect the fuel rail sensor connector and reconnect, it runs like a dream for anything from 5 minutes to a week. I took advice and cleaned the connections with halfords contact cleaner and it ran fine for about a week, but then back to stuttering. Every time it stutters, I disconnect the plug and re-connect and it's instantly fine for however long it chooses..... any ideas would be very much appreciated, my wife is gradually losing confidence in the car and I love it, really don't want to change !

8th March 2015, 14:02	#2
Mickyboy This is my second home MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	I would suggest this is the fuel rail pressure sensor faulty, they are typically faulty more in the freelander for some reason from experience. It maybe sending a incorrect signal back to the ecu __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE]

8th March 2015, 14:06	#3
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Why not have a word with Cossie Dunc I'm sure he'll get to the bottom of this for you Brian

8th March 2015, 17:49	#4
rosswalki Regular poster MG ZT 190+, MG ZT 190 SE Join Date: Apr 2014 Location: Harrogate Posts: 72 Thanks: 7 Thanked 7 Times in 7 Posts	Have you checked the wiring to the fuel rail pressure sensor? I'm a Land Rover tech and I've lost count of how many M47 Freelanders and Range Rovers (TD6) I've seen with this issue. My dad had the same problem on his TD6 and in the end cut out altogether. Got it into work and the wiring had been bodged beofre so we fitted an overlay harness to the ECU and it's been fine ever since. The insulation around the wiring tends to break around an inch from the connector and can get corroded and change the resistance in the wires causing the ECU to receive mixed readings on the fuel pressure. If you have an OBD scanner then try plugging it in and playing about with the wiring to see if the value dramatically changes. Hope this helps! Rosswalki