CDTi MGZT dies at 1000 revs.

bobby1951 · 30th August 2018, 12:20

Hello I need help please, my MGZT 1951cc Tourer was recovered to a Garage in B'Ham now starts perfect, prior to breakdown the vehicle run faultless now only ticks over and the revs to 950-1000 then cuts out, it seems like the injectors cut out. AA could not find fault garage cannot get it reving.
The car starts perfect its the BMW engine and the car is in excellent condition, ticks over perfect,then will gently rev to 1000 and then engine stops.I have car back home now everything has been replaced but still only tick over, help urgently needed. No codes now showing the original fault was when AA plugged in reader P0087 and P1089. Car is 2005 Reg. Regards,Rob.

stevestrat · 30th August 2018, 15:20

Both fault codes are generic, not model specific:
P0087 - Fuel Rail/System Pressure - Too Low
P1089 - may be a red herring as it refers to an oxygen sensor which the diesels don't have!

This might help:

Quote:

Originally Posted by BigRuss

There are no O2 sensors on the diesel models

Common problem when using a obd scanner is that it will not see some codes or wrongly report others.

If the MIL has come on it's down to either fuel pressure related or a badly out of spec maf,these are the two main culprits, the most likely from the symptoms decribed being the fuel pressure.

When the fuel pressure drops the ecu will cut the amount of fuelling to the injectors to protect the HP pump from damage. The engine will be unable to rev or may even cut out completely and will not be able to start until there is sufficient fuel pressure. If intermittant then more likely to be an electrical related issue, sticking in-tank pump, pressure sensor on the filter head or HP fuel rail sensor.

Russ

Mickyboy · 30th August 2018, 15:25

Fuel pressure issue I recon mate, get a live reading for the fuel pressure at the low side needs to be around 3.6bar for a two pump system or 4+ bar on a single, you will probably find it somewhere around 1.4/1.5 bar
Mick

Mike Noc · 30th August 2018, 16:22

Also check that the EGR valve isn't stuck open.

wullie480 · 30th August 2018, 17:24

Give unplugging the maf a go as well.

Low fuel pressure probably logged as the car is cutting out.

Mike Noc · 30th August 2018, 19:40

Maybe but then again maybe not - you can get a low fuel pressure fault logged if you let the LP pumps time out before starting the engine.

OP mentioned the fault hasn't come back on since being cleared so could be another red herring.

Best way to check is to measure the pressures as Mickyboy said.

.

30th August 2018, 12:20	#1
bobby1951 Newbie MG ZT CDTI Join Date: Aug 2018 Location: Birmingham Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	CDTi MGZT dies at 1000 revs. Hello I need help please, my MGZT 1951cc Tourer was recovered to a Garage in B'Ham now starts perfect, prior to breakdown the vehicle run faultless now only ticks over and the revs to 950-1000 then cuts out, it seems like the injectors cut out. AA could not find fault garage cannot get it reving. The car starts perfect its the BMW engine and the car is in excellent condition, ticks over perfect,then will gently rev to 1000 and then engine stops.I have car back home now everything has been replaced but still only tick over, help urgently needed. No codes now showing the original fault was when AA plugged in reader P0087 and P1089. Car is 2005 Reg. Regards,Rob.

30th August 2018, 15:25	#3
Mickyboy SERVICING AND DEALER DIAGNOSTICS 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	Fuel pressure issue I recon mate, get a live reading for the fuel pressure at the low side needs to be around 3.6bar for a two pump system or 4+ bar on a single, you will probably find it somewhere around 1.4/1.5 bar Mick __________________ [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]

30th August 2018, 17:24	#5
wullie480 This is my second home 1 Join Date: Dec 2010 Location: Banned Posts: 5,195 Thanks: 528 Thanked 1,022 Times in 786 Posts	Give unplugging the maf a go as well. Low fuel pressure probably logged as the car is cutting out. __________________ [SIGPIC][/SIGPIC]

30th August 2018, 19:40	#6
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,551 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Maybe but then again maybe not - you can get a low fuel pressure fault logged if you let the LP pumps time out before starting the engine. OP mentioned the fault hasn't come back on since being cleared so could be another red herring. Best way to check is to measure the pressures as Mickyboy said. . Last edited by Mike Noc; 30th August 2018 at 19:42..

30th August 2018, 16:22	#4
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,551 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Also check that the EGR valve isn't stuck open.