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NineT

Member Since: 12 May 2021
Location: England
Posts: 7

Engine stalls

Out at the weekend and the 90 started to cut out, immediate loss of power and revs to zero, not like running out of petrol. Stopped, and then re-started 1st time only to repeat 4X on the way home (10 mins drive). Has anyone had this happen to them?

23rd Jul 2024 6:43pm

Mdm

Member Since: 11 Sep 2013
Location: Sunny Lancashire
Posts: 1601

would help folk if you told us what model 90 it is? tdi td5 puma?

23rd Jul 2024 8:57pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1060

2002 Defender 110 Td5 DCPU Chawton White

Well it's in the V8 forum.

Revs dropping to 0 fast on the rev counter indicates ignition issues I would start there. What is 3.9 GEMS?

24th Jul 2024 5:18am

BaronDefenders

Member Since: 28 Jun 2019
Location: London/Cotswolds
Posts: 896

2004 Defender 90 Td5 CSW Santorini Black

Carb or injection?

As above, it sounds like it could be electrical if the engine is cutting out but will re-start.

It could be a breakdown of the ignition when under-bonnet temperatures are high. I had this on an 80”. Charlie

1949 Series 1 80 (SOLD)
2002 Td5 90 (SOLD)
2008 Freelander 2 (SOLD)

1958 Series 2 88 Pastel Green (2019 LR Legends Best Restored)
1983 V8 110 Limestone (Previously owned by Tom Sheppard MBE)
2004 Td5 90 Santorini Black (Td5INSIDE Powered & Rebuilt by CSK)
2012 Puma 110 Zermatt Silver (Overlanding Build)

Instagram: @BaronDefenders

24th Jul 2024 5:26am

NineT

Member Since: 12 May 2021
Location: England
Posts: 7

Thanks for the responses.
It’s a 4.0 Gems v8 auto, 90

25th Jul 2024 2:48pm

discomog

Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2527

2015 Defender 90 Puma 2.2 XS CSW Santorini Black

Question - have you had the vehicle a long time or have you just acquired it. The Lucas-Sagem GEMS ECU is quite a complex system. Has it been rechipped at any time? If the ECU has been rechipped in an attempt to "hide" a fault it will try to compensate for this but could well cause other faults to develop.

With the engine warm if you start the vehicle, watch the idle speed -is it normal or slightly high? If it is slightly high and then drops back to normal, this is the ECU sensing a fault and then setting the best idle speed to compensate for any fault. If this happens the fault is likely to be within the ECU. Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8

26th Jul 2024 10:17am

NineT

Member Since: 12 May 2021
Location: England
Posts: 7

Hi Discomog,

I’ve had it some some time, 4+ years. I’m not aware of it being chipped, it was not sold as chipped.
I’ll watch the idle speed this weekend when it’s warm. If the fault is with the ECU are there specialists who can repair? Thanks

26th Jul 2024 11:29am

discomog

Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2527

ATC Drivetrain UK, Bluehawk Electronics and RPI Engineering. I've not used them but these are companies that I know a number of Morgan Plus 8 owners have used for ECU testing and repair. Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8

26th Jul 2024 2:08pm

Rupert605

Member Since: 27 Dec 2020
Location: Royal Wootton Bassett
Posts: 12

1998 Defender 90 V8 Petrol 50th Auto Atlantis Blue

Do you have access to a Nanocom to check for any fault codes? Where are you based? Defender 50th GB165
Discovery 200 Tdi 1990 (gone)

27th Jul 2024 10:40am

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1060

NineT wrote:
Hi Discomog,

I’ve had it some some time, 4+ years. I’m not aware of it being chipped, it was not sold as chipped.
I’ll watch the idle speed this weekend when it’s warm. If the fault is with the ECU are there specialists who can repair? Thanks

I don't know about the GEMS (I have a P38 4.6 with the Bosch system), but I would suspect your ignition coils before the ECU.

27th Jul 2024 11:46am

chazza

Member Since: 02 Dec 2010
Location: Channel Islands
Posts: 11

Best person to solve GEMS issues is Mark Adams at Tornado Systems. You can buy cheap OBD2 scanners these days that will help with diagnosis rather than just changing parts and hoping for the best.

2nd Aug 2024 8:03am

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