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MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

2009 Defender 110 Puma 2.4 SW Alpine White

Engine power loss and Pre 14th October 2009 faulty ECU's

I'm looking for your help in finding what's wrong in my defender 110 Td4 MY09

While you drive on road or offroad the engine suddently start to loose power and change noise and after few second the engine turn off by itself.

If you immediately try to restart, the engine will refuse to start. I always need to wait 2 minutes and then the engine start and run without problem. Sometime you can drive without problem for many km's and sometime after few minutes the problem are back again.

I was pretty sure that the MAF sensor (the one near the vacuum pump) was is some way faulty but today, after MAF replacement the problem are back again.

I see that my ECU was built in June 2008. I read that Pre 14th October 2009 ECU's could be defective.
Do you think a problem like mine could be related to a faulty ECU's ?

Thanking in advance for any help attempt!

29th Sep 2012 5:17pm

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

Could be but you need to get it plugged in - there is a specific code which tells you if the ECU is faulty.

TBH, your issue sounds more like a fuel or fuel supply issue.

30th Sep 2012 8:16pm

MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

Thanks for your help attempt, now the the defender is in assistance and hopefully during the last fault some DTC was logged. I will keep you informed.

1st Oct 2012 6:03am

robharvey

Member Since: 14 Dec 2009
Location: Durban
Posts: 86

I was told by my dealer that if you have a faulty ECU your vehicle will "hiccup", which doesn't seem to be the problem here.

1st Oct 2012 6:45am

MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

What does "hiccup" mean ?

About a possible fuel problem, I agree but the thing that I cannot explain is that if you try to restart the engine immediately after failure it refuse to start but if you wait a couple of minutes it then restart without problem.

1st Oct 2012 7:32am

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Without connecting it to a diagnostic tool and getting access to the codes we could 'best guess' all day what may or may not be wrong and come up with a list a mile long of 'possibilities.' The full Ford DTC list of codes runs into nearly 100 pages of A4.

Let us know what they come up with.

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

1st Oct 2012 7:43am

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

Mario, replied to your email..

MD5 wrote:
What does "hiccup" mean ?

About a possible fuel problem, I agree but the thing that I cannot explain is that if you try to restart the engine immediately after failure it refuse to start but if you wait a couple of minutes it then restart without problem.

If the fuel filter inlet ports where contaminated with detritus from the tank then fuel starvation would result in the engine shutting down. It would not restart again due to the residual vacuum from the pump holding the detritus in place which caused the fuel starvation in the first place. Once the vacuum rescinded then the detritus would settle back down allowing the fuel to flow again, until it blocked the ports again that is, and the process was repeated.

Brian.

1st Oct 2012 10:07am

robharvey

Member Since: 14 Dec 2009
Location: Durban
Posts: 86

MD5 wrote:
What does "hiccup" mean ?

Stutter.

1st Oct 2012 11:13am

MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

Thanks for "hiccup" term explanation!

I'm unable to contact the guy that is trying to cure my Puma so I don't have updates about any stored DTC's, I will to contact him today.

In the meantime I made the request to clean the fuel supply feed as Brian suggested. Thanks all again for the help attempt!

2nd Oct 2012 5:10am

ellebarto

Member Since: 05 Oct 2012
Location: Manchester
Posts: 334

2009 Defender 110 Puma 2.4 XS CSW Zambezi Silver

Re: Engine power loss and Pre 14th October 2009 faulty ECU's

MD5 wrote:
I'm looking for your help in finding what's wrong in my defender 110 Td4 MY09

While you drive on road or offroad the engine suddently start to loose power and change noise and after few second the engine turn off by itself.

If you immediately try to restart, the engine will refuse to start. I always need to wait 2 minutes and then the engine start and run without problem. Sometime you can drive without problem for many km's and sometime after few minutes the problem are back again.

I was pretty sure that the MAF sensor (the one near the vacuum pump) was is some way faulty but today, after MAF replacement the problem are back again.

I see that my ECU was built in June 2008. I read that Pre 14th October 2009 ECU's could be defective.
Do you think a problem like mine could be related to a faulty ECU's ?

Thanking in advance for any help attempt!

No help to you mate at all but I'm having exactly the same problem. Having had it on diagnostics there are no obvious fault codes but if you look very deep into the code it reports loss of contact to the ECU. Thats where I come unstuck because I cant find any reference to that anywhere so I'm not sure what the fix would be!

5th Oct 2012 10:00pm

MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

Just some update about my issue.

I ask many time that some one tell me which are the DTC stored in the ECU but no way to have it. The only thing I know is that they are DTC's that don't give much help in troubleshooting the problem.

LR assistance had replaced the turbo, I'm very skeptical that the turbo could be the cause of the issue.
They also replaced the breathing valve over the fuel tank and both the feeding between tank and fuel filter because the quick release coupling was both degraded. The car will be hopefully ready around mid of the next week.

@ellebarto: The loss of contact with the ECU is a problem often related to the main-relay/socket/cable-harness there are a technical bulletin about this problem that is often but not always related to water temperature needle in the red zone. Also check the black wire connected to the ignition lock, squeeze it with a pliers.

6th Oct 2012 6:43am

MD5

Member Since: 02 May 2011
Location: Italy
Posts: 143

Just an update about my power loss + engine shutoff random failure.

Fuel tank and fuel feed lines was cleaned from a kind of dark brown mud that is certain situation dont allow a proper fuel bleeding.

Since my 110 was covered by warranty (now it's expired), LR assistance prefer to replace the Turbo and the EGR valve.

At the moment the engine run very fine also thanks to the new EGR (I think it's an improved version).

I would like to express my gratitude to Brian (Lorryman100) for the great assistance offered in troubleshooting the problem.

At the moment I'm more than happy, I would like to drive another 400/500km to be 100% sure that the random failure is gone (hopefully) forever.

21st Oct 2012 4:33pm

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

Glad it worked out OK for you Mario

PS, replied to your email.

Brian.

21st Oct 2012 7:09pm

ellebarto

Member Since: 05 Oct 2012
Location: Manchester
Posts: 334

Re: Engine power loss and Pre 14th October 2009 faulty ECU's

ellebarto wrote:
MD5 wrote:
I'm looking for your help in finding what's wrong in my defender 110 Td4 MY09

While you drive on road or offroad the engine suddently start to loose power and change noise and after few second the engine turn off by itself.

If you immediately try to restart, the engine will refuse to start. I always need to wait 2 minutes and then the engine start and run without problem. Sometime you can drive without problem for many km's and sometime after few minutes the problem are back again.

I was pretty sure that the MAF sensor (the one near the vacuum pump) was is some way faulty but today, after MAF replacement the problem are back again.

I see that my ECU was built in June 2008. I read that Pre 14th October 2009 ECU's could be defective.
Do you think a problem like mine could be related to a faulty ECU's ?

Thanking in advance for any help attempt!

No help to you mate at all but I'm having exactly the same problem. Having had it on diagnostics there are no obvious fault codes but if you look very deep into the code it reports loss of contact to the ECU. Thats where I come unstuck because I cant find any reference to that anywhere so I'm not sure what the fix would be!

OK, well this issue has progressed a bit and I wondered if anyone had any further input.

Basically, I’ve had two big laning days in the car and the fault has not re-occurred. Keeping in mind it did happen like clockwork in the circumstances I originally described. So I looked at the changes I have made.

Firstly I had a side exiting exhaust put on but that was virtually the whole original exhaust re-engineered. There was just one very short piece of straight pipe added.

Secondly, I hadn’t fitted my silicone turbo hose very well and it blew off on the motorway on the way home one day and I drove it for about 5 miles like that before I stopped and sorted it. There was a hell of a lot of greasy oil blown out around the pipe.

Do either of these changes sound like something that could have affected this fault?

19th Nov 2012 10:39am

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