 | Home > Puma (Tdci) > Intermittent power loss |
 
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| Eduardo Member Since: 28 Aug 2008 Location: Región Metropolitana Posts: 2110   
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andrewfaber
Probably it is the engine safety management system that cuts the power when the coolant temperature goes over ~120�C... This issue happens specially in hot days when the car is under pressure (i.e. climbs in 5t or 6th gear at high speed) Some of us have this problem for a looooooong time. The heating is quite fast and most of the times are not reflected in the temp dial in the car, but can be checked with any ODBII reader. In my case I change the intercooler and the thermostat for other that opens at low temperature and use the spacer nut for the fan provided by Nakatenga. During last summer all going well but still not sure if the problem is solved. A lot of information is available in the site regarding possible causes and solutions. I'm tend to think in a degradation of the radiator but its a major cost that I dont like to assume yet. Cheers! Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo"  Click image to enlarge |
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15th Jun 2016 12:59am |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
Thanks, that makes sense and it is a possibility. I have been advised to clean the MAF sensor ando check the turbo hoses as they may be collapsing under load.
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15th Jun 2016 7:36am |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
The power loss is very intermittent, and very short, it lasts about 1 second and then power returns, this will occur several times going up a hill.
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15th Jun 2016 7:39am |
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| Eduardo Member Since: 28 Aug 2008 Location: Región Metropolitana Posts: 2110
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MAF is another possibility (also I had that
 ), but in general the power loss failure happens randomly independant of the driving conditions.
On the other hand the safety management last more than 1-2 seconds, probably last 5-20 seconds (time neccesary to drop the temperature to an acceptable limit and have a response again). Before change the ECU it's better to check first the wire loom that going to the ECU to see if some cable is damage and try to get some live data of the failure through an ODBII and obviously the connection of the sensors. Regards Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo" Click image to enlarge |
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16th Jun 2016 11:03pm |
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| HardCharger Member Since: 03 Mar 2013 Location: Manila Posts: 757 
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Given the history with the ECU, it could be possible that that is where you problem lies. Is your fuel filter due for a change? It can also lead to surging at high speeds due to high demand but limited supply from the filter. The problem will not really manifest at lower speeds unless your filter is really blocked. Worth a thought before you buy another ECU?
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17th Jun 2016 1:56am |
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| nickhodgson Member Since: 08 Dec 2009 Location: Zambia Posts: 174 
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When the engine is idling "test" all the electrical connections to sensors that you can see by wobbling them. See if any of them make a difference. I found the source of a similar problem on my Puma that way - the loom was pulling on the connector and I rearranged the loom and it was repaired. Also check the relays under the seat.
The fact that the loss of power happens in relation to a certain load/speed condition may point to the engine getting hot. I would get a scan gauge or similar and view live data as you are driving. Click image to enlarge by the way this image is from my V8 and I am wondering about the very high intake temperature? If anyone know if 62 degrees in traffic is possible in an ambient of 25 degrees? 1995 300tdi Defender 90 P/UP 2011 Puma Defender 130 D/C 2000 300tdi Defender 110 P/UP 2015 Discovery 4 SDV6 HSE |
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17th Jun 2016 2:01pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17724  
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It is possible that it is a defective throttle position sensor, given that on hills you may well be pressing the pedal further than you do normally.
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17th Jun 2016 3:37pm |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
I replaced the MAF sensor today with no result, still intermittently loosing power especially toward the top of a hill. I also opened up the wiring loom that runs over the AC unit to the turbo and MAF, all the wires are in good condition and the loom is not pulling on any of the connections. I have recently changed the fuel filter (after it starting doing this) with no effect. All other filters were changed at the same time. I am starting to think it may be the VCV, however I have also seen another forum where the fuel filter housing needed to replaced as not enough fuel was getting through when under load resulting it fuel starvation.
It could be the throttle position sensor however I have tried driving up a hill keeping my foot absolutely still and towards the top of the hill it started loosing power for about 1 second and then coming back. I have an OBDII that use to watch engine parameters when driving, when this power loss happens, the fuel rail pressure drops right down and the engine load goes to 100% and then everything returns to normal and then it will happen again. I have also used it to watch the mass air flow, the air flow will drop down when the power loss occurs and then come back as the power returns. I have had my turbo hoses out and checked them for holes, they are both fine. |
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17th Jun 2016 5:40pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17724
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If you're seeing the fuel rail pressure drop, then I suspect VCV, the fuel rail PRV (less likely since when it fails it stays failed), or something causing fuel starvation (water in tank, diesel bug, crud, blocked fuel filter, etc).
The fuel system is poorly monitored on the Puma Defender, and generally it is the absence of DTCs that points to fuel. I would replace the filter, check that the fuel looks clean, and replace the VCV if changing the filter makes no difference. If the fuel is contaminated you'll almost certainly need to replace the VCV anyway, it is very susceptible to damage from contaminated fuel. |
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17th Jun 2016 6:50pm |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
I agree with you. Before it started happening I filled up in remote part of Namibia (possibly bad fuel), and everything points to a fuel problem, however changing the filter has had no effect and I have drained the filter several times to check for water and its been fine each time. My plan is to change the VCV as it only seems to happen towards the top of a hill when the load has been high for a longer period and the fuel is not being let through by the vcv fast enough, the power loss continues after the hill for a bit and then goes away
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17th Jun 2016 6:55pm |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
Changing the VCV has had no effect on the problem, and the pressure relief valve has not popped. I don't really know where to go from here. The only other fault it has thrown out is P0110-15, faulty air intake temperature sensor, but I've just changed the MAF sensor so the temperature sensor is also new. I've just been for a drive, ambient air temperature about 13 degrees C, and the air intake temperature sensor was showing 19 degrees C consistently, and when I stopped and turned off the engine is rose to about 34 degrees C. Does this seem normal? I am suspecting that the wires going to to the ECU from the air temperature sensor are faulty, and this causing the ecu to incorrectly adjust the air fuel ratio, does this make sense to anyone?
When the surging happens, the fuel rail pressure drops, the mass air flow drops and the manifold air pressure also drops and tje engine load goes to 100% then all 3 return to normal and the engine load returns to whete it was after about 1 second. Otherwise I may have to start looking at the fuel supply system. |
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21st Jun 2016 6:34pm |
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| BigRuss Member Since: 15 May 2010 Location: Norfolk Posts: 2785 
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Is it the original turbo?
I had a similar issue where it would loose power while driving, it turned it to be a failure with the turbo control module. And as they don't sell them separately I had to have a new turbo and control module fitted. Russell 2011MY 110 XS USW Black |
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21st Jun 2016 6:43pm |
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| andrewfaber Member Since: 14 Jun 2016 Location: South Africa Posts: 7 |
Hi Russel
It is the original turbo, but I don't suspect the turbo, as when the road is not too steep, it can get to 140km/hr without loosing power or hesitation. But food for thought. Andrew |
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21st Jun 2016 6:47pm |
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