 | Home > Technical > Puma power loss - unusual squeal from turbo |
 
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018   
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Does the second post here help?
http://www.defender2.net/forum/topic34449.html?highlight=actuator |
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26th Dec 2015 4:32pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1780  
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Didn't have the squeal but all the rest.
Intermittent at first (after fast / long trips) but gradually more and more. New turbo fixed the fault. |
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26th Dec 2015 4:44pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372 
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First check the pipe from the turbo to the intercooler for splits, since this is a common problem and will cause exactly the symptoms you describe. On the 2.4 check in particular that the steering shaft where it enters the steering box isn't touching the underside of the air pipe. You probably won't be able to see this, you might be able to feel it, but unless you are 100% sure whip the pipe off to check. As I say it is a common problem.
It is unlikely that an actuator fault will cause a squealing noise, but with the engine stopped the actuator lever should park in mid position. If it is fully up it is likely that you have a chafing problem in the harness from the ECU to the actuator. You will also have virtually no power at all! |
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26th Dec 2015 6:07pm |
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| v8bobber Member Since: 26 Aug 2012 Location: pembrokeshire Posts: 445 
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Thanks for that, will have a look tomorrow if I get chance.
I wouldn't have thought that a hole in the pipe would be causing this as the power was restored with a turn off / restart Since I posted this I have plugged in the nanocom and got the following fault codes.... P0234 Turbo overboost condition (Intermittent) P1103 Mass air flow sensor in range but higher than expected (intermittent) P0404 EGR control circuit / performance (Not tested DTC, permanent) P0100 Mass or volume air flow circuit (Not tested DTC) Not sure if this means anything to anyone Dave |
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26th Dec 2015 8:44pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372
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What may well have happened was that a persisted fault condition (turbo overboost) was detected causing the ECU to put the engine in limp mode. Cycling the ignition would clear this and restore power - until the next time. It is exactly what happened when my intercooler pipe split!
Also consistent with your DTCs. The good news if it is the pipe is that although a pipe isn't cheap it is cheaper than a turbo! |
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26th Dec 2015 9:20pm |
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| v8bobber Member Since: 26 Aug 2012 Location: pembrokeshire Posts: 445
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Right you are. I'll put it on my list of things to check.
Wouldn't explain the noise when the engine is turned off though but certainly worth a look Thanks again Dave |
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26th Dec 2015 9:52pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1780
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When mine did it, I got out without switching off and got SWMBO to rev the engine whilst I watched the actuator for movement - it didn't move.
She switched it off, waited a couple of seconds, started again and it worked 100%. On this last trip back through France, we got to the point where it would fail, clutch in, ignition off, ignition on, clutch out & off we go again for between 1 & 120 miles, I had IIRC similar fault codes to you, the biggest thing was a faulty EGR valve, stuck mechanically partially open so had black smoke issues under load (even with a shut egr map) & I think this choked the vv mechanism. I even put a couple of expensive cleaners through to no avail. Before I found the above, I think I had changed every sensor, loom repair & hose going! Good luck |
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26th Dec 2015 11:02pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Doesn't the OP have a Td5 not a 2.4 - others have said this has a vacuum operated actuator not electrical. |
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27th Dec 2015 10:58am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372
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Well, the thread is titled "Puma power loss" and the OP refers to his "2008 Puma"!
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27th Dec 2015 12:49pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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My confusion - I looked as his icon, which is for another vehicle...
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27th Dec 2015 6:05pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372
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Totally understandable, and I did exactly the same initially!
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27th Dec 2015 7:26pm |
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| v8bobber Member Since: 26 Aug 2012 Location: pembrokeshire Posts: 445
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My apologies, now remedied.
When I set up the profile many moons ago I can't even remember putting the vehicle specifics in. Handy to know. ..... Going on from what has been said then, is a new turbo the only true fix? I don't think the vehicle has travelled at such a speed for such a long distance and the powerloss occured after a particularly hard press of the throttle past a vehicle on the dual carriageway. I'm wondering (and secretly hoping) that the actuator was at the end of its travel and as it was not used to being there simply became stuck. If I had the nanocom plugged in as I was travelling when this problem occured, would this show up somewhere as an unusual value? Dave |
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27th Dec 2015 9:31pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372
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1. Check with engine stopped to see if the turbo actuator appears to be mid position or at either limit of travel.
2. If mid, check the turbo to intercooler hose as advised above. 3. If actuator is at end of travel or if hose is perfect, disconnect actuator operating arm from linkage and check how free the linkage is to operate (the bit on the turbo, not the bit on the electronic actuator). It should be very free to move and "feel as though it is broken". When you've done these things tell us what you find and we can advise what to do next. It is possible to replace the actuator servo on its own if it is faulty, but they are pretty robust. LR will only sell you a complete turbo though. |
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27th Dec 2015 10:20pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5697 
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I have a working actuator here if you need. I would also suggest that you check your turbo to manifold gasket, or do a search on the forum for info about this.
Andy |
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27th Dec 2015 10:37pm |
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