Hi, so glad I found your post. I am starting to lose faith in landrovers, having previously owned a dreaded 1.8 petrol with the dreaded head gasket issue. I now have a td4 as I read these where much better. I've owned it 8 months and now I have this lack of power issue when driving on the motorway at 50+. It just won't shift passed 70mph and starts to lose power with high revs, then all of a sudden at the top of the Hill starts to zoom off. Exactly as described in your thread. A few weeks ago the engine management light came on and my mechanic said after a diagnostic test that it is a faulty turbo and it needs replacing. He has cleaned the turbo out and the light went away although the loss of power remained and 4 days later the light has reared its ugly head. He said if cleaning it didn't work I would need a new turbo and think he muttered !! But I've read on other threads that peops have had new turbos fitted and the problem remains. Just wandered if mine could be this problem. So what shall I ask my mechanic to do? Please bear in mind I am a woman and only ever put fuel in it and drive, oh and go through the car wash, so I will jot be opening the Bonnet and pulling out tubes etc lol. I have just had a full service and the turbo cleaned. Also a few months ago (please don't remind me how very stupid I am) I put petrol in my diesel tank and didn't realise until I had broken down 30 miles down the motorway and had the aa come out to drain it. Could this have caused these symptoms with the fuel pump? Any advice greatly appreciated
hi where did you buy your solenoid from if you do not mind me askingHello all, just thought i'd update you on the cause of my lack of power issues with my Td4 03MY in case it helps anyone.
I initially had a split turbo hose whilst on the M6. It was the short 90 deg hose. Symptoms were initially lack of power, and then black smoke and air whistling sounds. Bought a new one of those for under a tenner and fitted it.
Unfortunately it didn't fix the lack of power over 70mph, but at least there was now no smoke. Symptoms now were that on a slight gradient on the motorway the car would start to lose power and thus speed. There was also a slight noise but not the same as the air noise from the split before.
The Td4 turbo is variable geometry and is controlled by the boost solenoid (see black plastic unit in the picture). It applies a vacuum to the turbo via pipe 1 in the photo. When the vacuum is applied the turbo exhaust side vanes close and it uses more exhaust gas to provide more boost.
My solenoid had failed so that it constantly applied vacuum to the turbo, and thus operated it at max boost all of the time. What then happens is that when you get a high speed / load condition i.e. 70mph and a hill, the ecu senses that the turbo is over boosting and derates the engine by cutting the fuel in order to protect it from damage. It will then speed up again when you get back onto the flat.
The solenoid is STC4198, cost £34, took 15mins to fit (don't need undertray off). Fitted and all working perfectly now.
So if you have lack of power on hills at 70mph, try this test. Pull pipe 1 off the turbo and drive a 70mph hill and see if it cures your issue. If it does, voila it's the boost solenoid. With the pipe off it will be a little sluggish at low speed accels as it won't be able to close the vanes for full boost, but it's fine to drive in order to do your 70mph test.
For info pipe 1 is solenoid vacuum to turbo, pipe 2 is vac supply to solenoid from the plastic reservoir at the side of the engine, pipe 3 is the solenoid vent to fresh air via the little filter. Check these for holes as they rub various engine parts. Also worth checking that your boost solenoid filter isn't blocked, as this would prevent the solenoid from releasing the vacuum and cause the same symptom. Fair chance it's ok though and your solenoid is bust.
Good luck !
New one for you guys.... EML comes on going up hills at 60/70mph and then goes out and power comes back once the hill has levelled out....classic symptoms but...
I've changed:
- Boost solenoid (Official LandRover new part) - also tried without solenoid connected, same problem.
- Fuel filter - allmakes part - seemed to improve things a bit but maybe my imagination.
and no difference...I'm trying to avoid the £600 New Turbo so am looking for other ideas: fuel rail sensor and wiring....but this would be more all the time/intermittent EML rather than set conditions....Fuel pump...possible but no problem starting etc. and I can hear it fire up and turn off after a few minutes.
Any other ideas, please ??? 2004 TD4 HSE Auto, 70k on the clock.
P.S. From speaking to Turbo specialists, Garrett don't do a recon-kit for the variable geometry in these Turbos and apparently those companies offering this are using old/2nd hand parts so it's another fix or new Turbo
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