Lacie Posted May 17, 2016 Share Posted May 17, 2016 Hi guys! First time poster here! I'm at my wits end with my usually very reliable 1999 discovery TD5. Here's the problem..... Every time I drive it, two lights flash up on the dashboard and the car loses power but only for a few seconds. As soon as I take my foot off the excelerator and then reapply foot, the lights disappear and the car is back to normal. I will try and upload the two lights that come on! There is no pattern to when it happens. It will do it when it's cold or hot, in any gear and going at any speed. It even happens when sat idle at traffic lights! It's very concerning as I can be driving along merrily and for no reason at all the two lights come on and at exactly the same time there is a "clunk" noise heard in the engine, the car loses power as I've said only for a second or two but as soon as you change gear or put your foot back on the excelerator everything clears and car runs fine again. It has been to a Land Rover specialist who is struggling to find the problem source. Apparently the diagnostic machine is not picking up the fault as the fault is not staying on long enough to be registered. So far we have done the following to try and fix it but to no avail! 1. Serviced! Oil change, all new filters. 2. New air flow meter. 3. New wiring loom (can't remember what that's connected to though!) 4. Fuel pump pressure checked and ok. Has anyone else had this problem? It seems to be getting worse as in it happens now at least four or five times every time I drive it. Any help would be appreciated! Quote Link to comment Share on other sites More sharing options...
BogMonster Posted May 17, 2016 Share Posted May 17, 2016 The one on the left is the water in fuel sensor. The one on the right is the check engine light which can indicate lots of things but if it comes on while driving, it should log a fault code somewhere. Disconnect the plug from the bottom of the fuel filter (in rear wheelarch) and see what happens. The sensors are notoriously unreliable anyway and the light is far more likely to indicate a dud sensor than water in the fuel... having said that I assume the fuel system has been checked and definitely doesn't have water in it, as a gob of water will definitely make the engine have a grump. You can run the vehicle without the sensor connected so I'd pull the plug and run it around for a few days and see what happens. I can't recall if the engine management does anything when the sensor triggers or not, I didn't think it did, but I'm not absolutely sure. The other thing that can cause random faults and often doesn't trip a fault code is some sort of internal ECU fault. They do go wrong, and they aren't very good at diagnosing their own internal faults. Your specialist should be fitting a temporary ECU to the vehicle and running it around with that for a bit as part of the diagnostic process. It is a 10 minute job to change it. I expect the wiring harness they changed was the injector harness inside the head; that and the AFM are common failures and worth ruling out. Quote Link to comment Share on other sites More sharing options...
bear Posted May 18, 2016 Share Posted May 18, 2016 Hi Lacie, If you put your location in your profile there may be someone near you with diagnostics to read the fault codes. Griff Quote Link to comment Share on other sites More sharing options...
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