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SUVs Land Rover Land Rover Discovery and Discovery II
4851 messages, Last post on Dec 02, 2009 at 5:01 PM
You are in the Land Rover Forum. Your Hosts are steve_ & tidester
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Hi I am an owner of LR Discovery II (2002) TD5 manual gear box and I have serious problem. Unfortunately in my country the technicians from the authorized service are incompetent or let say incapable to help me. So the problem is following: When I change gears for ex. from second to third when I push the clutch pedal in the beginning the revolutions of the engine start rising with about 500/1000 and then star going down. I have been told by the mechanics of the service to change some kind of module which controls the distribution of the revolutions of the engine during the change of gears. I did it but the result was nothing. I would like to mention that I bought my car with a damaged roof and I believe that this car has crashed and has stayed upside down. In the beginning I had to remove the air from the clutch hydraulic system because the pedal was not working. Now it is OK but I have this problem with the revolutions. The computer is not marking any mistake and that is why nobody knows what really the problem is. I would be very grateful if somebody can give some advices or to give me direction where this problem could come from. Thank you in advance.
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Replying to: taskov (Jul 30, 2008 5:26 am) But first:'do you have the same problem going from 4 to 3rd? (DOWN SHIFTING) Does your engine react smoothly without delay if you are slowly pumping the accelerator? If the answers are NO, the potentiometer is OK You have changed the EDC I understand and therefore the fault most likely is in the potentiometer itself or in the hardware between the accelerator pedal and the potmeter Your clutch is probably not the culprit. |
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Replying to: calhutch (May 29, 2007 4:18 pm) Thanks again! This saved me lot's of time and $'s. |
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abutoma thanks a lot for the prompt response. If I make "down shifting" the problem is more or less the same. When I smoothly change gears the problem is the same but not so significant. The revolutions are rising with about 100/200. If I am doing this faster and if I push the acceleration pedal hard the rev. are rising with 500/1000. It seems the problem is stronger if I change gears in high revolutions. What realy is this potentiometer, is it removable part or it is a software. And If I had a hardware problem, would not this be marked by the computer of the car? Thanks in advance.
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Replying to: taskov (Jul 30, 2008 10:15 pm) A potentiometer is a physical device used to modify the resistance in an electrical circuit. If you've ever used lights that can vary in intensity by turning a knob then you were using a potentiometer. tidester, host SUVs and Smart Shopper |
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Replying to: taskov (Jul 30, 2008 10:15 pm) Well, it seems to me that the problem lies in the pot-meter.but it may also be in the electro-pneumatic modulator. The EDC has several input sensors: 1.Vehicle speed sensor i2. Injector sensor 3 coolant temperature sensor 4 boost pressure sensor 5 Electro-pneumatic modulator 6 airflow sensor 7 engine speed sensor 8 throttle potentiometer which may be the culprit A potentiometer is a variable resistance and normally it operates in the same way as an old fashioned volume control on a radio (rotating movements) This potentiometer is sitting next to the EDC and looks like a small electro-motor attached with two screws. If this is hanging the engine will react during gearshift as if you are keeping the accelerator pedal down. But then you will also have this effect even when not driving. If the shift is in free and you press the AP (accelerator pedal) and release it quickly the rev of your engine will go slowly down. If, however, the revs are following the AP it is not the pot-meter. If the pot-meter is not the culprit I would try to check #7 and then #5 If you send me your email address I can scan in where the different parts are located. I have to tell you that I am NOT a mechanic only one who has lived with the Tdi for a long time. Good luck! |
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To abutoma. Thanks alot for the detailed info you gave me. My e-mail address is nikola.taskov  abv.bg I have tryed to simulate this situation when the car is not moving and the gear lever is in neutral. Then the problem does not exist. I rise the rev. to about 4000 then I push the clutch pedal but everything is normal. The revolutions are rising and goind down normaly. Strange problem isn't it  )) However I would be very grateful to you if you could send me scheme or the location of all this sensors. Also you got the feeling I have changed the EDC but it seems to me I have changed only one of the sensors. It was a cubic part with some kind of smal red piston. I think it could be "Electro-pneumatic modulator" Sorry for the ignoranse but what does EDC means? Thanks a lot in advance. |
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| Anyone know the firing order for this car or a place that sells a repair manual for it??? | |
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