Discovery TD5 engine starts shaking occasionally when started

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helmuth van es

Member
Posts
30
Good afternoon

Recently my Discovery series 2 TD5 automatic from July 2000, started to develop a problem that our garage here in France (Tarn) has thus far not been able to diagnose. His diagnosing equipment, he tried three different ones, do not see all of the car's systems. When starting occasionally, i.e. not always, the engine starts to vibrate intensely and the gas pedal does not appear to respond when pressed. When it does not vibrate, the car responds normally to pressing the gas pedal and one can drive with it. Never had this problem before, and it started all of a sudden a few weeks after it had been sitting outside in winter under a cover. Would anybody have an idea what could be the matter and what part is worth trying to replace ? I have a short video of the engine doing the weird vibrating, is it a timing issue, fuel injection issue ? But landyzone does not allow me to upload it, probably size of file I imagine.

Many thanks as always for any suggestions.
 
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Hi, that's not something to be diagnosed without watching live data while it happens or it can become very expensive to replace parts based on guesses .... though next time when it happens unplug the throttle pedal's connector and if it goes back to normal idle then replace it, i've never unplugged one with engine running so i dont know exactly if it will idle or stop completely, if it stops this test is irrelevant, also check the ECU red plug, if it's oil replace the injector loom... for any other issue a capable diagnostic tool is needed handled by somebody who knows Td5s... i doubt that a timing issue would be intermittent, ... can't help you more sorry
 
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Hi, I am in the Tarn, (Mazamet) where are you?
I too have a 2000 TD5 disco auto and have my Foxwell (diagnostic) with me which may be of some use. Not as good as a Nanocom but a lot better than nothing! and I speak French.
I just hope you aren't too far away. I also know a guy who may be able to help in Labastide-Rouairoux. He is Dutch and your name implies this!
Message me if I can be of any help.
Stan.
 
Can't help with the vibration but low battery volts can cause no throttle response, ask me how I know :)
Also as you say it's been under cover for a while did the battery go flat?
 
Thanks All, battery is new, replaced 2 months ago or so. Stanley thanks I remember now. But not Rob, I went to Onno then. Now with my regular garage between Cordes and Albi who is very capable. I contacted Famous Four as well where I used to get my parts before Brexhit and they confirmed Sierrafery's advice that a good place to start and a very common problem is the injector loom, then the fuel filter and thirdly possibly the cable of the throttle. Since the loom has never been replaced in 24 years, I plan to start with this. I also saw that Paddock in a YouTube video confirmed it is a very common problem with the TD5 engine and they sell a lot of them and even show how to do it yourself (not going to this time). I will keep you posted. Spouse wants me to get rid of it for years now and if this can not be fixed it needs to go. Well maintained always, used well, and owned for 24 years since I bought it :).
 
helmuth van es said:
Thanks All, battery is new, replaced 2 months ago or so. Stanley thanks I remember now. But not Rob, I went to Onno then. Now with my regular garage between Cordes and Albi who is very capable. I contacted Famous Four as well where I used to get my parts before Brexhit and they confirmed Sierrafery's advice that a good place to start and a very common problem is the injector loom, then the fuel filter and thirdly possibly the cable of the throttle. Since the loom has never been replaced in 24 years, I plan to start with this. I also saw that Paddock in a YouTube video confirmed it is a very common problem with the TD5 engine and they sell a lot of them and even show how to do it yourself (not going to this time). I will keep you posted. Spouse wants me to get rid of it for years now and if this can not be fixed it needs to go. Well maintained always, used well, and owned for 24 years since I bought it :).
Click to expand...
Rob is the (Dutch) Landy breaker in Labastide-Rouairoux. You contacted him about a new front valance and he quoted you €500.
We still don't know how you sorted that problem out in the end! Unless you used "Onno" whoever they are! Cordes and Albi are further away than we visit regularly.
If the injector loom IS the problem then, just to get you going at least for a short while, you could remove the plugs from the ECU and clean them, the orange one will have oil in it. There may also be oil actually inside the ECU. Not impossible to open it up and carefully clean it out, even if all you do is drain it and wipe it.
I replaced my loom ages ago, it continues to leak oil into the orange plug, I just clean it out from time to time.
But none of the above accounts for the intermittent nature of the problem.
Have you changed any of the sensors since you got the car? MAP/IAT for instance? My car started misbehaving and was transformed by changing that.
Anyway, best of luck.
 
Ok thanks, the sensors as far as I know have not been replaced. but good point. I will get the ECU plug checked first if with oil get the loom replaced as well as check the throttle connection as suggested.
 
helmuth van es said:
Ok thanks, the sensors as far as I know have not been replaced. but good point. I will get the ECU plug checked first if with oil get the loom replaced as well as check the throttle connection as suggested.
Click to expand...
Could be worth at least taking the MAP/Iat out and cleaning it with SENSOR cleaner or iso-propanol. Don't be tempted to stick anything down the little hole!
As for the MAF, just disconnect it, it'll run on a map the ECU already has installed which is just as good as with a good MAF.
(You have not told us whether you have blanked off or removed the EGR.) ;)
 
Stanleysteamer said:
Could be worth at least taking the MAP/Iat out and cleaning it with SENSOR cleaner or iso-propanol. Don't be tempted to stick anything down the little hole!
As for the MAF, just disconnect it, it'll run on a map the ECU already has installed which is just as good as with a good MAF.
(You have not told us whether you have blanked off or removed the EGR.) ;)
Click to expand...
Sorry but do not follow, I am biochemist not na mechanic :) :) !
 
helmuth van es said:
Sorry but do not follow, I am biochemist not na mechanic :) :) !
Click to expand...
OK!
Manifold Absolute Pressure / Intake Air Temperature. These two sensors which are vital for the ECU to work out how much fuel to spray via the injectors, are combined into one item that sits in the top of the inlet manifold. There is an electrical plug attached which you have to undo and then two screws/bolts hold it in place. This is what it looks like from the top
1721308195147.png
and this when out.
1721308278212.png
.

The bit that sticks up measures the temp the thingy down in the hole ( a diaphrwgm I think) which is sensitive to being poked! measures the pressure. If you don't feel up to doing this then why not get the garage to do it while they have it in!

Are they doing the work with the injector loom and the ECU as well?
 
The maf sensor is quite a big cylinrical shaped item in the wide tube heading towards the turbo just after the air filter box. You just need to disconnect the electrical plug to it.
 
Stanleysteamer said:
OK!
Manifold Absolute Pressure / Intake Air Temperature. These two sensors which are vital for the ECU to work out how much fuel to spray via the injectors, are combined into one item that sits in the top of the inlet manifold. There is an electrical plug attached which you have to undo and then two screws/bolts hold it in place. This is what it looks like from the top
View attachment 321770 and this when out.View attachment 321771.

The bit that sticks up measures the temp the thingy down in the hole ( a diaphrwgm I think) which is sensitive to being poked! measures the pressure. If you don't feel up to doing this then why not get the garage to do it while they have it in!

Are they doing the work with the injector loom and the ECU as well?
Click to expand...
Thanks ! We just agreed he is going to check the ECU red plug, replace the injection loop and gasket and I will discuss the above with him although it seems I can do this myself too if needed. Last year I have replaced the ABS Modulator Shuttle Valve myself, very proud ! and it worked too :)
 
helmuth van es said:
It is this one correct: https://www.rld-autos.com/fr/capteur/183811-senseur-discovery-2-et-freelander-1-mhk100820.html
Click to expand...
If you are talking about the MAP/Iat sensor, NO!
What you want is one of these, or similar

I have used Atuo-doc before and they are OK.

I know @sierrafery says it is not likely to be this, and he is usually right.
BUT if the symptoms do not happen until, the car gets hot and if it is unwilling to rev, then it could well be this as this is what I had.
BUT we go back to his original point, which is that you need to be able to do live data reading with a diagnostic and this is exactly how I found out that this was what I needed, with @Sierra's help of course! Then maybe we will be abl;e to zero in on the problem.
 
Well it took a while because of vacations here in France but he replaced the injection loop, gasket and no oil in the ECU red plug visible and a filter. Still the same problem. He now suspects it may be an injector, is that at all possible ? FYI he can communicate with the car through his diagnostic devices, three different ones but not with the engine... Any thoughts ? thanks !
helmuth van es said:
Thanks ! We just agreed he is going to check the ECU red plug, replace the injection loop and gasket and I will discuss the above with him although it seems I can do this myself too if needed. Last year I have replaced the ABS Modulator Shuttle Valve myself, very proud ! and it worked too :)
Click to expand...
 
Stanleysteamer said:
OK!
Manifold Absolute Pressure / Intake Air Temperature. These two sensors which are vital for the ECU to work out how much fuel to spray via the injectors, are combined into one item that sits in the top of the inlet manifold. There is an electrical plug attached which you have to undo and then two screws/bolts hold it in place. This is what it looks like from the top
View attachment 321770 and this when out.View attachment 321771.

The bit that sticks up measures the temp the thingy down in the hole ( a diaphrwgm I think) which is sensitive to being poked! measures the pressure. If you don't feel up to doing this then why not get the garage to do it while they have it in!

Are they doing the work with the injector loom and the ECU as well?
Click to expand...
Well it took a while because of vacations here in France but he replaced the injection loop, gasket and no oil in the ECU red plug visible and a filter. Still the same problem. He now suspects it may be an injector, is that at all possible ? FYI he can communicate with the car through his diagnostic devices, three different ones but not with the engine... Any thoughts ? thanks !
 
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