vibration at 2000 to 2250rpm and above 120kph.

Land Rover Discovery 1, 2 and 3

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vibration at 2000 to 2250rpm and above 120kph.

Postby Paul » 03 Jun 2009 07:42

My TD5 has developed a vibration between the rev band 2000 to 2250 which then disappears but is also evident at 120kph. It's just had a 220,000km service and I asked them to check for the obvious (propshafts, suspension joints etc). They tell me they can't find anything wrong with the undercarriage but suspect the vibration is engine related, maybe a misfire. The injector harness has been replaced 3 months ago. Any ideas as to what may cause a misfire under these conditions??
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby naks » 03 Jun 2009 09:12

Paul wrote: but suspect the vibration is engine related, maybe a misfire. The injector harness has been replaced 3 months ago. Any ideas as to what may cause a misfire under these conditions??


Paul, I doubt it's a misfire - it would be very noticeable. My previous Defender started misfiring, and you couldn't miss it - it was similar to a vinyl skipping while playing.

The fact that your vibration occurs in a rev band points to a drivetrain issue. A simple way to diagnose this is to remove the front propshaft and then drive around (you have to lock the CDL). If the vibration disappears, then the problem lies somewhere in the front axle starting with the front diff. If it doesn't, then the problem lies somewhere with the back axle.

At least then you will have a starting point to work with.
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby Paul H » 03 Jun 2009 13:53

Hi Paul

Have a look at the engine mountings; I just went through the same thing. They are oil filled and may look okay, but if they leak it will cause vibration. I bought mine from Cross Country in Albertan at a fraction of the stealers price. lANDY TECH in Boksburg are the guys thay found my problem. Hope this helps.
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby naks » 03 Jun 2009 14:08

Also remember that because the Td5 has 5 cylinders, there will always be some residual vibration no matter what. :roll:
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby Paul » 05 Jun 2009 07:42

Hi Guys,
Update. Got the car back last night after service and they had put the computer on her. Faults recorded were:
1). No. 1,2 & 5 injectors - open circuit.
2). Cruise control stuck closed
3). Injector No 4 overfuelling

Any ideas what these mean?
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby Pumba » 08 Jun 2009 13:21

It seems you're driving only on cylinder 3, while the others are clapping hands!

This may be serious if you don't get it fixed rather quickly. You could potentially melt pistons if it runs too rich / lean, and that would'n be a cheap fix.

It sounds like a job for Landytech or Landyonline.
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Re: vibration at 2000 to 2250rpm and above 120kph.

Postby Paul » 25 Jun 2009 07:54

Hi Guys,
quick update. Changed No 4 injector for a re-con (R1800) and now the truck feels totally different, much smoother. I asked the garage about this open circuit fault on injectors 1,2 & 5 but they said it's nothing to worry about as there are no other faults recorded relating to them. I find that a bit strange as why would the ECU record an "irelevant" fault. However, had a look at the harness at the ECU and there was still some residual oil there so cleaned it off (I replaced the injector harness acouple of months ago).
There was also an "engine speed" missing fault but again they said nothing to worry about as it could be related to crankshaft sensor but no other faults recorded. I would appreciate any ideas on this one.
One other thing. At idle she occasionally clatters a bit louder, it seems to come and go and if I drop her into neutral the engine does sound a bit quieter. The same happens if I squeeze the throttle a bit. Is this normal or maybe cause she's done 220,000km, I should expect these noises??
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