Vehicle & Technical > Discovery

Engine Vibration In 300tdi disco

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felix:
Was there ever an answer to this? I have a very similar problem. No it doesn't go away under power. Its not to evident coasting or at idle.

How do you detect a misfire or any of the other problems mentioned?

Felix

Range Rover Blues:
Yes I'd be interested to know.

Anyway Felix, IIUC you have the vibration, not at idle but mid-power range and when under load, not when coasting.

Does it not do it when you rev the engine up in neutral?

It sounds like a power related vibration so all the above could be relavent.

Compression test requires a special tester, a petrol car tester won't work.

A misfire could be due to a dodgy injector, these can be tested on a special rig, or a faulty pump, again a specialist job.  One very messy way of testing it yourself is to loosen the pipe union to each cylinder in turn and observe the resulting drop in power.

But I just have to point out that a vibration under power could also be transmission related, like a UJ on it's way out (let's hope so)

drmike:
I'd second the comment about a UJ - I had one go and it felt just like a misfire under power.

Mike

felix:
I do hope its that but with the list of other things going wrong who knows.

The rear sunroof has started to leak and in a big way today!

I assume prop shaft UJ rather than axle CVs at the front?

I did recently replace the front disks could it be related to the stub axle shims - I kinda didn't bother checking these as it was freezing out and just replaced the ones the came off.

Felix

drmike:
Well I can offer a ray of sunshine.

My front prop UJ was going and coasting no vibration, blip the engine no vibes but up a hill with a bit of go go and it vibtrated away like mad.

I'd make a date with your prop and see if there's any play. Having just replaced both UJ I can say it's not hard but it can be an awkward job to do as those needles seem to be keen to make a break for freedom!

FWIW I too would just put the same shims back that came off.

I can't see that they disc would be out of balance could you?

Mike

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