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HACKRCHILD
Member Since: 30 Jan 2024
Location: The garage 🥴
Posts: 20
  
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Hi everyone,
I seem to have some slight vibration at idle. Almost feels slightly bouncy in the car for a brief moment and then goes. It’s not consistent and it intermittent. It’s only gentle but noticeable.
Engine RPM does not fluctuate at all and sits rock solid at about 6-700rpm. I have tried cleaning the MAF and throttle body and chucked a new air filter in as the old one was a bit worse for wear and it seems to persist. (Although debatably feels better but could be placebo, still present regardless)
I can make this bounce/judder transmit through the car a lot more if I let the car creep with the brake (and I mean barely moving, idle RPM). The every so often judder appears to be present regardless of being in park, drive or neutral etc.
Car drives buttery smooth with no issues or judders at all it’s just at idle. Is there anything obvious to check before getting it plugged in? I was thinking about taking off and cleaning the EGR as it looks pretty rough from the outside.
To be very clear, engine sounds good and drives great with no engine rpm fluctuations and this vibration is not a crazy strong one. I’m leaning on potentially shot engine/transmission mounts due to the judder being more present when engine is loaded with gearbox against the breaks going slow.
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 10th Feb 2024 1:21 pm |
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kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6576
 
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A very vague guess - check if the rubber around the rear prop shaft center bearing is ok.
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| 10th Feb 2024 1:42 pm |
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HACKRCHILD
Member Since: 30 Jan 2024
Location: The garage 🥴
Posts: 20
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Thanks I’ll look at this. Would this cause it in park and natural also?
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| 10th Feb 2024 5:07 pm |
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desv8
Member Since: 01 May 2020
Location: CHELTENHAM
Posts: 124
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Had this once when the car had been stood for a while and only on initial start up. I put it down to a plug or coil having a funny five minutes.
When were the plugs last changed.
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| 10th Feb 2024 10:00 pm |
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KPTV8
Member Since: 05 Feb 2012
Location: Itinerant
Posts: 137
  
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Aye, two of my old 4.4 V8s would occasionally do this - was annoying 'cos the engine is capable of idling SO smoothly. Very occasionally the "roughness" would persist at higher revs (maybe 1500) for while as well as appearing at idle speed - but always settled down after a few minutes regardless of revs.
I never got to bottom of it, but my gut feel is same as Desv8 above - plugs, or the electronics driving the plugs.
Cheers  ))
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| 10th Feb 2024 10:36 pm |
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Bungle
Member Since: 07 Apr 2015
Location: Wanborough
Posts: 254
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HACKRCHILD wrote:Thanks I’ll look at this. Would this cause it in park and natural also?
No. Generally only noticable at higher speeds so I don't think this will be your issue. Mine does this from time to time as well at idle, on the basis it has now done 100k miles with me and has always been like it I just ignore it!
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| 12th Feb 2024 10:16 am |
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pjm-84
Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2442
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kajtzu wrote:A very vague guess - check if the rubber around the rear prop shaft center bearing is ok.
Mine was well gone but the V8 was so smooth I didn't notice until I changed the fuel strap .
plugs / coil packs / swap out the PCV / check the viscous fan / clean the throttle body
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| 12th Feb 2024 12:34 pm |
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HACKRCHILD
Member Since: 30 Jan 2024
Location: The garage 🥴
Posts: 20
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Thanks for the responses all. I have 0 vibration or judder when driving. Infact I can only feel it at idle rpm, it’s also not present at any rpm above idle when sat still.
Have cleaned throttle body and egr and added a new air filter. Replacing all the gaskets this weekend incase some unmetered air is getting through somehow.
Spark plugs are a good shout also.
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| 16th Feb 2024 5:43 pm |
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HACKRCHILD
Member Since: 30 Jan 2024
Location: The garage 🥴
Posts: 20
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Hi everyone,
Wanted to update this thread incase someone is having trouble. I did the regular cleaning of the throttle body and EGR and did all new gaskets etc. New air filter also. I’d say idle improved but didn’t iron out the lump I wanted to get.
The car had been run on mainly lpg for a couple of years, so I ran some industrial strength injector cleaner (BG44K, I was advised by someone that used to work at LR that they used this sometimes and was good stuff) and also reset the engine adaptations incase it had picked up a dodgy adaptation from being on LPG (and because I cleaned the throttle body moving the flap about etc which I think it resets too?).
And voila issue is gone! Buttery smooth idle.
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| 25th Feb 2024 7:18 pm |
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pjm-84
Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2442
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| 25th Feb 2024 9:32 pm |
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1powerrack
Member Since: 09 Nov 2014
Location: Greater Manchester
Posts: 149
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I had this issue on my V8, mine has been on LPG for almost 3 years with most of the miles (10K) done on LPG, so I too put in BG44K in a full tank of good petrol and ran it on petrol for 1/2 a tank, problem went away and never came back. D3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
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| 26th Feb 2024 1:52 pm |
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