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Misfire / jerkiness cause - engine or Torque convertor?
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Rob77
 


Member Since: 15 Apr 2019
Location: UK
Posts: 1

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3
Misfire / jerkiness cause - engine or Torque convertor?

The car is a 14 yr old D3 V6 auto which was remapped & egr's blanked before I bought it. All running brilliantly until about 6m ago, which coincidentally was just after a service.

There is now a distinct "misfire" which generally starts around 65mph. It seems to vary in severity from day to day but never goes away. The fuel consumption has also gone from 27/28 down to 24mpg.

There are 3 main theories that have been put to me:

-Local garage who did the service blame it on the engine and is convinced the egr removal is contributing to the problem.

-A friendly retired mechanic is convinced there's a small manifold leak (but no-one else supports this)

-Independent LR garage is fairly sure (but not 100%) that its a symptom of the torque convertor failing and needs to be replaced.

Nothing showing up on sensors it seems.

Any suggestions which route to go down first? I'm reluctant to shell out £2K for new torque convertor only to find the fault is still there..

Thanks!
  
Post #204608715th Apr 2019 1:05 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

More information needed otherwise its a guessing game which is little or no help to you.

Start with a full diagnostic check of all control modules and post the codes back on here. Preferably using GAP IID if available.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #204610315th Apr 2019 2:07 pm
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eightfoot
 


Member Since: 12 Apr 2015
Location: sunny essex
Posts: 760

United Kingdom 2005 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3
Re: Misfire / jerkiness cause - engine or Torque convertor?

Rob77 wrote:
The car is a 14 yr old D3 V6 auto which was remapped & egr's blanked before I bought it. All running brilliantly until about 6m ago, which coincidentally was just after a service.

There is now a distinct "misfire" which generally starts around 65mph. It seems to vary in severity from day to day but never goes away. The fuel consumption has also gone from 27/28 down to 24mpg.

There are 3 main theories that have been put to me:

-Local garage who did the service blame it on the engine and is convinced the egr removal is contributing to the problem.

-A friendly retired mechanic is convinced there's a small manifold leak (but no-one else supports this)

-Independent LR garage is fairly sure (but not 100%) that its a symptom of the torque convertor failing and needs to be replaced.

Nothing showing up on sensors it seems.

Any suggestions which route to go down first? I'm reluctant to shell out £2K for new torque convertor only to find the fault is still there..

Thanks!


fuel filter fitted ??was it genuine?? are the pipes fitted on the correct connections??
 please excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4 
 
Post #204616415th Apr 2019 4:56 pm
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jsamuelson
 


Member Since: 07 Feb 2011
Location: Cornwall
Posts: 214

United Kingdom 2009 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

The TC would be the last thing on my list to suspect. A dying TC or gearbox issue would manifest itself in a bunch of other ways (I think) that you would notice at various different speeds.

Sounds like a fuel/mix issue to me. I would start there, look at the fuel filter/tank, check the operation of both fuel pumps, look at the various air sensors.

But really need to get those codes read otherwise as said, it’s like stumbling around in the dark.
  
Post #204657717th Apr 2019 9:04 am
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Stevepd
 


Member Since: 06 Mar 2018
Location: Wiltshire
Posts: 390

United Kingdom 

As above, see if you can get the codes read if any. Mismatch of the injectors?

Steve.
  
Post #204660117th Apr 2019 10:11 am
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