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White Smoke and Restricted Performance
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Kalaya74
 


Member Since: 26 Feb 2023
Location: Cape Town
Posts: 3

South Africa 2012 Discovery 4 3.0 SDV6 SE Auto Zambezi SilverDiscovery 4
White Smoke and Restricted Performance

Hey guys
Hoping to get some good avenues to keep testing the problems that we are having with a Disco 4 SDV6.
A while back I was getting a P006 error on diagnostics and replaced the MAP sensor.
Then not long after that I got the dreaded Restricted Performance error. This was quickly diagnosed to be a cracked passenger side inlet manifold which I got replaced. Then pretty soon after that I started getting white smoke (unburnt diesel) on startup and mostly when it was cold and the idle was super rough. When the engine warmed up and was going nicely she was pulling really well but then occasionally would kick back into Restricted Performance again with the same error code. This we suspected was faulty injectors, and as it has got a lot of miles on the clock I replaced all 6 injectors and at the same time did the passenger inlet manifold as I know they are prone to cracking and have had a bunch of recalls.
However the same problem is still there - white smoke, super rough idle and then when Restricted Performance kicks in she is unbelievably smooth - clear the error and back to rough and stumbling idling even.

The vehicle is currently with specialists who have since:
- Sent both turbos to be tested - no problems
- Checked all the vacuum lines - no problem
- Tested with replacement MAS sensors - no problem there
But the problem persists and I wondered if this forum might have any suggestions on avenues to look down.
Thanks in advance!
  
Post #232804126th Feb 2023 11:54 am
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goldypurple
 


Member Since: 23 Mar 2018
Location: Norfolk uk
Posts: 92

England 2010 Discovery 4 3.0 TDV6 GS Auto Stornoway GreyDiscovery 4

Crossover pipe and EGR pipes
  
Post #232815427th Feb 2023 10:18 am
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Kalaya74
 


Member Since: 26 Feb 2023
Location: Cape Town
Posts: 3

South Africa 2012 Discovery 4 3.0 SDV6 SE Auto Zambezi SilverDiscovery 4

Thanks @goldypurple
I'll look at those as well - do you think that applies with the problem happening only when it is NOT in Restricted Performance?
  
Post #232816527th Feb 2023 11:48 am
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