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Home > Technical (L322) > EGR’s - Throttle Bodies - Turbo’s : And how they work.

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Kevhdkent

Member Since: 27 Oct 2021
Location: Kent
Posts: 69

Re: EGR’s - Throttle Bodies - Turbo’s : And how they wor

[quote="GraemeS"][quote="Kevhdkent"]

Caesium wrote:
Kevhdkent wrote:

The purpose of this exercise is I’m trying to understand the conditions that caused a critical drop in power while motoring at speed, reducing revs to 500rpm but without stalling the motor. Then complete non-starter, UNTIL the EGR to intake manifolds were disconnected ?

Could the EGR’s fail to open at speed ? Could this cause both lack of power at 60mph, and then refusal to start ?
Starting only occurring when clean air is allowed direct into the manifold ?

Disconnecting the EGR intakes gave exhaust gas somewhere to go which then allowed the engine to fire, indicating that the exhaust was effectively entirely blocked indicating a stuck turbo, nothing to do with EGRs.

This is actually the theory I am trying to test. However, I have not been able to find a schematic that illustrates the full air/turbo/exhaust flow. I am lead to believe that there is a 3rd route available for exhaust gases beyond recycling via the EGR or flowing thru the turbo. That being a waste gate, in which case a disfuctional turbo would not cripple the motor ?

I’ve plainly got a (massive) hole I my knowledge, but everyday’s a school day, so what am I missing ?

18th Nov 2021 9:22pm

briangunn

Member Since: 19 May 2019
Location: London
Posts: 56

2010 Range Rover Vogue SE TDV8 Buckingham Blue

There is no waste gate - the turbo is variable vane.

18th Nov 2021 9:24pm

JayGee

Member Since: 27 Jul 2021
Location: London
Posts: 3196

2012 Range Rover Vogue 4.4 V8 Orkney Grey

The waste gate is only open under boost ( overboost) so won't be a bypass route around a seized turbo. Can you pull the intake hose of the turbo inlet and see if you can spin the blades? 2012 TDV8 Vogue (L322)

18th Nov 2021 9:28pm

Mikey

Member Since: 10 Jan 2008
Location: Dundee
Posts: 1750

Re: EGR’s - Throttle Bodies - Turbo’s : And how they wor

Kevhdkent wrote:

The purpose of this exercise is I’m trying to understand the conditions that caused a critical drop in power while motoring at speed, reducing revs to 500rpm but without stalling the motor. Then complete non-starter, UNTIL the EGR to intake manifolds were disconnected ?

It's 99% a failed LH turbo

Until you remove the downpipe, or intake pipe, your not going to know

Same as I said on your other thread...

18th Nov 2021 10:16pm

Kevhdkent

Member Since: 27 Oct 2021
Location: Kent
Posts: 69

Thanks Mikey, that’s what I wanted to know.

The purpose of this thread and the reason I started a separate one is that I want to understand the reasoning and mechanics behind the issue rather than simply accepting (very welcome) advice.
I guess that’s why most people are on this part of the forum instead of just giving their car straight to a dealer.
I’m just in the early stages with a very low knowledge base !

19th Nov 2021 6:58am

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