I have a tdv8 4.4 with 125k miles on the clock. One of the many ailments these large slow reving engines appear to suffer from are carbon clogged and failing EGR valves. At £350 each, replacement is expensive. I have heard of people using emulators sourced from Australia with some success.

I pulled my induction manifold off last year to replace the oil/water cooler (another repetativev fault we have to work through) and it was really clogged with tar. I cleaned it as best I could with diesel fuel. This indicated to me that the rest of the engine was likely the same. I use archoil oil and fuel additives as a preventative measure.

Would hydrogen cleaning solve the problem of keeping the induction and egr system clean of carbon?

Has anybody used hydrogen gas to clean their engine and how successful is it?

2011 RR Vogue TDV8 4.4

I thought there was one EGR on 4.4 tdv8.

I don’t know about hydrogen induction cleaning, but there are a few H2O or water based induction cleaners out there.

Autocode has not so far been able to develop emulators for the 4.4 tdv8, only the 3.6 & 2.7 tdv8. ______________________________
Vogue tdv8 08MY poverty pack - wow

I think the TDV8 4.4 has two EGR's? Perhaps somebody can put us straight on that ........ they are not easy to see or get at.

Hydrogen cleaning ....... if it works appears to be a very cost effective alternative?

only one egr..  ... - .- -.




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Thank you Stan for clearing that up.

I was really surprised at the build up of tar in the engine induction system. I can see why the EGR fails in this engine.

Has anyone had an HHO Carbon clean carried out on their Range Rover TDV8 4.4 and what was the result?

This might not be a very productive thread?

Is HHO the same as H2O, i.e., water? Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

You can buy a spray cleaner with a long hose you feed it in slowly with the engine running. I just saw it on YouTube


wondering if this, the OP or any induction cleaner is any good? Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

I'd have thought that any "liquid moly" type product is going to feed a load of accumulated horribleness into your engine, which can't do it any good? Surely removing the intake and manually cleaning it out - I'm thinking the family dishwasher when the wife's not looking - (joke) would be better?
Hasn't Nino done a detailed post on all this?

i cant recall any tdv8 4.4 egr's failures being mentioned on the forum, they seem to be fairly robust...

might be wrong though.. ... - .- -.




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I never found any reference to EGR’s when compiling my 4.4 tdV8 Fault History Log.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
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Greg,
hair on the back of my neck stands up just thinking about all the soot and sludge going in to my cylinders, yak, yak . and what will happen if a chunk of it gets in between valve and a valve seat could be a very expensive job to fix it.
take the inlet manifold off, put it in a suitable plastic bucket with some diesel in it, use toilet brush to loosen the soot and finally clean with brake cleaner.



Nino


,

You're right of course Nino. But I was thinking about the turbo(s), and after the turbo where you can't as easily clean....
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway