So if you own or have done any reading on the TDV6 engine, be that the 2.7 or 3L that are found in the likes of the XF and S type Jaguar, in the Land Rover Discovery 3 or 4 and in most Range Rover models, you will know that a reasonably common issue is the EGR (exhaust gas recycler) valves.
These two valves which reside on each side of the engine, are tasked with allowing exhaust gases to be recirculated back through the induction and combustion chamber for the purpose of emissions control. Now these valves are prone to failure but this post isn't about them, its about a byproduct of their use in the engine. So what happens in the induction system?? The emissions enter the induction system just after the throttle body and mix with the intake air and a quantity of oil from the PCV (a byproduct from normal engine use). This is where the problems start. When the oil and emission mix, they stick to the walls of the induction system and residual engine heat bakes it on. So over time, layer after layer of this carbon/oil mix builds up in the induction system, until there are significant deposits throughout the induction, from throttle body to the back of the valves. So why is this a problem?? Well there are a lot of problems associated with these deposits. One we see often, is a blocked map sensor on the throttle body. Another issues include; a decrease in performance over time due to intake flow restrictions; EGR faults due to severely blocked EGR pipes; rough running engines and uneven idle. To fix it? There are a lot of products on the market for induction cleaning such as; Sea Foam, Liquid Molly, BG induction cleaner, Nulon etc. Some products I'm sure are very good, however they are really only useful when used throughout the vehicles service life. When a vehicle has significant deposits of carbon and sludge build up, there is only so much these products can do. Unfortunately the best fix is dis-assembly and manual cleaning. This can be expensive but is worth it as it will increase the performance and reliability of the engine, as well as extend its life. At Pickards we manually clean all the induction parts with solvents and use a walnut shell blaster for cleaning the ports of the heads and the backs of the valves. We find that this is by far the most successful way of cleaning the ports (see here for an example on a bmw www.youtube.com/watch?v=ONp6gQXpyKU ) If you own a newer vehicle or have had a full induction clean done on your vehicle the good thing is there is an easy way to keep the induction clean. This involves having regular induction cleans when having your vehicle serviced. I generally do it every 20,000 to 30,000 km. At this interval the induction sludge and carbon build up can be removed by a good quality induction cleaner as it hasn't had sufficient time to harden and collect. For the ongoing cleaning of the induction during servicing we use a product, Prostream 1000, that is run through the entire induction system including the turbos and ERG valves. We have had a lot of success with this product. Should you have any queries about the induction clogging issues or induction cleaning please contact me at www.pickardsautomotive.com.au or at (03) 9428 9655.
9 Comments
8/22/2017 10:59:27 am
This is a very informative blog about Land Rover and Jaguar TDV6 induction cleaning and maintenance. These information really helps the owners.
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2/27/2018 11:43:01 pm
Vehicles are nothing but machines and needs maintenance at a regular interval. Luxurious vehicles like Jaguar and Land rover needs proper maintenance to ensure smoother and effective performance. And, this blog comprises some very important information regarding maintenance of such luxurious vehicles.
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6/2/2018 09:54:20 pm
Nice post, thanks for sharing it with us. Land Rover and Jaguar are luxurious vehicles and need proper maintenance service so that these last in best condition for a longtime.
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Bryan Jackson
6/3/2018 02:53:44 pm
I have a Range Rover 2.7 diesel sport I get continual blocking of the
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John. A. Farrar
7/26/2018 07:59:56 pm
G;day, we are just experiencing clogging of the EGR valves on our RR TDV6 2.7, can you advise the best cleaning solvent or system we can use (and how to apply same) without the total dismantle process.
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Tlou
7/5/2019 12:13:39 pm
You need to drive this cars long distances .They are not ment to drive around
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12/12/2018 08:41:23 pm
Nice blog.. you provided very useful information about the maintenance service of luxurious vehicles. These luxurious vehicles like Land Rover and Jaguar need proper maintenance service at a regular interval for good performance. Thanks for sharing it with us.
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Jim CAS
9/27/2019 06:35:21 pm
Very interesting article to say the least. Are you able to provide some clues as to how I can detrect the level of build up of deposits, before I sek to have any rectification work done. I live in Canberra, and would welcome a recommendation on who might be in a position to do any work, if deemed necessary on a Discovery 4 - 3 lire.
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