Benefits/downsides on removing EGR valve

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m500dpp

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If I remain solvent after getting the oil leak and graunching fixed I am looking at removing the EGR valve, or at least blanking it off - have read the guide on here and also on the TD5alive site.

It appears all good news, but is there a downside I have missed?

What are everyone's experience, before and after?
 
Last edited:
No downsides under the current mot regs.

I've done quite a few TD5's and these are the benefits I've noticed:

1. Smoother tickover;

2. Smoother pickup of engine revs;

3. better low power, shown when climbing hills;

4. Slight improvement ln mpg;

5. Smoother engine overall.

You will get some or all of these benefits depending on how dirty your EGR valve and inlet manifold.

The improvements are not huge, but noticeable.

You will get more of the benefits if you remove the valve rather than just blocking it off.

Other cheap mods for improving the engine efficency:

1. Check and clean out the red plug on the ECU - with switch cleaner ideally.

2. Replace the catted downpipe with a non cat one;

3. Wash-out the intercooler.

4. Remove the MAP (on the inlet manifold) clean with brake cleaner then switch cleaner the contacts and reinstall it;

5. Clean the MAF and AAP with switch cleaner.

6. Obviously put in a new air filter - they breath deep!

Cheers
Dave
 
I've just brought my first late 300Tdi with some of the electrical gubbins so will definately be going through that list next weekend.
 
For DI TDi 300 the single best value modification for improving engine efficiency is, without doubt a non-cat downpipe. They can be bought for £18 to £25 and will save money on fuel.

So anyone new to Tdi 300 Disco's really should look to doing De-EGR and De-Cat with an intercooler and inlet manifold clean - this makes a remarkable difference to a TDi 300.

Good luck guys

Dave
 
Brian S said:
I've just brought my first late 300Tdi with some of the electrical gubbins so will definitely be going through that list next weekend.
Click to expand...


Just to be clear, from my list of sensors most of those are found on DII TD5 not TDi 300.

There's no electronics on a manual gearbox TDi 300 and on the auto-box version the only item on my list is the MAF.

The best things to do as I said above are the De-cat and De-EGR, plus of course new filters, new oils, clean out the inter-cooler, inlet manifold, fuel sedimenter and the filter in the top of the lift pump. Also ensure you pump a good dollop of grease into the prop-shafts & u/j's to ensure as little friction/drag.

Basically every time I get another Disco I go through it from front to back, irrespective of what the service history might say - I want to know for sure what's been and how. This gives me a. a good baseline for future service & b. a reliable and efficient Discovery.

I've never had one break down of me and they all delivered on average 33mpg. Preventative maintenance is my way of working, especially as LR parts are so cheap!!



Dave
 
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Mine is an auto. I realised it after I posted. Just wanted to subscribe so I could have your list.

I have a decat pipe and de egr kit ready and also a very clean inlet manifold. I'll see what the intercooler looks like before I remove it. If the inlet is bad then the intercooler will get a clean.

I have my old disco as a doner so very handy. :)
 
Some excellent tips here, Just got a TD5 in very nice condition (to look at), so I want to learn how to maintain it myself, and the above list looks a great place to start. Thanks to Sierrafery for pointing me here :)
 
thebiglad said:
No downsides under the current mot regs.

I've done quite a few TD5's and these are the benefits I've noticed:

1. Smoother tickover;

2. Smoother pickup of engine revs;

3. better low power, shown when climbing hills;

4. Slight improvement ln mpg;

5. Smoother engine overall.

You will get some or all of these benefits depending on how dirty your EGR valve and inlet manifold.

The improvements are not huge, but noticeable.

You will get more of the benefits if you remove the valve rather than just blocking it off.

Other cheap mods for improving the engine efficency:

1. Check and clean out the red plug on the ECU - with switch cleaner ideally.

2. Replace the catted downpipe with a non cat one;

3. Wash-out the intercooler.

4. Remove the MAP (on the inlet manifold) clean with brake cleaner then switch cleaner the contacts and reinstall it;

5. Clean the MAF and AAP with switch cleaner.

6. Obviously put in a new air filter - they breath deep!

Cheers
Dave
Click to expand...

Just a quick question, I noticed that post is nearly a decade old. Is it still as relevant/true today? I am considering working through that list starting with EGR blank/removal.
 
john snoo said:
Just a quick question, I noticed that post is nearly a decade old. Is it still as relevant/true today? I am considering working through that list starting with EGR blank/removal.
Click to expand...

If your egr is working you will not really notice any difference, but like all egr systems it will go wrong sooner or later and leave you in a jam on a dark windy wet night in your best clothes 300 miles from home!
Prevention is better than cure.
 
Nodge68 said:
Be aware that EGR removal is now an MOT failure, if it's spotted by the MOT tester.
Click to expand...
Hi Nodge, you're right of course, but on TD5's for example you'd be hard pressed to see that the EGR valve is missing, and I think I'm right in saying that it wouldn't show from the OBD socket
 
thebiglad said:
Hi Nodge, you're right of course, but on TD5's for example you'd be hard pressed to see that the EGR valve is missing, and I think I'm right in saying that it wouldn't show from the OBD socket
Click to expand...

It is well hidden, and as the MOT tester isn't allowed to remove the cover, it's difficult to spot, unless of course they know what to look for.

It won't show on an OBD2 check, so you should be OK.
 
Agree with the above, but wouldn't it be simpler to just take it off, clean it and put it back on?
I have NEVER seen any improvement in performance as a result of de-EGRing both my D1 300tdi, nor my TD5. ;)
 
Intestinalworm said:
Very easy to remove (I'm a novice and I did mine in an hour) - kits all over the place (got mine from X8R.co.uk).
Click to expand...
Out of interest, what made you decide to do it and did you notice any difference?

Stanleysteamer said:
Agree with the above, but wouldn't it be simpler to just take it off, clean it and put it back on?
I have NEVER seen any improvement in performance as a result of de-EGRing both my D1 300tdi, nor my TD5. ;)
Click to expand...
Interesting. I generally don't change stuff unless there's a definite good reason. A few people I know said they noticed quite a difference on TD5 WHEN COMBINED with other things, which of course begs the question, did the EGR make any difference?! Hardly a controlled study, I will have to look for something like that. Cleaning it would definitely be worthwhile, after all dirt is never good, unless its in my wife's mind (which hasn't happened yet but I live in hope, 30 years and counting) :D
 
john snoo said:
Out of interest, what made you decide to do it and did you notice any difference?


Interesting. I generally don't change stuff unless there's a definite good reason. A few people I know said they noticed quite a difference on TD5 WHEN COMBINED with other things, which of course begs the question, did the EGR make any difference?! Hardly a controlled study, I will have to look for something like that. Cleaning it would definitely be worthwhile, after all dirt is never good, unless its in my wife's mind (which hasn't happened yet but I live in hope, 30 years and counting) :D
Click to expand...
What made me change them was two things.
One, the alleged improvement in performance.
Two, the fact the thing gets dirty and possibly sticky.

One never happened, but two did as there is no longer a direct connection between the exhaust and the inlet manifold, which TBH I think was always going to be fecking stupid.
So I did it the second time for reason number two only.
But once it is clean, if you simply blank off the tube leading from the turbo, it would keep it clean and be much harder for an MOT inspector to spot. Or you could simply remove the blanking plate before the MOT and put it back afterwards.
Mine passes each time cos either the inspector sees it and can't be fecked, or he doesn't see it cos he'd have to look quite closely, with the engine cover on anorl.
TBH if you want a quick and relatively cheap performance boost, which requires no retuning and keeps or improves mpg etc, fit a performance exhaust.
Made a massive difference to the 300tdi, didn't bother with the TD5 as it goes OK for what I want.
 
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