Just What Good Is The EGR Valve?

Tasng4 · 4th August 2022, 16:38

On the way through France with a trailer I noticed a distinct lack of power as well as a plume of black smoke from the exhaust. Aha! I thought.....blocked/stuck EGR valve. I'll sort it once we arrive at our destination.

I had a look on Fleabay for EGR cleaner and up popped 'blanking valves', i.e. valves that do away with the EGR valve.

My question is what're the advantages (if any) and disadvantages (if any) of getting rid of the valve?

Thanks,

P.S. I cleaned the valve (325,000 kms and never cleaned as far as I know) and now I only have a grey plume of smoke, I assume the exhaust is cleaning itself.

Andy_with_a_screwdriver · 4th August 2022, 22:31

What an egr does do is cause a load of oily tarry crud to build up in the valve itself and the intake manifold. This is a picture of an egr probably ¾ obstructed, from my Vauxhall after about 14 years and 104k miles.

Tasng4 · 5th August 2022, 08:36

Well mine wasn't that bad, by comparison, just VERY sooty with lumps of carbon.

If the EGR valve collects all this carbon if it's not cleaned then surely if you swap it for one of the blanking 'valves' then this carbon has no where to go and will eventually damage the engine??

Arctic · 5th August 2022, 09:11

Quote:

Originally Posted by Tasng4

On the way through France with a trailer I noticed a distinct lack of power as well as a plume of black smoke from the exhaust. Aha! I thought.....blocked/stuck EGR valve. I'll sort it once we arrive at our destination.

I had a look on Fleabay for EGR cleaner and up popped 'blanking valves', i.e. valves that do away with the EGR valve.

My question is what're the advantages (if any) and disadvantages (if any) of getting rid of the valve?

Thanks,

P.S. I cleaned the valve (325,000 kms and never cleaned as far as I know) and now I only have a grey plume of smoke, I assume the exhaust is cleaning itself.

Hi Neil.
Have a lovely weekend and numb your brain with all of this below.

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Clean your manifold out also and wipe the MAP sensor clean.

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alan richard · 5th August 2022, 09:24

Quote:

Originally Posted by Tasng4

If the EGR valve collects all this carbon if it's not cleaned then surely if you swap it for one of the blanking 'valves' then this carbon has no where to go and will eventually damage the engine??

Without an EGR, the carbon will exit with the exhaust gasses. With the EGR it collects around the EGR valve mechanism (or condenses)

It's there to reduce NOx emissions.

(They say: the EGR valve allows a precise quantity of exhaust gas to re-enter the intake the system, effectively changing the chemical makeup of the air entering the engine. With less oxygen, the now diluted mixture burns slower, lowering temperatures in the combustion chamber by almost 150°C, and reducing NOx production for a cleaner, more efficient exhaust. )

I cleaned and blanked mine years ago. Not really noticed any performance difference.

Tasng4 · 7th August 2022, 16:07

Thanks to all who commented, the car continues to run better with a cleaner EGR valve. I will clean it properly when I get home in another 1000 miles.

I tend to side with the designers of the engine, why would it be there if it's not necessary so I don't think I'll bother with a bypass.

Au Revoir.

Avulon · 9th August 2022, 15:58

Quote:

Originally Posted by Tasng4

Thanks to all who commented, the car continues to run better with a cleaner EGR valve. I will clean it properly when I get home in another 1000 miles.

I tend to side with the designers of the engine, why would it be there if it's not necessary so I don't think I'll bother with a bypass.

Au Revoir.

It's there solely as an attempt at pollution prevention to comply with the most stringent of regulations (misguided or otherwise) for the markets where it would have been sold. Not for engine performance, or even economy. Not because the designers thought it a good idea. - they had no choice.

Tasng4 · 9th August 2022, 16:02

OK, but if it's there purely for emissions/pollution surely if I fit a blanking 'valve' then it won't pass emissions!

Mike Trident · 9th August 2022, 16:04

Mine has the Egr disconnected, passed its 4th or 5th mot since I disconnected it.

1.31 Is the limit mine measured 0.01.

Very clean running Rover 75

Tasng4 · 9th August 2022, 16:08

Oh! Why O why is there never a straight fwd answer? Mine's a French car and at the last MOT it tested 0.9 and the limit is 1.0 but that may be injectors.

We're in England ATM and I cleaned it here so I'll check after the 1,000 mile drive home.

4th August 2022, 16:38	#1
Tasng4 Avid contributor MG ZT-T 160 Join Date: Feb 2010 Location: Lus La Croix Haute, Drome, France Posts: 121 Thanks: 4 Thanked 9 Times in 7 Posts	Just What Good Is The EGR Valve? On the way through France with a trailer I noticed a distinct lack of power as well as a plume of black smoke from the exhaust. Aha! I thought.....blocked/stuck EGR valve. I'll sort it once we arrive at our destination. I had a look on Fleabay for EGR cleaner and up popped 'blanking valves', i.e. valves that do away with the EGR valve. My question is what're the advantages (if any) and disadvantages (if any) of getting rid of the valve? Thanks, P.S. I cleaned the valve (325,000 kms and never cleaned as far as I know) and now I only have a grey plume of smoke, I assume the exhaust is cleaning itself. __________________ You don't stop playing because you grow old, you grow old because you stop playing. It's better to have a gun and not need it than to need a gun and not have it.

5th August 2022, 08:36	#3
Tasng4 Avid contributor MG ZT-T 160 Join Date: Feb 2010 Location: Lus La Croix Haute, Drome, France Posts: 121 Thanks: 4 Thanked 9 Times in 7 Posts	Well mine wasn't that bad, by comparison, just VERY sooty with lumps of carbon. If the EGR valve collects all this carbon if it's not cleaned then surely if you swap it for one of the blanking 'valves' then this carbon has no where to go and will eventually damage the engine?? __________________ You don't stop playing because you grow old, you grow old because you stop playing. It's better to have a gun and not need it than to need a gun and not have it.

7th August 2022, 16:07	#6
Tasng4 Avid contributor MG ZT-T 160 Join Date: Feb 2010 Location: Lus La Croix Haute, Drome, France Posts: 121 Thanks: 4 Thanked 9 Times in 7 Posts	Thanks to all who commented, the car continues to run better with a cleaner EGR valve. I will clean it properly when I get home in another 1000 miles. I tend to side with the designers of the engine, why would it be there if it's not necessary so I don't think I'll bother with a bypass. Au Revoir. __________________ You don't stop playing because you grow old, you grow old because you stop playing. It's better to have a gun and not need it than to need a gun and not have it.

9th August 2022, 16:02	#8
Tasng4 Avid contributor MG ZT-T 160 Join Date: Feb 2010 Location: Lus La Croix Haute, Drome, France Posts: 121 Thanks: 4 Thanked 9 Times in 7 Posts	OK, but if it's there purely for emissions/pollution surely if I fit a blanking 'valve' then it won't pass emissions! __________________ You don't stop playing because you grow old, you grow old because you stop playing. It's better to have a gun and not need it than to need a gun and not have it.

9th August 2022, 16:04	#9
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Mine has the Egr disconnected, passed its 4th or 5th mot since I disconnected it. 1.31 Is the limit mine measured 0.01. Very clean running Rover 75 __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s

9th August 2022, 16:08	#10
Tasng4 Avid contributor MG ZT-T 160 Join Date: Feb 2010 Location: Lus La Croix Haute, Drome, France Posts: 121 Thanks: 4 Thanked 9 Times in 7 Posts	Oh! Why O why is there never a straight fwd answer? Mine's a French car and at the last MOT it tested 0.9 and the limit is 1.0 but that may be injectors. We're in England ATM and I cleaned it here so I'll check after the 1,000 mile drive home. __________________ You don't stop playing because you grow old, you grow old because you stop playing. It's better to have a gun and not need it than to need a gun and not have it.