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4th August 2022, 16:38 | #1 |
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MG ZT-T 160 Join Date: Feb 2010
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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.
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4th August 2022, 22:31 | #2 |
Gets stuck in
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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.
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5th August 2022, 08:36 | #3 |
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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??
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5th August 2022, 09:11 | #4 | |||
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Quote:
Have a lovely weekend and numb your brain with all of this below. https://www.the75andztclub.co.uk/for...ad.php?t=12517 Clean your manifold out also and wipe the MAP sensor clean. 1 3 4
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5th August 2022, 09:24 | #5 | |
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Quote:
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. |
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7th August 2022, 16:07 | #6 |
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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.
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9th August 2022, 15:58 | #7 | |
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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.
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9th August 2022, 16:02 | #8 |
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OK, but if it's there purely for emissions/pollution surely if I fit a blanking 'valve' then it won't pass emissions!
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9th August 2022, 16:04 | #9 |
Posted a thing or two
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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
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9th August 2022, 16:08 | #10 |
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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.
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