EGR Removal

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white exec
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Re: EGR Removal

Post by white exec »

Cleaning might need something a bit stronger than IPA (isopropyl alcohol) - something like percholoroethylene ('perc')' aka tetrachloroethylene, aka dry cleaning fluid. Not something (along with all the carbon) you'd want to wash into the engine, so the intake manifold really ought to come off - either that, and/or head off ?

Seeing that sort of blocking on a modern, highly engineered engine just makes me despair. I know this is something the forum just has to get used to seeing. What a swansong for ICE.
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Re: EGR Removal

Post by dave_xsara »

myglaren wrote:
01 Feb 2020, 22:54
Dedicated EGR cleaner or carburettor cleaner - probably the same thing and mostly isopropanol I expect.
Is the liquid moly stuff any good? I'm not sure about dumping the contents of the intake into the cylinders incase I wreck the engine.

https://products.liqui-moly.com/pro-lin ... sel-4.html

Thanks.
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Re: EGR Removal

Post by dave_xsara »

white exec wrote:
02 Feb 2020, 20:40
Cleaning might need something a bit stronger than IPA (isopropyl alcohol) - something like percholoroethylene ('perc')' aka tetrachloroethylene, aka dry cleaning fluid. Not something (along with all the carbon) you'd want to wash into the engine, so the intake manifold really ought to come off - either that, and/or head off ?

Seeing that sort of blocking on a modern, highly engineered engine just makes me despair. I know this is something the forum just has to get used to seeing. What a swansong for ICE.
Is live to take it off and clean it but I think the exhaust manifold has to come off in order to gain access, so it's too big a job considering it is not actually blocked.
Yes, washing all that gunk into the cylinder wires me so I don't know how to proceed from here.

So many on here block the egr off with the blanking plate? At least things would not get worse and as there is no emissions tests it won't be a risk for mot.
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Re: EGR Removal

Post by myglaren »

dave_xsara wrote:
02 Feb 2020, 23:56
myglaren wrote:
01 Feb 2020, 22:54
Dedicated EGR cleaner or carburettor cleaner - probably the same thing and mostly isopropanol I expect.
Is the liquid moly stuff any good? I'm not sure about dumping the contents of the intake into the cylinders incase I wreck the engine.

https://products.liqui-moly.com/pro-lin ... sel-4.html

Thanks.
I couldn't say, never used it.
The only thing I have used is carburettor cleaner on the MAF.
I did have the EGR and all associated pipework removed and cleaned, along with a new intercooler, which made an unbelievable difference to the performance.

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Re: EGR Removal

Post by dave_xsara »

Did you blank it off or keep it operational?
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Re: EGR Removal

Post by GiveMeABreak »

Sorry, but as to blanking the EGR - no - we don't condone it here and it's not a topic for further discussion as it's illegal in the UK for public road-using vehicles (emissions defeating) (see AUP 7.1). :wink: I know these are not ideal and do ultimately clog over a long period - but it's what we have with the modern diesels.
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Re: EGR Removal

Post by wheeler »

dave_xsara wrote:
03 Feb 2020, 10:57
Did you blank it off or keep it operational?
I’ve replied by PM as my post has been removed.
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Re: EGR Removal

Post by dave_xsara »

Is there a way to determine the required vacuum for opening the egr? Is it in the specs anywhere - I've tried to manually open it and the return spring is really strong.
I also tried the below and was barely able to move it.
IMG_20200131_201925.jpg
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Michel
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Re: EGR Removal

Post by Michel »

The EGR was gummed up on my 2003 BMW 320 SE Tourer a couple of years ago. I just sprayed loads of carb cleaner over it and presumably it went into the cylinders. Never did any harm.
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Re: EGR Removal

Post by white exec »

If it's just soft/smooth soot that washes off, likely no harm. Chunks of dislodged hard carbon might not be so good. Not a job I've had to do, so no first-hand experience of the clag.
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Re: EGR Removal

Post by GiveMeABreak »

This is what I have:

Connect a vacuum pressure pump to the valve union (1).
Apply a vacuum of approximately 0.6 BAR several times in succession in order to activate the shaft "a".
When the vacuum is suddenly cut off, the valve should click as it returns to its seat.
Dave EGR.PNG
EGR Electrovalve check:

A vacuum check can be carried out between the electrovalve (2) and the EGR valve (1).

Connect the vacuum pump between the electrovalve (2) and the valve (1).
Compare the values read with those of the table below.
Engine SpeedVacuum Value
780 RPM0.5 BAR
2500 RPM0 BAR
Sharkie
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Re: EGR Removal

Post by Sharkie »

you can clean egr with petrol or diesel fuel. No need for fancy cleaners. If carbon is caked and baked on, only thing that will remove it is a tool. Blanking it will probably produce a fault on your ECU.
If there's a lot of garbage, only proper thing is to remove all parts completely and wash it separate. If those pieces fall into intake, they may jam a valve which is the end of the motor...
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white exec
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Re: EGR Removal

Post by white exec »

That was my concern: a lump of crud getting under a valve.
dave_xsara
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Re: EGR Removal

Post by dave_xsara »

Back on the road again. Idle is massively improved now. Almost no hunting at idle now. Car seemed a bit more sooty at idle though. Checked egr before putting it back on and was able to be driven open by a vacuum of less than 7psi and was able to hold the vacuum (gradual lid off vacuum, but that is accepted according to the you tube videos).
Took it out for a drive and the acceleration seems better, although that might be placebo affect.

Still to clean out the inlet but the spray hadn't came through yet, so that will be done next week.
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Re: EGR Removal

Post by dave_xsara »

Whilst diagnosing the P0110 fault (which is part of another thread) I decided to test egr electrovalve with a newly purchased vacuum tool just to see how it works.
At idle, there is no vacuum being produced. On the out from the electrovalve into the egr. There is a very healthy vacuum being produced from the engine up to input.
Is there any additional criteria for this electrovalve to be activated?
Marc's post defined that at 780rpm it should produce 0.5bar, but no additional steps in the test.

I have run the test from Lexia on the egr electrovalve and all it seems to do is fire up the relay unit beside the electrovalve.