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EGR dismantle, clean, and motor test, with pics !!

122K views 72 replies 44 participants last post by  ours2012 
#1 ·
Hi all, posting my pics following an EGR overhaul on my 2006 plate Scenic Grand 1.9 DCi. Engine is the F9Q version 80 E I think?

**Please note I changed my glow plugs at the same time if this does not apply ignore some of the sections!**

Ok first things 1st before you even start make sure you have an ex torx socket if like my engine you have the external torx bolts on the EGR pipe, mine was an 8mm socket

The rest just involves your run of the mill spanner and socket set and a torx screwdriver set

I bought some carb cleaner in advance, take your pick there are many to choose from, i also had a little stiff brush (old toothbrush will do)

Disconnect battery

Remove the cover off car to expose the shroud covering your glow plugs etc (sorry if some of the terminology is not exact, i'm not a mechanic:d)

There are several things that I removed in order to make life easier and get better access, choose whatever suits you best.

Undo the plastic screws covering windscreen shroud
10mm plastc nuts and 2 x torx screws at each end
Remove the rubber strip and rubber stops at each end.

Auto part Motor vehicle Automobile repair shop Tire Automotive tire


Auto part Automotive exterior Bumper Vehicle Car


Automotive exterior Bumper Auto part Grille Hood


Auto part Automotive exterior Bumper Vehicle Engine


Vehicle door Auto part Tire Automotive exterior Automotive tire


Next remove the 1st piece of plastic shroud covering the windscreen wipers

Vehicle Car Auto part Automotive exterior Bumper

Auto part Vehicle Car Automotive exterior Bumper


Ok now pop of the three covers that hide the nuts securing the windcreen wipers, unscrew and remove, i didn't need a puller for mine they came off with ease.

I also removed the plastic covers in the corners


Vehicle door Automotive exterior Vehicle Car Automotive window part

Motor vehicle Auto part Automotive exterior Vehicle Windshield


Auto part Automotive exterior Vehicle Automobile repair shop Hood

Vehicle Auto part Automotive exterior Car Windshield

Vehicle door Automotive exterior Bumper Windshield Automotive design


Remove wipers

Next its time to start removing the firewall panels

note the position of the bolts, it comes aprt in two sections, smaller panel to the right (for access to air filer box) and larger panel to the left, jiggle it a bit to get it out or remove the pipes to manifold and remove shroud over glow plugs whichever makes life easier

Auto part Automobile repair shop Vehicle Automotive fuel system Engine

Automotive exterior Auto part Bumper Windshield Vehicle door

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Undo the two nuts holding this part of the manifold
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Auto part Engine Vehicle Automotive engine part Car

unclip the the pipe next to it
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Once done you can fold the flexible pipe out of the way to remove the shroud over the glow plugs
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Allowing access if you need to examine or change them

Next I removed the two ex torx bolts from the EGR pipe
Auto part Engine Vehicle Fuel line Automotive fuel system


Then remove the 3 bolts holding the EGR in place, last one at rear near bottom, I used a 13mm spanner

Auto part Fuel line Engine Carburetor Automotive engine part

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Once I did this I could wiggle the EGR out
This is what I saw

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Pretty carbed up!

So I cleaned it

Soil Wood Litter

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OK not content with that, I wanted to check the motor, I took the cover off (more torx screws) checked the cogs (no broken teeth) and then placed two spade connectors on the motor to test it on the battery, it span fine so I knew it worked:d

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I moved the cog by hand and the valve moved freely

Put it all back together and reassembled.

The valves cost in excess of £200.00 so for me it was worth checking and cleaning. Mine had stuck, it was burning loads of fuel, now closed:d

Hope this helps someone along the way
 

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#33 ·
Any similar bolt with the same thread should do although you may have to cut its length to suit.
In the meantime you could try the old engineers trick by cuting a slot across the head of the bolt using a course hacksaw - that way you may be able to sufficient purchase using a decent flat bladed screwdriver.
 
#35 ·
Thanks for all the help in this thread, but I have one more query regarding the EGR Valve.

When I switch the engine off the EGR makes a high pitched buzzing noise and it sounds like the valve is moving for a few seconds. The buzz stays there for a few minutes.

Is this normal?

Cheers :d
 
#37 ·
OK that's interesting to know, when I had it out to clean I checked that the valve opened and closed by removing the plastic cover and turning the cog wheel. It moved freely open and shut.

I'm wondering if this is an electrical fault, when the engine switches off I can hear the high pitched noise (almost like an alarm) and a bit of whirring which I presumed is the valve closing. The whirring stops almost straight away 3-5 seconds and the high pitched sound continues for about one minute and then stops.

What could this be as when I drove the car after cleaning the egr it runs better and is quieter than it did before?

Also if I blanked off the EGR valve would I not need to worry about it again anyway?

Cheers, Steve :d
 
#38 ·
For the motor to stop turning it will have an electrcial stop mechanism otherwise it would just attempt to keep on turning and burn itself out.

Sounds like this apsect of the Valve mechanism isn't working correctly.

You can blank off the exhaust feed pipe but disconnecting the EGR valve or if it ain't working correctly will probably throw up a fault
 
#39 ·
It's an annoying problem as I'm not sure if it's the EGR valve faulty or the electronic connector :confused:

Car is alot better and quieter since I have cleaned it and have had no Errors from the ECU so I think I'll just leave it, if I blank the EGR do I need to leave it plugged in?

Cheers,:cheers: Steve
 
#41 ·
I have a 06 plate Renault megane diesel estate 1.9 dCi which has
developed a "Check Injection" warning light and has lost most of the useful power.

It seems to be in a "maintence" mode or "get you home" mode so it runs albeit fairly roughly.

I wonder if anyone can help point me in the right direction - I.e what it could possibly be?

I have read that the EGR valve / sensor could need cleaning and cleaned the electrical connections as a preliminary test with no luck.



would like to try and understand this problem

:confused:
Thanks boo
 
#42 ·
TBH, it could be a lot of things. In my case it was actually 3 out of 4 dead glow plugs.

By all means, give the EGR valve a good clean and make sure it is working freely, then check the glow plugs then check the wires to the various sensors, MAF, boost, etc.

See how you go from there.

A
 
#44 ·
Hi Chrisstew

I am stuck in the part where you take off the cover of the engine to access the glow plugs.

Remove the cover off car to expose the shroud covering your glow plugs etc (sorry if some of the terminology is not exact, i'm not a mechanic)

I have Megane CC 1.9dci and the internals looks same as yours.

I have taken out two bolts which secure the cover and the plastic clips on the left and bottom.

It is loose but will not come off. :mad:



Do I have to

Undo the two nuts holding this part of the manifold unclip the the pipe next to it

to get access to the engine and glow plugs?

I want to check the glow plugs first before thinking about cleaning the EGR.

Thanks in advance!
 
#48 ·
I have a 1.9dci Scenic and have looked at a few of these egr threads now but none seem to show the same setup as mine. Mine is mounted on the rear of the engine and looks different to all the pictures I've seen. I do have a hissing noise on acceleration and a lack of power on occasions, Mpg is about 40 on a run and tick over can be awful on occasions. (Not all the time though) I'm keen to clean out the egr to see if this helps but a little wary as mine looks so different, either that or I'm looking at the wrong thing on my car.
 
#49 ·
Chris - I have an 05 Grand Scenic and want to unblock the drain holes under the windscreen wiper cover. I have had problems getting the windscreen wiper arms off and have given them a generous helping of WD40 to soak.

I thought I needed to do this to get the full cover off. However looking at your pictures it appears that the cover is in two parts, first part secured by 4 nuts and 2 screws and the over encased by the wiper blades. How are the two attached and can one remove the forward piece leaving the part encased by the wiper arms intact AND still get to the blocked drain holes? Mike
 
#54 ·
Beware those that consider running the car with the EGR valve blanked off. I have just read this:

"An EGR, or Exhaust Gas Recirculation valve is a means of reducing NOx (Nitrogen Oxide) emissions from your engine. The EGR valve, as its name suggests, re-circulates exhaust gases to act as a coolant in the combustion chambers.
Over time EGR valves become sticky and will eventually seize open or closed. If seized open the engine may idle poorly or even stall. If seized closed the engine will operate at increased temperatures under load and may cause "engine knock". This is especially bad for turbocharged vehicles, as the increased exhaust gas temperature can lead to premature failure of the turbocharger also."
 
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