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Hi Everyone,

Please could somebody help clear up some questions that I have regarding EGR Blocking?

I've taken a look at some threads both here and on a couple of other forums and searched on Google (The "Big G").
I'd like to use the image provided by FarmerPug as a reference.
(I hope that you don't mind FarmerPug) http://i908.photobucket.com/albums/ac28 ... dImage.jpg

I'd like to refer to the two outermost points indicated by the blue arrows (marked in biro) upon the image as point A (Left most arrow, air intake flange)
and point B (rightmost arrow, exhaust manifold flange)


This has raised the following questions:

There seem to be three ways of disabling an EGR:

1 Insert a blanking plate at point A, preventing exhaust gas entering the intake.
Does this lead to a fault being logged?

2 Insert a blanking plate at BOTH points A & B, preventing exhaust gas exiting the exhaust manifold.
I believe that this is the most desirable approach and would avoid a fault being logged?

3 Disconnect the cable to the EGR valve.
I believe this is undesirable as the ECU will log a fault?

As I understand it; option 2 is the most favourable as it prevents exhaust gas entering the EGR and prevents it entering the Intake?

Assuming that no change to the ECU programming is made, please could someone tell me:

Is option 2 the most viable/desirable?
Does option 2 lead to a fault being logged?

How does Option 2 compare to Option 1?

Thank you :-)

hello there, I cant remember if you have told us what flavor HDI you have,


i had the 90 on a 2000 plate and went with the third option of removing the vacuum pipe from the solenoid on the bulk head and it never flagged a problem with the ecu,

i ran it like that for a good 5-7k miles, its a quick and easy way to try it out before you go the whole hog of purchasing blanking plates etc etc, i found it to be a slight improvement over standard but only a slight one so im glad i didnt spend any cash on achieving it.

Hi DiscoPol,
thank you for the reply.

DiscoPol wrote:hello there, I cant remember if you have told us what flavor HDI you have

It's a 51 plate HDi 90bhp - no modifications

DiscoPol wrote:i had the 90 on a 2000 plate and went with the third option of removing the vacuum pipe from the solenoid on the bulk head and it never flagged a problem with the ecu,

i ran it like that for a good 5-7k miles, its a quick and easy way to try it out before you go the whole hog of purchasing blanking plates etc etc, i found it to be a slight improvement over standard but only a slight one

I have heard of that technique, but I believe that the fault code appears after a number of miles - around 60-70 I think - although I can't find that post at the moment.

DicoPol wrote: so im glad i didnt spend any cash on achieving it.

I've already started making my own blanking plates in anticipation - I've generally got a few odds and ends lying around for "experiments".

The big concern is the fault codes - I bought an ODBII<----->USB ELM327 cable, so that I could clear any mysel, but I don't think that my car is OBDII as the pins on the diagnostic socket don't seem "complete" and testing a couple of pieces of software failed to connect to the ECU.
So I guess it's PP2000?

Does anyone have any further information that may be relevant? (Both EGR & Code reading?)

Thank you all

Hi again everyone,

could anyone clarify my query:

bytecode wrote:How does Option 2 compare to Option 1?

Where:

bytecode wrote: 1 Insert a blanking plate at point A, preventing exhaust gas entering the intake.
Does this lead to a fault being logged?

2 Insert a blanking plate at BOTH points A & B, preventing exhaust gas exiting the exhaust manifold.
I believe that this is the most desirable approach and would avoid a fault being logged?

As I'd like to experiment with "blanking" this weekend (if domestic chores and weather permit) and I'm wondering which is "best" from a results and economy/performance perspective (I know - it's only a minor improvement - but every little bit helps doesn't it?)

Also I'm still concerned re: Fault Codes. Has anyone conducted an extensive test on a 51 HDi 90?

Thank you :-)

It will generate a fault code if you disable it electrically because it checks for continuity through the soleniod valve and for power to work it, before you start the engine.

It's got no way of knowing if you disconnect / plug the vacuum pipe & you can 'undo' this easily.

I don't know what effect physically blanking it will have, but would not expect it to be able to tell the difference.

dogslife wrote: I don't know what effect physically blanking it will have, but would not expect it to be able to tell the difference.

Ok, thank you. Does anyone else have any first hand experience of physical blanking?

I only ask as I'm "terrified" of a fault code and an expensive trip to a dealer to clear it.

(Curse Peugeot and their proprietary OBD system! Proprietary is such a pain. Things are always better when open, well defined standards are adhered to..)

IIRC FarmerPug bought a blanking kit off eBay a month ago and did his
Give him a pm

Ok, so I decided to give it a go.
I undid the three bolts on the "intake" end of the EGR and removed the little metal gasket.
I used this as a template to draw around on a piece of metal lying around in the garage.
I cut this new "plate" out and inserted it in-place of the gasket.

Getting the bottom bolt in was a little bit swear-inducing - but I managed it in the end.

Driving results-wise:
* Slightly-less lag when needing the power, it feels more "immediate".
* Fuel economy - no major difference - but I am driving "harder" these days - still trying to get up those hills.
* No warning lights/diagnostics issues.
* Exhaust - still looks nice and clean

Is it really July already? Where's all of the time gone!?

bytecode wrote:Ok, so I decided to give it a go.
I undid the three bolts on the "intake" end of the EGR and removed the little metal gasket.
I used this as a template to draw around on a piece of metal lying around in the garage.
I cut this new "plate" out and inserted it in-place of the gasket.

Getting the bottom bolt in was a little bit swear-inducing - but I managed it in the end.

Driving results-wise:
* Slightly-less lag when needing the power, it feels more "immediate".
* Fuel economy - no major difference - but I am driving "harder" these days - still trying to get up those hills.
* No warning lights/diagnostics issues.
* Exhaust - still looks nice and clean

Is it really July already? Where's all of the time gone!?

Nicely done, could do that on my 2.2 sooner or later