part 2 scv glow plugs and egr bypass with pics

[loot]

Right I'm in agreement with you, the bit I'm stuck at is if the egr is closed and the extra pressure isn't felt by the maf that's when the code comes up?
Does the extra back pressure in the exhaust cause problems for the turbo? Similarly to a blocked dpf?
Is there a sensor that monitors exhaust back pressure?
Will the lack of nox and egr operation cause engine wear at higher temps due to not having the cooling effect?
And would creating a variable output to the maf to make it think it is range and remove the warning lamp?
Also the egr pcm operates the loop system? Would linking the output of the motor to the variable resistor that monitors the egr valve position to the maf input(indirectly) cause a feedback?(what I'm asking here is if we were to use the motor to control the egr pos sensor, then modify an output that is accepted by the maf within tolerable levels would the pcm still see other sensor faults?) I.e temperature, barometric or pos??
And does the maf only monitor air flow/pressure? Not temperature?
This is all i can think of at the MO

Thanks for reading guys i know I'll probably hit a brick wall but I'm interested in all this!

[Guy88]

Right I'm in agreement with you, the bit I'm stuck at is if the egr is closed and the extra pressure isn't felt by the maf that's when the code comes up?
Does the extra back pressure in the exhaust cause problems for the turbo? Similarly to a blocked dpf?
Is there a sensor that monitors exhaust back pressure?
Will the lack of nox and egr operation cause engine wear at higher temps due to not having the cooling effect?
And would creating a variable output to the maf to make it think it is range and remove the warning lamp?
Also the egr pcm operates the loop system? Would linking the output of the motor to the variable resistor that monitors the egr valve position to the maf input(indirectly) cause a feedback?(what I'm asking here is if we were to use the motor to control the egr pos sensor, then modify an output that is accepted by the maf within tolerable levels would the pcm still see other sensor faults?) I.e temperature, barometric or pos??
And does the maf only monitor air flow/pressure? Not temperature?
This is all i can think of at the MO

Thanks for reading guys i know I'll probably hit a brick wall but I'm interested in all this!

the MAF is befor the turbo so doenst see any pressure, it just works out the airflow with EGR open and closed,

the EGR is pre turbo so wont alter the backpressure, if anything with it closed the turbo will spool quicker

there is no sensor for back pressure,

tbh if you want to disable the EGR then get martyn to do it, he id doing all you say via a map so the engine thinks that the EGR shouldnt work and the MAF map is altered to suit

[loot]

Cheers guy, i started the whole thing as replacing the prv and scv and a clean out so that's why I've delved draper into the guts of it, i wouldn't have started the whole thing with the intention of messing with the egr system, as you say the hassle of it all its easier to get Martyn to do his magic!

I'm gonna see where this leads me until i get bored lol

[martynx]

Regarding the higher temps being a problem ( with a disabled/blanked Egr) the Egr only works at just after idle till 2500, it's fully closed by 3000rpm, the highest temps are created 'naturally ' after 3k so running a slightly higher temp at say1k to3k has no measurable negative affect on anything other than em missions

[martynx]

About arranging resistors etc to fool the ecu , it's a way of overcoming the Egr for a few pounds / pence for sure but it's not been done yet on our visteon controlled engines ... I hope somebody with that kind of electronics knowledge works it out...

my own earlier MK1 Egr off solution which played with temp switches and ' levelled' map values lit the MIL so the MIL Itself needed disabling , they are a really sensitive system!!

[loot]

Thanks Martyn some good info, if nothing comes of it at least its of educational value to us all.

[hawkander]

Hi, I`m new to this site, but `i`m trying too find a solution to a problem I have with my Peugeot Boxer, which is fitted with the Puma engine and which I believe is in Ford transits. I realise this may appear a bit of a cheek, but have tried 2 Peugeot forums and although my question has been viewed, I `ve had no feedback. I have a 2007 Boxer 2.2 with 21k, so low mileage, it has the EML on all the time and the fault has been diagnosed as the EGR. The van runs well, albeit a little chuntry on tickover , but no real drop in performance and in fact it does around 40 mpg, which is brilliant. Can the EGR be cleaned easily and if so how accessible is it or should I just replace it and if left as it is, will it do any damage to the engine or turbo? Many thanks for reading my post!

[loot]

I can only partly answer that 1 but I'll try, my van is the 2.4 puma engine and the egr(non water cooled) is quite a simple device with a motor and potentiometer i found mine was clean internally compared to my intake which was caked in oil residue.
My egr works but i imagine if it was faulty it would either be bad electrical contacts/potentiometer or a burnt/damaged valve or gear.
Can you get a more specific fault code from it?
I got p0404 egr range(probably potentiometer related)i removed the gear that opens it.
P1xxx orifice restricted
P1xxx something else
Sorry i forget what that was lol but the 2 lower faults were manufacturer specific and only when i unplugged it which means they aren't sensing the position sensor or other.

If you need me to be more specific I'll try.

But basically I'm not sure cleaning it will help as there are no sensors in it to get clogged up so you are looking at more likely physical wear of the unit (I'd personally take it apart and see what is what, you can buy a replacement top piece that has the electronics in but
I'm not sure if that is false economy?
I hope any of this makes sense?

Also make sure it its definately the egr at fault i don't want to tell you to replace it until you know it is at fault.
It'll need fixing anyway as ppl are saying its an mot failure now i think?(warning light)

[Guy88]

egr is easy on the 2.2, sits above the starter on the front of the engine

[hawkander]

thanks for the info, but i `ve looked on youtube and they show people cleaning them with Carb cleaner, when they get choked up, but although I think I know it`s location, it looks like a pain to get to, was wondering if it is worth the aggravation if it is not causing any damage in the long term? You mentioned MOT failure with the eml on, is that something recent, as I have put 2 cars thru with lights on and they passed?

[loot]

Yes it is but i know nothing about it sorry just what I've read.
Your engine is easier to work on than mine as guy says, since it is sideways in and not longitudinal.
There are many types of egr valve but i can only comment on mine. If you look in the pics you may see if its the same as yours and you'll see what you need, cleaning it may help but i suggest you try and get the exact fault code read since the 3 codes i got told me which part of the egr is wrong.

[hawkander]

thanks again , will try and do some work on it, when work and weather permits.

[martynx]

thanks again , will try and do some work on it, when work and weather permits.

depending on what the exact Egr fault is
It may not be a good idea to leave it faulty , but if your happy to have the EML on, fitting an Egr blanking plate would be your best option .. as the plates are on £5 and DIY job to fit but if the EML affects the Mot then it's better to replace the Egr , it won't be cured by cleaning in any way as the faults are gearbox wear or electronic failure on that series of Puma Egr ..

Unplugging the electrical connector is something you could try straight away- if that cures the idle issue then you know your Egr isn't closing correctly and needs blanking / replacing..

[loot]

Just a little update as i haven't forgotten this lol, i put my ms509 on live data on my van without egr plugged in and i think it is showing 5000lb maf at 2500 revs and map 30.
My boss van (same) but with egr connected is showing 3000lb maf and 30, map.
I'm getting maf too high fault so it seems I'm having too much air flow without having the egr back pressure to slow the airflow speed down to the maf.
This is just assumptions at the MO but I'll keep on,i haven't spent long on it and am not spending money so i don't mind as it's just for fun, the van runs no different so if it was just a case of lowering the output of the maf then happy days but surely to God that is too easy isn't it??

[winterheating]

If working correctly, as the egr valve recirculates exhaust gas back into intake, then the amount of fresh air needed will be reduced as less oxygen means cooler combustion temps, so less air flow past maf, than with a egr valve disabled. One if the reasons why the pcm puts the light on. So therefore must be totally closed??? But is always best with the blanking plate as well...