EGR blocked now stalls very easily

[hungabunga]

I have been reading the EGR post and thought I would block the tube off and try it out, all went well and I took it for a drive.
It now seems the car stalls very easily and I have stalled it 3 times now and previously I have never stalled it in 2 years of ownership. Also if cruising at steady rpm and I press the accelerator the car seems to hesitate before accelerating. I thought blocking the EGR would do the opposite and make accelerating from steady rpm better.

I will be removing the blockage tonight and see if the car returns to normal.

Car is a 2004 Seat Leon PD130 and so far no CEL after about 15 miles of driving.

Thanks

Sully

 

[UncleFester]

How many miles has the car done?

 

[glynnd]

I tried it on my pd150 cupra and exactly the same thing happened. I have turned down my egr with vag com but it does not make a noticeable difference.

 

[hungabunga]

UncleFester the car has done 45K and has never had a problem

glynnd glad to see it is not just me, I have been reading the forums for ages and never seen anybody mention this problem.

Thanks

Sully

 

[UncleFester]

I tried it on my pd150 cupra and exactly the same thing happened. I have turned down my egr with vag com but it does not make a noticeable difference.

I didn't think you could turn down the EGR with vagcom on a PD150 - if you have and it worked, could you post up how you did it?

 

[glynnd]

Here it is fester

With the engine warmed up and running at idle in neutral with all major accessories such as air conditioning turned off, connect the scan tool cable and start the scan tool software.

[01 - Engine]
[Login - 11] and enter 12233 as the access code
[Adaptation] and go to block 3.
Give the accelerator pedal a quick "blip" to ensure that the EGR remains turned on for the next minute while you perform the following steps.
Note that the display shows a default adaptation value of 32768 and shows approximately 250 +/- 20 mg/stroke of air intake volume.

If all is well, enter 33768 as the new adaptation value, and select "test". Note that the displayed air intake volume changes, usually to about 370 mg/stroke. The specification limit is 370 mg/stroke, so if you want to remain within OEM shop manual specifications for emission control reasons, you might have to enter a number slightly smaller than 33768. (If you don't care about road-legal NOx emission limits then leave it at 33768. [Depending on the usage cycle, NOx at this setting can be increased by as much as 40%]) If all is well and you have a setting that you are happy with which results in an intake air volume of 370 mg/stroke or just a hair less, enter [Save]. The values aren't exactly the same, but when you enter the value 33768, the ECU will automatically adapt it. In my case it was something like 33628. 370mg/stroke is what your looking for

 

[UncleFester]

Thank you very much! I've been trying to find someone with a Leon PD150 who's done this successfully! If that's the EGR turned down ( effectively disabled) then i'll plug the vacuum hose back onto the EGR and lose the CEL.

 

[hungabunga]

I will have a go with vagcom tonight, anybody got ideas on why blocking the pipe is causing problems

Thanks

Sully

 

[glynnd]

I actually fitted a bleed valve in the line to the egr it didnt bring the light on but the car had slight hesitation on light throttle. I wonder if fitting a one way valve will allow this to work without putting the light on.

 

[hungabunga]

I will give vagcom a go tonight as blocking the pipe did not bring give me a CEL. Hopefully my car missed out on the smart cpu that know when the egr is turned off.
Will report back tonight

Sully

 

[FabiaTDi]

I experienced engine shudder when turning off with the EGR vacuum plugged.

Come to think of it I remember stalling too.

Mine was connected back up as it was annoying. EGR not blocked up at all and fairly soot free after 60k although perhaps it was turned down/off when mapped by Jabba.

 

[muddyboots]

I experienced engine shudder when turning off with the EGR vacuum plugged.

Sounds like you plugged the ASV pipe instead of the EGR ?

 

[hungabunga]

The egr valve is the silver ufo shaped device, I checked the pictures in the other thread to make sure. anyway this has just reminded me to have a go with vagcom

Thanks
Sully

 

[FabiaTDi]

Sounds like you plugged the ASV pipe instead of the EGR ?

I plugged the pipe leading to the EGR (silver UFO shaped) valve. Pretty sure I got it right.

 

[muddyboots]

That's a bit odd, as the engine would shudder more when switching off if the ASV wasn't working/connected (ASV = Anti Shudder Valve).

Wonder if your vac pipes have got switched ?

 

[Triple D]

Richard @ forge commented on mine when i turned it off as he said it shuddered a slight bit more when turning it off, but as you know my EGR was completely taken off and replaced with a pipe.

Had the Engine management light on most the time but never found it easyer to stall it tbh, and dont think i did all that often either.

 

[hungabunga]

O.k I messed with it last night and it let me turn down the egr through vagcom. I still wasn't happy that I could not block the egr so I removed the screw and replaced it with a large bit from my screwdriver set. The laptop was still plugged in and the reading went up from 370 mg/stroke to 440 mg/stroke. I took the car for a drive and it worked fine no problems accelerating.
It seems that the screw I had used to block the pipe was maybe letting vacuum past and then taking longer for the vacuum to be released causing the egr to stay open longer.

The only bad thing is that the CEL light is now on so which should I keep

With the pipe blocked I get reading of around 440 mg/stroke and with the egr turned down I get 370 mg/stroke

Thanks

Sully

 

[glynnd]

440 is too high you need to re connect the egr if you have turned it down with vag com. I have heard that total disabling of the egr can lead to premature turbo failure. I got this from my mate who has worked on vw group cars for 20 years so be careful.!

 

[hungabunga]

Hmmmm I am a bit confused now, in the other thread peeps are disabling the egr by blocking it so are prob getting a similar reading to 440. I like to be safe so I will remove the blockage but I would love more detailed info on why and I am sure most other peeps who have blocked the egr would also like to know.

Thanks

Sully

 

[glynnd]

I did question this explanation myself as it does not seem logical to me (ex motor vehicle techician 1987) however it possibly is plausible.
The reason for egr is to reduce nox emisssions and to cool the temperature of the exhaust gases and aid cooling of the catalyst.
Disabling the egr increases the temp of the exhaust gases thus incresing the temp in the turbo. Why the hell its doing this by introducing hot spent exhaust gases in to the fresh air charge in the cylinder(with the egr working) I personally cant see it. But I am sticking with mine turned down in vag com and the egr connected. If you are hell bent on disconnecting the egr try inserting a one way valve in the vac line to the egr. Make sure it fitted so it cant suck the egr valve open but can release back the other way, I know there is probably no air to release back but i fitted a bleed valve in mine and the light had not come on after 50 miles!