Egr Valve

[isk]

I would like to hear from someone who has succesfully shut the infamous EGR valve using Vag-com, just to describe the procedure in detail (on non-PD 1.9tdi).

I only want to do it because apparently it stops gunk clogging up the inlet manifold, but are there any drawbacks? If not what does that valve do in the first place?

 

Igor

[charles]

There are serious disadvantages (petrol engines):

- to high combusion chamber temperature - detoning

- high NOx emissions -

- loss of fuel efficiency

[isk]

thanks Charles, do you know if the same would apply to a tdi engine?

[johnb80]

For a really good explanation have a look at the Ford Scorpio web site. There have been loads of problems with EGR systems and many owners have disconnected them completely with no major problems. In brief the EGR is used when combustion temperatures go above a preset limit. Exhaust gas is fed back into the inlet manifold which replaces some of the air, this in turn makes the mixture go rich so the fueling is reduced by the engine management system. The net result is the same as if you had reduced throttle. The horror stories of melted pistons don't seem to have happened and indeed my 24v Cosworth with it's EGR defeated was quite happy in Germany at 140mph+ for some 2.5 hours. The problems we sufferred with EGR enabled were slight hesitation at constant speeds.

 

Regards - JB

[Guest SA Intruder]

Closing the EGR down (not fully) is a standard means of preventing hideous problems of inlet tract gumming on TDis.

 

There are various threads on the forum, including links and more detail.

 

I did it, and gained a little power, and a more responsive engine. Whether there will be long term benefits is open to experience.

 

There are no drawbacks, apart from a slight rise in NOX emissions.

[Guest nimrod]

OT reply.

was up your neck of the woods today SA, saw a couple of black Alhambra's with GB badges stuck on the rear! could it have been you? and an antisocially driven 130 TDI Galaxy going north on the M6, but thats another topic!

[Guest SA Intruder]

Not me on the M6 - I was in Croston and area today if you saw something.

 

I have the GB reg. plates

 

Was there a really ugly sod driving - could have been me!!!!

[Guest nimrod]

I was in Wigan on the A49, now you come to mention it the guy was an ugly b##gger, definately a local <_<

its been a while 12yrs+ since I last drove round that way, and I'd forgotten how green it was! in comparison to when I drive south through Luton, Stevenage etc its so grey and depressing :(

 

no, not you different prefrix on plate

[Guest SA Intruder]

Then there's French speed limits! Bit of dust on dash....

 

And Cruise control (disengage only at peage and destination!!!)

 

Sorry isk, I didn't intend to hijack your thread - forgive me.

[isk]

Thank you all guys for your input - however relevant...

Unfortunately for me the kind soul with a vag-com thingy could not do a thing on my motor! The manual from Ross-tech said it would not work with 1995-2000 Sharans due to some bugs in manufacturers' software, so this probably explains it not working with my 1997 Alhambra 1.9 90bhp AHU tdi. I felt relief that I hadn't splashed out on OBD II cable + software etc, but still very disappointed with inability to do anything - so the inlet manifold will just keep gumming up...

I wander if any of you folks have had any success with early models tdi Shalaxys regarding vag-com ?

[Dally]

SA

 

Like the picture of your Alhambra. Must say I've failed to be impressed in the past by the Alhambra's front end but the angle you've caught it at does it some justice!

Looks good!