C5 EGR valve

Post by **Sir Clive** » 09 Nov 2005, 11:07

I decided that the trusty C5 would be better off without . It's a bit like asking an athlete to breathe in their own farts while trying to run a race....bound to affect their performance

Being a 2 litre engine, the valve appears to be on the rear left hand side of the engine, easy to see but not so easy to remove and blank off. I decided just to pull off the vacuum pipe. The engine started and ran just fine, neither did any diagnostic lamps come on. Anyway, I've stuffed a ball up the vacuum pipe and reconnected it. Have I got more performance? Hard to say, it pulls like a train anyway. On balance, like my appendix, I can live quite happily without an EGR valve!

Rostami · Post by **Rostami** » 09 Nov 2005, 11:35

I dont know which is the engine that you have on your C5. On my Hdi, the EGR is only activated at low rotations, and is automatically cut-off at around 2700RPM.

I tried disconnecting it and being the engine a diesel one, with high torques at low RPMs, there is a slight difference. However on a petrol engine things are quite different, so maybe that is why you are not feeling anything. Anyway, it´s better to let the engine fart of to it´s own mouth than to other peoples faces

406 V6 · Post by **406 V6** » 09 Nov 2005, 12:19

I advise to disconnect the EGR, though i haven't done it yet on the C5.
On a regular visit to a trusty mechanic with the Frontera (2.2DTI), the admission was removed and boy, oh boy!, was that dirty!

The intakes were reduced by almost 1/3 in diameter, and the car had only 45.000kms on it!
Definitely, something on the to-do list for the C5, together with the cleaning of the intercooler.

Post by **Sir Clive** » 09 Nov 2005, 12:28

My engine is the 2 litre Hdi. The main reason I disconnected the EGR was to prevent the build up of muck in the inlet tract which these things seem to be very prone to causing.

fastandfurryous · Post by **fastandfurryous** » 09 Nov 2005, 14:45

They certainly are the cause of a lot of gumming up of the intake system. I once took a 1.9TD engine from a later 406 apart, and one of the inlet manifold branches was so blocked with crud I could barely get my finger through the remaining gap.

EGR is the spawn of satan, and is undoubtedly the cause of a great number of engines (and cars) being written off well before their time. Not exactly environmentally friendly then, is it!