egr restrictor plate

[jonnypym123]

Being a curious man I purchased one of these and fitted it yesterday to my 3.0tdi, it restricts the flow of EGR gases, I know if it had been a plane blanking EML would have likely come on and that would be an MOT fail but with the restrictor all is good, Initial response is it seems to have a better pick up, I will test the economy of it tomorrow, amazing the lengths they go to for emissions at the sacrifice of your engine

https://www.ebay.co.uk/itm/EGR-valve....c100005.m1851

[Johnmed]

I’m relatively new to TDi powerplants, what if any is the advantage of these?

[jonnypym123]

It'll reduce exhaust gases being fed from the exhaust into the engine, the engine is fed its own waste to reduce emissions in normal egr operation, worth having a read around this madness. I didn't want a full egr blank as eml light would come on and thats an mot fail, will see what its like on ecomony today

[Johnmed]

Cheers Johnny. I was aware of the very basics of its function, but unsure of its effects on fuel economy. I’ll be interested too in what differences you see.

[jonnypym123]

Hey John, I drove to work today 26 mile It looks like it has no effect on economy which I was surprised, 40.5mpg for that trip which is the usual I normally get, I'm sure it must be better for the engine though less inhaling all that muck from the exhaust

[Johnmed]

Thanks for the update John.

How do people get these MPG figures? I’m a former hypermiler, in my A2 I got 60mpg around town and at 60mph 70mpg. Similarly in the wife’s 2015 Honda I get the same mpg as I did in the 3 cyl TDi.

My A8 used to get around 35mpg on a run to SW France, now it gets 33mpg, I put this down to wider tyres and bigger and heavier wheels. To get in the 40s I have to drive on the motorway at 56mph.

[snapdragon]

TBH, if less EGR gas is entering the intake than is specified (demanded) by the ECU, you will get an 001025 - EGR System P0401 - 002 - Insufficient Flow code. It is measured by the drop in the the airflow meter reading that happens when the EGR allows unmetered exhaust gas into the intake and corroborated by the O2 sensor in the pre-catalyst on 06-on models which looks for a small enrichment.
This is continually monitored by the ECU and the EGR valve position modulated to keep it within tolerance. I suspect the restriction is not adequate to reduce it enough to trigger.

You should get better economy if anything and cleaner intake, but it may be noisier coming off the overrun as the EGR's richer mixture makes for a quieter combustion.

[jonnypym123]

Hey mate, yes the manifold muck concerned me , its like feeding the engine its own poop, I am temped as well to clean the intake manifold but It looks very mess and the Mrs would go off it! I might ask local garage how much it would be to clean

Originally Posted by snapdragon

TBH, if less EGR gas is entering the intake than is specified (demanded) by the ECU, you will get an 001025 - EGR System P0401 - 002 - Insufficient Flow code. It is measured by the drop in the the airflow meter reading that happens when the EGR allows unmetered exhaust gas into the intake and corroborated by the O2 sensor in the pre-catalyst on 06-on models which looks for a small enrichment.
This is continually monitored by the ECU and the EGR valve position modulated to keep it within tolerance. I suspect the restriction is not adequate to reduce it enough to trigger.

You should get better economy if anything and cleaner intake, but it may be noisier coming off the overrun as the EGR's richer mixture makes for a quieter combustion.