My EGR-disable results

[Mrcloc]

I disabled my EGR valve by unplugging the vacuum line and plugging it. I've driven with it on and off for long periods for quite some time now.

With it off, it seems the car feels a bit more responsive and slightly lighter on fuel when start stop around town. When on the highway the car feels more responsive (ever so slightly) and is slightly lighter on fuel with the EGR on.

With the EGR off you can hear what sounds like the pressure converter buzzing as pressure is lost when you switch off the engine. EGR back on and everything sounds fine.

I would say that the car is designed to work with the EGR, so leave it on. The difference isn't enough. If you want it off, remove the DPF, physically blank the EGR on the manifold and turn it off in software.

 

[131GAV]

Thanks for the share man....

 

[S1NGH 911]

Difference isn't enough, that's way off......

The EGR reuses exhaust gasses, in essence the car is digesting its own waste to save the environment.........

The pressure converter will hold up just fine with the vacuum line plugged :thumbs:


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[netercol]

as far as im concerned the egr mod is not about performance, its about keeping exhaust gas and the carbon and gunk out of your inlet manifold and engine..

 

[ChefDJ]

as far as im concerned the egr mod is not about performance, its about keeping exhaust gas and the carbon and gunk out of your inlet manifold and engine..

+1

And keeping the environment clean, which in SA is pretty much impossible...

 

[Andy1GP]

Thanks for the feedback though. It's nice that someone actually did the numbers and looked for results. After having done a couple (the last of which was an X3 2.0d) The owner commented on the car being more responsive all round.

I haven't checked what the EGR on it's own does for economy. Nice to know though so thank you.

What did you decide to go with?

 

[stiaan]

Is this something I can DIY? I've been on google quite a lot to see if I can do it myself, but they only show cars with different engines than mine?
Mine is pre-LCI N47 2008 model

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[Andy1GP]

Is this something I can DIY? I've been on google quite a lot to see if I can do it myself, but they only show cars with different engines than mine?
Mine is pre-LCI N47 2008 model

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Very Very easy. I can talk you through it on the phone, or if you're not far you can come over and I can help you with it.

*Edit

I see you are in gansbaai, so the phone it'll have to be

 

[DieselFan]

Don't listen to andy he'll leaving you hanging on whatsapp for 20 mins in between instructions :tease: .

Just joking but they're all the same principle if you look at how it's done on an e46 you can do it on an e90. I suggest taking off your boost pipe that goes to the egr and shine a torch in there and see if it needs to be cleaned. If its dirty whip it off and clean it before blocking it. It's very easy to do. Good luck.

 

[Mrcloc]

as far as im concerned the egr mod is not about performance, its about keeping exhaust gas and the carbon and gunk out of your inlet manifold and engine..

Exactly. But it's better to disable it with software and blank it (IMO). The car feels better on the open road with the EGR on (no software mods). And I get significantly better fuel consumption with EGR on. Normal driving around town it doesn't make much difference.

My EGR and intake are spotless and the car's done 102 000 km. The DPF does a great job at keeping things clean.

To me it's just not worth plugging the vacuum line. But I will definitely do the EGR in software as soon as I'm able to. I don't think I'll do the blank, but I'll do my research before the time.

Stiaan, EGR "disable" is super easy. I just pulled out the vacuum line and screwed a screw into it. I propped it with some solid-core wire so that it doesn't dangle in the middle of nowhere. But the vacuum line on my car is only about 10 cm long, so I could just remove it altogether and put a cap on the pressure converter (it may be a plastic connection, so maybe plugging with a screw would be better if that is the case).

 

[DieselFan]

It really makes no difference if the EGR is closed in software or if you physically so it. All they do in software is change some values to 0000 subsequently shutting the valve permanently. The only benefit of this is removing an error from the egr.

How does your DPF keep your intake manifold clean? The DPF filters your exhaust gasses after the turbo and the egr let's in non filtered exhaust gasses from the exhaust manifold.

 

[Mrcloc]

It really makes no difference if the EGR is closed in software or if you physically so it. All they do in software is change some values to 0000 subsequently shutting the valve permanently. The only benefit of this is removing an error from the egr.

How does your DPF keep your intake manifold clean? The DPF filters your exhaust gasses after the turbo and the egr let's in non filtered exhaust gasses from the exhaust manifold.

Maybe the DPF doesn't do anything then ito cleaning.

If your valve is blocked the ECU thinks that there are exhaust gasses going into your intake so the car effectively runs leaner. With it off in software the ECU knows there are no exhaust gasses, so the mixture will be correct.

 

[DieselFan]

Possibly, this is kind of what I thought to. But the guy who wrote the egr out of my file told me I had my information wrong.

The way I understand it is I received an error after blocking the EGR and the car reads there is no EGR gas flow and reverts to a mapping with no EGR flow.
When they turn the EGR off in software they do not adjust fueling in anyway there is a map for the EGR for the EGR switch which they set the values to 0000 effectively turning the EGR off and the car runs a map for no EGR gas flow. Anyway that's my understanding.

Anyway if it doesn't read the egr is shut when blocked the car would over fuel slightly, not run leaner as it's assuming it has the additional air where it in fact doesnt. And even if it does it's miniscule as the EGR is only really open at idle and very low throttle.