Blocking the EGR Valve

[togenshi]

EGR flow I think is measured between MAP and MAF sensors. Due to the turbo, the MAP should always be higher than MAF sensor. If EGR valve is open, this should boost the MAP reading higher than the MAF. This is due to the turbo able to spool more since the exhaust is recycled. That is the only way that the EGR flow codes can be triggered with the sensors available on the ZD30DDti CRD. MAP is the sensor on the intercooler.

The ECU relearn may reduce the ECU's sensitivity between MAP and MAF. Not saying it will stop it but if it was expect a lot of EGR flow before and now there isn't, the ECU will throw an error. If ECU isn't expecting much of a difference, it will be harder to throw the error.

The reason its variable is due to all the circumstances the car can do through. If you live higher than sea level, oxygen levels are going to be different and the expect variables will change. If it gets ridiculously cold, the oxygen is more dense and fuel mixture will need to be adjusted. Change exhaust? New intercooler? Different turbo?

These variables are held in the ECU as long as there is power. This is remembered for when you next switch on the engine so it can run at optimal settings.

Edit: I wouldn't know exactly. But if I was told by my boss that we had a checkbox to tick - "Identify when EGR is tampered as cheaply as possible" - I would do the above. IT person by trade. I just get into the heads of engineers on what they would do.

[stewc1986]

I've been skimming through a few posts and cant seem to find much info in TD42 egr's.
Apparently they are only from 2002 onwards?
Can anyone clear this up for me.

Cheers

[mudski]

I've been skimming through a few posts and cant seem to find much info in TD42 egr's.
Apparently they are only from 2002 onwards?
Can anyone clear this up for me.

Cheers

2004 mate. When the Td42ti (turbo intercooled model) was released.

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[stewc1986]

Cool thanks.
That's one less mod to do

[growler2058]

Here ya go mate.

Anyone got a pic of where the F@@@ i block the egr on a crd?? I cant find anything that looks like the pic above

[Hodge]

Anyone got a pic of where the F@@@ i block the egr on a crd?? I cant find anything that looks like the pic above

Here you go mate.
Circled in red. 2 x 12mm socketed bolts from memory... I took off my IC to get to it easier.

[Hodge]

Another photo....

[Hodge]

[growler2058]

Champion mate. Does it matter which side of the gasket the plate goes on? Engine side or pipe side?

[growler2058]

I've found a clear pic for future reference



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