Thread: D4 2.7L EGR and associated junk removal

I'm not going to dob the person in (yet), but I've just heard on the grapevine that it appears one of our gurus has suggested/advised that there is an EGT sensor in the 2.7, (and possibly more in the 3.0/SD) that can be picked up by an OBDII compliant reader.

If that is so, and if the temperature can be picked up by GAP tool or even better RovaCom IQ (ideally in instrument mode?????), then my immediate concern of being able to identify EGT whilst towing my brick can be easily/readily resolved.

Anyone able to confirm or debunk? (ideally particularly reading in instrument mode - I'm waiting for delivery of my RovaCom).

I'm way out of my depth here, but if it is one of those "less accessible" sensors, not easily read, would it be possible to connect it to a stand alone gauge?

I can't find EGR temperature using the GAP tool on my D4 2.7.

As i am not a computer guru,i stand to be corrected?

Yes you can read EGT on the tools and the vehicles have EGT sensors. I never bother doing so with my IID. I just drive it.

Originally Posted by DazzaTD5

*From my poking with it, to me it seems, there actually is no flow sensor in the EGR assembly, the D4 (and later D3) work it out from the resistance on the EGR motor, as in not enough resistance (egr motor not connected to the egr valve) or too much resistance (due to it being fouled up).

my take on this was the measurement between the maf and map sensors being programmed to have preset parameters with egr on and egr off . When egr is stuck open ( or closed ) the ecu detects the wrong parameters and sets fault.

Originally Posted by gavinwibrow

I'm not going to dob the person in (yet), but I've just heard on the grapevine that it appears one of our gurus has suggested/advised that there is an EGT sensor in the 2.7, (and possibly more in the 3.0/SD) that can be picked up by an OBDII compliant reader.

If that is so, and if the temperature can be picked up by GAP tool or even better RovaCom IQ (ideally in instrument mode?????), then my immediate concern of being able to identify EGT whilst towing my brick can be easily/readily resolved.

Anyone able to confirm or debunk? (ideally particularly reading in instrument mode - I'm waiting for delivery of my RovaCom).

I'm way out of my depth here, but if it is one of those "less accessible" sensors, not easily read, would it be possible to connect it to a stand alone gauge?

The early tdv6 don't have the probe but I suspect the later ones with the probe were more to do with reference measurement for dpf which yours won't have (dpf ), either way the reading will be post turbo ( ie , a lot lower than ideal )
Does yours throw a fault for egr if one is disconnected ?
Just from seat of the pants it didn't feel as if yours had been remapped from when i had a drive but I could be wrong.

Originally Posted by discorevy

my take on this was the measurement between the maf and map sensors being programmed to have preset parameters with egr on and egr off . When egr is stuck open ( or closed ) the ecu detects the wrong parameters and sets fault.

This could well be the case.

Originally Posted by DazzaTD5

This could well be the case.

Which is why I’d have assumed anyone who blocks the EGR on the early models by using a plate has change the air/fuel ratio the engine receives when the EGR should be open.

Originally Posted by discorevy

The early tdv6 don't have the probe but I suspect the later ones with the probe were more to do with reference measurement for dpf which yours won't have (dpf ), either way the reading will be post turbo ( ie , a lot lower than ideal )
Does yours throw a fault for egr if one is disconnected ?
Just from seat of the pants it didn't feel as if yours had been remapped from when i had a drive but I could be wrong.

Yep the person who advised there should be an EGT probe also noted the reading would be post turbo and therefore lower.

I have been advised it has had the EGR delete remap only (BAS?).

Dazza disconnected the drivers side EGR electrics a few days ago and after a drive home I could detect no apparent impact on performance etc, but as yet my old fingers can't get to the other one to disconnect it to check out any changes that might arise.