EGR defeat for WG 2.7 CRD

[bodgie]

From my reading when the EGR opens the this will reduce the volume of air detected by the MAF which should reduce the voltage seen by the ECU.

The shunt is a voltage divider which is designed to fool the ECU into thinking the EGR valve is operating. If the shunt supplies a voltage lower than the ECU expects this may be sub-optimal as far as the ECU is concerned IMHO.

At the end I'm a fussy bugger and like to make sure all is as good as it can be, besudes it can't hurt to have a play.

Plus I've never really trusted those pesky Europenas

[fester]

Will be interested to see if the jeep voltage range and therefore required resistor is particularly different to the ML270.

[piper]

Originally Posted by bodgie

From my reading when the EGR opens the this will reduce the volume of air detected by the MAF which should reduce the voltage seen by the ECU.

The shunt is a voltage divider which is designed to fool the ECU into thinking the EGR valve is operating. If the shunt supplies a voltage lower than the ECU expects this may be sub-optimal as far as the ECU is concerned IMHO.

At the end I'm a fussy bugger and like to make sure all is as good as it can be, besudes it can't hurt to have a play.

Plus I've never really trusted those pesky Europenas

if you change the resistor you will possibly throw a code which will stay in history as egr related, you can easily check the shunt with a volt meter

[drover]

I managed to get to Jaycar and buy some bits, all $1.40 with plenty of spares if I stuff up. Had a quick look this evening while I repaired a flat L/H steer that the missus managed to get and I can see sore knuckles when I go for the cable run, might be able to get to it this weekend.

[bodgie]

I've added an extra 100 ohms and am much happier now. No CEL so far, but I haven't checked for codes so who knows.

Jason

[drover]

Well it's now 12 mths on, how's the shunt working for you blokes that did the mod ????

Mine hasn't missed a beat, I know it must be working as the valve is fully disconnected, my wiring job hasn't failed me either, though I have a spare unit made up ready to plug in just in case. Don't know if it was this mod but my economy has gone from 9.3 to 8.9/100 overall and my foot hasn't got any lighter. Been looking for a socket to make up a fancy shunt but no luck so far.

[fester]

Gotta say nothing to report. As in all is fine and have not noticed anything . Car feels the same, starts the same etc. Can't comment specifically on economy as I don't watch it that closely as car is not a daily driver and wit 32's speedo is out anyway. Manifold is still nice and clean though, I had intercooler hose off the other day.