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EGR or Not
As stated in an earlier thread, I have a 2006 EGR-equipped engine. I installed the “Ugly Fix” in an effort to improve fuel economy, but mainly to try to reduce the negative results that the EGR system may have on the engine.
Then it came up that The Ugly Fix was not deactivating the EGR on some or all of our engines due to the altitude cutout feature may not be active on all installations.
So I ran the but yesterday with the code-reader installed. The only EGR tags I found were as follows (photo taken with bus shut off):
These items moved a bit as the bus was driven, with the EGR DPS moving from 0.6 to a lttle over 1.0.
Jon I think said if the EGR is active I would see boost Pressure nearing 50PSI. What we saw under heavy load was mainly pressures of 41-43PSI, with an occassional moment at 45.
So my questions are:
1 Do the boost pressures observed mean the EGR is active or not?
2 Can I tell for sure from the values of the 3 EGR items in photo if the EGR is functional?
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2 Replies
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With the engine off you can’t tell if the EGR is functioning or not with those readings. If you are building over 40 lbs of boost your EGR is still functioning. I think your reader will display the software level of the ECM. If it’s 3.XX every one I have seen has the high altitude EGR enabled with means the Ugly Fix will not work.
Ken
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John, I was able to plug my Nexus reader in the connector by my left knee under the dash, and a short trip up I-40 showed turbo boost pressures around 48 to 49 PSI at times. With the EGR not functioning the boost remains maxed out around 28 to 30 which corresponds to the dash gauge. The dash gauge will not reflect the higher boost of the EGR.
If yours continues to function Ken can provide help to either make the Ugly Fix work, or even eliminate the need for the Ugly Fix.
Just so you and others are aware, Using the Ugly Fix, or turning off the EGR function kicked up my mileage about 2 tenths of a MPG immediately. When I plugged the exhaust between the EGR cooler and the intake manifold I added another tenth of an MPG. The apparent savings of 5% is like getting a 5% discount on the cost of fuel. But wait, theres more………….after I did that my 100,000 mile engine started showing additional increases in mileage. On the four refillings prior to the testing I am now doing on the fuel additive my average mileage went from thr 5.9 at the start of all testing, to 6.2 after the EGR was shut off and the line plugged, to somewhere around 6.4 to 6.5 on the four refills before I started using the additive.
I spoke to some folks such as Ken and others and they were not surprised with the concensus being eliminating the EGR has cleaned up my intake air quality and the engine has been “cleaning” up the sooting brought about by the EGR. I see big differences in my oil color between changes with it being less black and more a dark golden color now.
Part of that might also be attributed to a change Ken made to my DDEC. Regardless of the reason Ken is the go to person for further information.
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