Now, to be clear, I'm talking about the classic ORM i.e. unplugging the MAF sensor.

For 5 years I ran with the MAF sensor both connected and disconnected but mainly the latter. Comparing periods of both scenarios I can't really say that I noted any difference:

- no difference in power
- no difference in soot in the oil
- no difference in mpg

I'm now half way through the first oil change interval since switching to the GDE tune, which we know for sure disables the EGR, and the oil is still remarkably clean. With or without the ORM it would have been black as the ace of spades at this point.

I've been using the same oil throughout so cannot attribute this to a different additive pack unless this has changed over time which, I suppose, is a possibility.

I know I'm probably committing blasphemy given the ORM has been part of our religion since almost day 1 but given these observations I have to ask does the ORM actually achieve anything or is it just urban legend, good intentions and feelgood factor?

To be clear, I'm not questioning the need to disable the EGR, just whether the ORM actually achieves this goal.

Does anyone know where the ORM idea originated and was it a credible source? Is there actually any proof that it does keep the EGR closed?

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I have never tried it very long. I never noticed any more power. My wife and kids drive the jeep also so i did not want a CEL on all the time, so i got a GDE tune. I can say my oil is just starting to get cleaner after 3 oil changes since the GDE tune. But this is that i found:

The ORM(Off Road Modification) is where the MAF is unplugged, with the MAF unplugged the EGR ceases to function. You will see a cleaner intake, better driveability, and better fuel economy with the EGR disabled via the ORM. This will cause a CEL(Check engine light) to be thrown constantly. This information applies to the 2005-2007 KJ CRD.

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

You are forgeting the part that the GDE tune does more than just turn off the egr. All of those other things are probably related to the other improvements of the GDE tune. I run veg oil in mine and I am sure it would not have worked for 80k miles if the EGR was still hook up.just my .02 cents.

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2006 Liberty CRD -- Spare tire replaced with Veg tank, semi filter for veg, FPHE, Electric common rail line heater, fill vegetable oil tank every 3 days. ORM, EHM comes out in front of the passenger rear tire. Wife has new job and 20 mile round trip to work. I borrow her Jeep a lot and live in South Florida.

The ORM does not completely disable EGR. Someone here had a scanner where they could still see it trying to work.

I never noticed any power or mpg difference, and I ran it since about the day it was discovered. Oil did stay a little cleaner though, and analysis backed that up.

The original ORM discovery thread does not seem to exist anymore. Doubt it got lost in forum moves/maintenance because older threads are still there. I forget who started it but it must have been in early/mid 2006. Originally titled The Official Kill The EGR Thread!!! or somesuch, it must have reached 10 pages. Later changed to The Official Off-road Mod Thread for CYA legal purposes. That's also the only reason I can think that the thread would be deleted.

All I could find was this thread showing the first serious brainstorming about disabling EGR, which led to the ORM, SEGR, etc.

viewtopic.php?f=5&t=4598

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

Here is a quick summery of the "story of the ORM" still buried in the archives of the forum.

viewtopic.php?p=276660#p276660

As CATCRD stated, TurboTim (the designer of the "SEGR") found a slight opening of the EGR valve using a scanner with the MAF disconnected. As I recall, it was approximately 10% or so (duty cycle) which is debatable whether it is open enough to have much if any EGR flow. Also as I recall, the FCV does not operate with the MAF disconnected, so with out any "vacuum" being "produced" in the manifold, very little if any EGR would be flowing through the intake.

You could just disconnect the EGR valve directly (which is essentially what the SEGR does). That would assure no EGR flow. This just gives you a different set of stored trouble code(s) (defective/inop. EGR valve).

We did the ORM back then, because the vehicles were in warranty, and it is infinitely easier to access the MAF connector then the EGR valve connector if you have to take the vehicle in for warranty service. As a matter of fact, I installed my SEGR at 36,020 miles. The vehicle now has just shy of 140,000 on it. I have never had any problems with the SEGR.

Let me know if there are more questions.........

BTW, I'm now a mechanic again

ORM made a difference in mine
more noticeable in power increase
smaller but measurable mileage increase (I think it was 0.3 mpg)


but that's also a function of how you drive - because the EGR turnon - was a function of how you drive, it's not constant.

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

The scanner dude was geordi (not Turbo Tim the Electronics Genius) who was evaluating an early GDE tune, not the ORM.
ORM works, and shuts off the EGR and keeps the flapper open, Old Navy is the guy who developed it.
If in doubt on any EGR reduction/elimination option, loosen up the two bolts that clamp the pipe to the EGR valve, slide in a strip of exhaust gasket material and tighten up the bolts, no more EGR flow.
I heard a rumor, but I can not confirm GDE read the tea leaves and did something regarding geordies findings.

As the Manufacturers of Common Rail Diesel engines have figured out, hot EGR going into the intake causes major problems. The latest versions pull the exhaust down stream from the DPF and cool the exhaust down before it is introduced into the turbo inlet.
The SCR that uses Urea (basically piss with out the salt and minerals) greatly reduces the NOX to the point where no to little EGR is needed to comply with the EPA regulation. I an waiting for someone to sell a Reverse Osmosis filter system on eBay so truckers can recycle their coffee into DEF.
Soon as 2014, even some of the gassers will be fitted with SCRs and need urea to run. Run out of the Processed Purified Synthetic Piss (Urea), and the car runs in limp mode.
I wonder how many of our Elected Officials and their Contributors are invested in SCR manufacturers?

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle