MIL eliminators

[businessjeff]

You guys know about them? Pretty sure it was here that i learned about them and there was a link i got from here to a site that had them. I think they were like $5? I was asking on another forum and I got this link (http://www.o2simulator.com/)


any1 know what MIL eliminator site im talking about?

One person didnt even heard about MIL eliminators. How do they work exactly? Im getting a new exhaust put on and I dont want a CAT or the o2 sensor on it.

Thanks.

[branchedout]

if you search, you'll find plenty of information on here about them... you can buy them cheap on ebay, make them even cheaper with a trip to radio shack, or if you want to be lazy and want a quality product, PM excelcier, he makes serious ones for sale.

[LostRacer]

MILs are used to trick the ECU into thinking the your cat is operating correctly. There is a resistor inside unit that keeps the signal in a steady voltage range so as not to initiate the CEL. If you want to eliminate the O2 sensore you'll need to chip your system with a tune that will cancel it out.

[marinofan]

Everytime I read this I read it as mother-in-law eliminators.

[businessjeff]

So without that o2 how is my comp going to get a proper a/f ratio?
Can it still hold a tune using just one of the two?
Are there any vehicals that have only 1 o2 sensor, if so would you still be able to eliminate an o2 sensor then?

Thanks.

[LostRacer]

I can't speak for all vehicles. But pending on the size of the engine (the V6 Duratec for example) It has 2 O2 sensors and 2 Effenciency monitors(99/00) (01/02 only have one monitor) The MIL eliminators actually connect to the monitors. If yo want to get even more confused the 99/00 have the monitors after each pre-cats. 01/02's have the monitor in the y pipe.

I'm not sure how much this helps you, but hopefully gave you some info.

[businessjeff]

LoL thanks for the try but i dont think that clears anything up for me.

[B3NN3TT]

MIL eliminators aren't to be used on O2 sensors, because you're right - the engine NEEDS O2 sensors to set a proper A/F ratio.

MIL eliminators are only used on CAT MONITORS, which are technically O2 sensors, but don't monitor your A/F ratio; they only gauge the efficiency of your catalytic converter.

If you have an O2 sensor DOWNSTREAM from a cat, it will need a MIL eliminator when the cat is eliminated. The 99-00 Cougars have two such sensors that need to be jumped when installing headers. My 4-cylinder Saturn has one.

The upstream O2 sensors (the ones closest to the cylinder head) are the A/F monitors - those you do not mess with.

[businessjeff]

damn b3nnet... OWNED, thanks man. That totally makes sense now. So do o2 moniters and o2 sensor look alike physically? And is this kind of setup common? Meaning pretty much all 4 cyl will have 1 o2 sensor and 1 monitor on the cat?

What Im getting at is, is there a chance that the thing I want to eliminate off of my cat an o2 sensor after all? Or does that not even make sense?

Thanks.

[super_coug]

Well I have been searching for some for my 04 Jaguar 3.0 for a while i think that they should be the same as the ones excelcier makes, i'll pm him

[Honzo]

eliminating the efficiency monitor(s) in your exhaust shouldn't change the way your car runs. If i'm correct, they'll just pull a CEL if your cat gets clogged so your average joe takes it in to get serviced and needs to have a new CAT put in. If you pull the cat and put a test pipe in and headers, you need the MIL eliminator so your CEL doesn't stay on, or you will never know if your engine is having a problem. Its just to keep your CEL actually reporting REAL problems with your engine. O2 sensors in the intake should be left alone and should be replaced if they stop working because they are what cause your engine to actually run the way it should.

Someone correct me if i'm wrong on any of this :biggrin:

[B3NN3TT]

What Im getting at is, is there a chance that the thing I want to eliminate off of my cat an o2 sensor after all? Or does that not even make sense?

I think I see what you're asking. I believe both are oxygen sensors in the academic sense, since they both essentially do the same thing (i.e. measure exhaust gas contents). The ECU uses them in different ways though. Having the cat monitors in place allows the ECU to read the exhaust BEFORE the cat (with the main O2 sensor), and AFTER the cat (with the cat monitor), to check the difference between the two to calculate the catalyst efficiency. MIL eliminators basically make the cat monitors lie to the ECU and report clean exhaust, when it's really not at all.

Does that help?

And Honzo, the reason we use MIL eliminators is because driving around with a CEL WILL affect your performance. The engine pulls timing when a problem is detected, ESPECIALLY with the air/fuel ratio. Retarded timing = loss of power and loss of fuel economy.

[Honzo]

And Honzo, the reason we use MIL eliminators is because driving around with a CEL WILL affect your performance. The engine pulls timing when a problem is detected, ESPECIALLY with the air/fuel ratio. Retarded timing = loss of power and loss of fuel economy.
ah! thanks for the clarification! :thumbsup: