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Old 03-14-2002, 01:53 PM   #1
Sergeant_V
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Thumbs up WRX Cat inefficient CEL Fix (Mil Eliminator)

Recently I installed the Mil Eliminator available from Pony Express Performance. I finally had enough of the P0420 Catalyst system efficiency below threshold CEL I was looking at every day due to my off-road set-up (catless Scoobysport and Vishnu Uppipe).

Installation was pretty straightforward. I disconnected the rear O2 sensor leads from the harness and unclipped it from the two frame mounting points. I removed the sensor from the exhaust system, 'cause I didn't want to try soldering upside down Once off of the car wiring in the Mil Eliminator was pretty simple. The instructions are easy to follow. The vendor recommends soldering or using butt connectors. I used a bit of heat shrink tubing at the four points where I spliced in the Mil Eliminator about two inches from the connector. After wrapping the area real well with electrical tape (I intend to improve that later) I re-installed the O2 sensor.

It's been on the car now for a little over a week and a half. I've driven 560 Cat inefficient CEL free miles. Without the MilEliminator I would expect the CEL to pop on within the first 30 miles of clearing the code. I'm pretty convinced that particular CEL is something I won't be looking at in my car again.

Dan at Pony Express Performance was extremely helpful and answered all of my questions prior to ordering and installing the device. You can contact him through the website.

If you decide to order the Mil Eliminator it will run you $20.95 including standard shipping. Is it worth it? That's entirely up to you as the consumer. It certainly is to me. I have no idea nor do I care how inexpensive the components are. I paid for a proven product from a vendor that offered me a guarantee and has the product ready to go.

The item you want is the PEP-SMIL. Be sure to indicate in the notes section that you are ordering for a WRX otherwise you might receive a set of instructions for a Mustang
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Old 03-14-2002, 05:27 PM   #2
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Default Are you cat-free turbo back?

Did you remove both turbo back cats or just the one in the downpipe?

I ordered one of these as well and I have both a cat-free downpipe and a stromung third-cat eliminator to install (for track time ) and I want to insure it won't throw CELs.

Thanks
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Old 03-14-2002, 05:29 PM   #3
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My off road set-up is entirely cat free.
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Old 03-14-2002, 05:35 PM   #4
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Default Thanks

Thanks for the reply.
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Old 03-19-2002, 02:37 PM   #5
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Default Yo

I read your post this weekend and ordered the MIL yesterday which means it should ship out today. I currently have the Vishnu Up-Pipe and will be running the Stromung catless dp so I have a feeling that it will cause a CEl due to the removal of the 1st 2x Cats. I hope it's all PNP and the MIL will work if I do indeed get a CEL. I'd go catless but I still wanna pass emissions w/out removing my exhaust every year.
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Old 03-19-2002, 04:43 PM   #6
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Default One more Q...

Sergeant_V - are you having any problems with unburnt fuel in your exhaust (i.e. fireballs, etc) with this setup?

Thanks
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Old 03-19-2002, 04:49 PM   #7
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No. I've got the stock recirculating BOV. If I was venting to the atmosphere I'd expect to see some fireball action.
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Old 03-19-2002, 04:51 PM   #8
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chuglobal, you will not get a P0420 CEL with the Mil Eliminator installed.

Cheers,
V
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Old 03-22-2002, 11:55 AM   #9
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Default Yo

I got the MIL in the mail yesterday ... very quick service = very nice. My Stromung catless dp should be here TODAY unless UPS messes w/ me. I'll put the dp on and see if it causes a CEL due to lack of Cats. If it does then I'll use the MIL ... I'll keep everyone updated.
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Old 03-22-2002, 12:41 PM   #10
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chuglobal, you should be ok if your still running the 3rd cat.

BUT, you have done an uppipe too, soooo, that might make a difference. ive read that that first cat (uppipe) could help if it stays in.
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Old 03-25-2002, 01:21 PM   #11
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Default Humm ...

Well I got the CEL yesterday once and reset the ECU and got it again today driving to work. Well I'm gonna get to code pulled this afternoon and hopefully it's the 0420 because I already have the MIL fix ready to go. The MIL fix better work ... hehe. I have the Vishnu Up-Pipe, Stromung catless dp, factory 3rd Cat and mid pipe, and Tanabe SRM Cat back.
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Old 03-27-2002, 12:06 AM   #12
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Application:
1997 Ford Probe
1996+ OBD-II Passenger Cars
1996+ OBD-II SUV's
1996+ OBD-II Trucks

Is this the one to purchase?
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Old 03-30-2002, 12:18 PM   #13
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The one you want is PEP-SMIL. It's just a single Mil Eliminator.
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Old 04-13-2002, 01:07 AM   #14
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Does this cut all readings to the computer or does it just mask them and hide the CEL's certain Ohm reading from the computer? I worry that if it hides the signal completely and just sends an Ohm that is a set Ohm like 5 or whatever the setting for a downpipe with a cat would be that it could cause problems because the computer uses the front O2 and back O2 in conjunction with each other and if you are hiding the real readings from the computer you could theoretically cause damage. Also is this okay to use with the Turbo XS Unichip?
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Old 04-13-2002, 02:16 PM   #15
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>Also is this okay to use with the Turbo XS Unichip?

Would love to know this myself also.
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Old 04-14-2002, 09:47 AM   #16
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Quote:
Does this cut all readings to the computer or does it just mask them and hide the CEL's certain Ohm reading from the computer?
The only function of the MIL Eliminator is to fool the ECU, CPU or PCM into thinking the cats are still there by filtering the voltage and keeping it above the acceptable threshold to prevent a CEL from triggering. With MIL Eliminators (malfunction indicator light)eliminators, the ECU thinks the cats are still there and unctioning. It does not lean out the A/F ratio, as the rear o2 sensor is only an emissions monitor.
Quote:
Also is this okay to use with the Turbo XS Unichip?
Yup. Dan Smith at info@mileliminators.com can provide you much more technically satisfying answers. Drop him a note if my short responses didn't do the trick.

-Abel
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Old 04-15-2002, 08:09 AM   #17
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Just to clarify the issue of removing which cat causes the PO420. The PO420 is caused by the removal of the downpipe (aka 2nd cat), as the Lambda sensors are only across this cat.

As an aside, a number of guys this side of the pond, me included, have had other CELs soon after removing the uppipe or rear cats leaving the downpipe cat in place. These have turned out to be caused by other issues highlighted by the fact that you tend to rev the engine harder. The main cause are the cam and crank sensors.

Duncan
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Old 04-15-2002, 09:16 AM   #18
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Duncan,

Which other CEL code are you seeing? Since installing the gadget the only code I've encountered is P0546 "Exhaust gas temperature sensor circuit high input" due to the cooler temps in the uppipe.
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Old 05-08-2002, 08:23 AM   #19
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Quote:
Originally posted by Sergeant_V
Since installing the gadget the only code I've encountered is P0546 "Exhaust gas temperature sensor circuit high input" due to the cooler temps in the uppipe.
hey Serge... isnt the 0546 when the EGT get TOO HIGH? as opposed to "cooler" temps. i am getting the MIL Elim. this week, thanks again for the write up!!

Bob
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Old 05-09-2002, 08:28 AM   #20
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Talking

SergentV

Sorry for the delay in replying - I missed your question.

The CEL code that I got was for the cam position sensor (PO336), although others have had crank position sensor errors (PO341) as well.

Can't comment on the EGT situation although I have heard of some people having this problem.

Duncan
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Old 05-10-2002, 05:15 PM   #21
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Quote:
hey Serge... isnt the 0546 when the EGT get TOO HIGH? as opposed to "cooler" temps.
Westy, EGT sensor resistance is inversely proportional to EGT. High input means that the temperature in the uppipe is less than what the ECU is expecting. It took a few frantic searches after pulling that code before I understood what was going on.

Abel
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Old 05-18-2002, 01:13 PM   #22
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Sarge... what wires go to what? the instructions included (Ford) list different colors of wires. how did you hook it up? i have my car on jack stands right now!

thanks in advance
Bob
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Old 05-18-2002, 11:53 PM   #23
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Westy,

e-mail me your addresss. I'll send over the WRX specific instructions that I have.
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Old 05-20-2002, 09:46 AM   #24
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If you didnt get the WRX specific instructions and only got the ones for Ford...

WRX Blue is Ford black

WRX White is Ford Gray

WRX Black is Ford White (Leave these two black wires alone)


Last edited by westy66; 05-21-2002 at 09:35 AM.
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Old 05-20-2002, 03:12 PM   #25
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I tried that, but the document looks funny if it's pasted in because of the images. I'll see if I can get just the text into a post tonight.
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