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F***APiston 09-18-2018 03:13 AM

Decat no cel
 
did a decat (bhr midpipe) about a week and a half ago. I drove the car a few times throughout the week but never threw a cel. I am just surprised by this because every thing I read said no cat = cel. I'm totally okay with this but just seams unusual. Got me questioning if cel light doesn't work, bad wiring or lights on dash are not working but seems like all others work. Just curious if possible issues with the light it self and again totally okay with no cel from decat just more worried about the lights condition because I was expecting one. Thanks in advance.

NotAPreppie 09-18-2018 06:31 AM

It is unusual but it can also take quite a few drive cycles.

If it doesn't happen then you're lucky. If it does then you're average.

BigCajun 09-18-2018 06:42 AM

Yeah, it's weird.
Sometimes I'll go weeks without one, sometimes it's every few days.
Pops up a lot on extended road trips.

UnknownJinX 09-18-2018 10:42 AM

The CEL turns on when you turn the ignition to the ON position so you will know if it's working.

I know some mid-pipes for other cars have a "bung" you can adjust to make the CEL go away. You have to keep messing around with it. Sometimes you get the CEL quickly, sometimes you never get, other times it shows up after a couple of hundred miles like it did for my friend.

furansu 09-18-2018 11:50 AM

Mine appeared within 50 miles for the catalyst. The smell is awful and seems to creep into the car when the windows are down (even at speed), despite not feeling any air leaks around the flanges of the manifold and midpipe. Going to source an aftermarket metal substrate cat that will hopefully cope with the heat.

04Green 09-18-2018 11:57 AM

Moving the sensor out of path, with a long bung, or a spacer, will fool that sensor. But, car will stink. I did the metal cat as a part of a Turbo ES midpipe. Exhaust was too freaking loud, so the back is pure Racing Beat.

UnknownJinX 09-18-2018 11:57 AM


Originally Posted by furansu (Post 4870458)
Mine appeared within 50 miles for the catalyst. The smell is awful and seems to creep into the car when the windows are down (even at speed), despite not feeling any air leaks around the flanges of the manifold and midpipe. Going to source an aftermarket metal substrate cat that will hopefully cope with the heat.

Yep, even piston cars with a decat smell awful, let alone a rotary.

I think the only track-proven option at this point is from HJS, which is quite expensive. Everything else is a bit of a tossup. The general rule is that if the cat's cheaper than the OEM, it won't last.

F***APiston 09-18-2018 12:18 PM

Okay so might just take a while to come on makes sense. But when I turn the key to the on position as unknownJinx was saying all other lights come on but no cel. So I'm assuming that it's not working any tips on where to start

UnknownJinX 09-18-2018 01:07 PM

Assuming everything else in the cluster works, the bulb could have burnt out. Not very common, but it could happen.

I'd double check the fuses(likely not the cause, but doesn't hurt to check), and then I'd take the cluster out. From there, you could do another check by applying 9V to the pins that power the CEL(check the wiring diagram). If the light doesn't come on, you either have to solder on another LED bulb or replace the whole thing.

F***APiston 09-18-2018 02:04 PM

Yes everything else on cluster works that's why it's weird but I will start taking it apart and checking things

NotAPreppie 09-18-2018 02:12 PM

Usually using a spacer or anti-fouler will stop the P0420 at the cost of a P0139 because the ECU tests for that.


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