I just put a free flow catalytic converter few days ago now just not that long ago my check engine light came on. Could that be from the catalytic converter?

 

check the code ASAP

 

does it also make a difference as to which way the cat should flow? (orientation) (in/out)

 

I'm not sure, but would guess YES.

 

what year accord do you have?? if you have a 96+ and the second 02 sensor is not hooked up then that could be the cause.

 

it's likely that the free flow cat you got, unless it was like a carsound, was just a resonator or a test pipe, in which case, you'll get a CEL unless you somehow fool the second O2 sensor (if you have an OBDII 96-97 Accord). This can be done with a simulator or otherwise. Seen a lot of posts about this lately. And yes, orientation of a true cat does matter I believe.

- Nathan

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92Lx &raquo;</TD></TR><TR><TD CLASS="quote">it's likely that the free flow cat you got, unless it was like a carsound, was just a resonator or a test pipe, in which case, you'll get a CEL unless you somehow fool the second O2 sensor (if you have an OBDII 96-97 Accord). This can be done with a simulator or otherwise. Seen a lot of posts about this lately. And yes, orientation of a true cat does matter I believe.

- Nathan</TD></TR></TABLE>

 

the cel is likely for "low-efficiency cat". mine car's been throwing it for the last 2 years, it doesnt really hurt anything from what i can tell, it's just annoying. install an o2 simulator to get rid of the cel's.

 

so are the carsounds throwing cel's. ill be replacing the cat very soon on a 98 lx LEv AND IF I CAN GET AWAY WITH A HIGH FLOW without throwing cel's ever, then im all for it.

 

my carsound isn't throwing any codes since it's been installed

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fluxion &raquo;</TD></TR><TR><TD CLASS="quote">the cel is likely for "low-efficiency cat". mine car's been throwing it for the last 2 years, it doesnt really hurt anything from what i can tell, it's just annoying. install an o2 simulator to get rid of the cel's.</TD></TR></TABLE>

it keep the car's from going into close loop operation, it basically give you bad mileage.
the 2 sensor monitor the oxygen level in the exhaust gas, without the converter, you just keeping the earth

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accordrider &raquo;</TD></TR><TR><TD CLASS="quote">my carsound isn't throwing any codes since it's been installed</TD></TR></TABLE>

OBD1 dude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2dark2bslow &raquo;</TD></TR><TR><TD CLASS="quote">so are the carsounds throwing cel's. ill be replacing the cat very soon on a 98 lx LEv AND IF I CAN GET AWAY WITH A HIGH FLOW without throwing cel's ever, then im all for it.</TD></TR></TABLE>

you properly dont want to get caught with a non-properly working cat converter(include rusted out cat, hollow out cat, free flow, test pipe and those non-carb eo'ed cat) in SoCal.

 

on an OBDII all you have to do is make is make second o2 sensor bung or buy one with one from carsound.

 

I had the same thing happen to me, the place that installed my high-flow cat just hooked the o2 sensor back up ... and I am not throwing any codes any more.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2+2=5 &raquo;</TD></TR><TR><TD CLASS="quote">

you properly dont want to get caught with a non-properly working cat converter(include rusted out cat, hollow out cat, free flow, test pipe and those non-carb eo'ed cat) in SoCal.

</TD></TR></TABLE>

i live in tx now, i should probably change location, we have no smog

 

I have a 01 V6. Well, I took it the shop and the shop said that it's from the cat. I went to a local muffler shop to install the cat and they didn't install it properly. I just fixed it up, so far the check engine light is off. Hopefully it'll stay off. Yea, I have the second O2 sensor plugged in properly. Thanks for all your replies.

 

so what would happen if the cat is flowing in the wrong direction?

 

i dont think direction matters. i could be wrong but when i did my carsound i didnt pick, could have just gotten lucky.

if you got a universal you can get a spark plug de-fouler and have a local muffler shop weld it on there as an o2 bung and screw the o2 sensor in just like stock.

i had a carsound, stock cat and a testpipe. i like the testpipe the best. makes it raspier, but you can feel a bit more push.

good luck.

 

yah if you obd2 then you need the bungs in there.. they are there for a reason.. have your muffler shop put in a bung should be like 10-15 bucks tops..

if worst comes to worst and you think you've done it all and still have CEL, after your RESET THE ECU.. then pick up an o2 simulator

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boonacka &raquo;</TD></TR><TR><TD CLASS="quote">so what would happen if the cat is flowing in the wrong direction?</TD></TR></TABLE>

then it's being restricted.

i know alot of resonator are directional as well as a bunch of grass pack are

 

That is exactly why my check engine light came on.

 

does your exhaust sound like almost bubbly.. kinda like you had a v8 with a really wild cam that doesnt like to idle?

 

Would a high flow cat help out alot?

 

I put a high flow cat and 2.25 stainless on my 92.I can feel a little more pull at higher rpms. In 2 and 3 gear is the biggest gain.