2000 ITR

Recently, I had a header (Comptech TIG 4-2-1) and custom exhaust installed (2.5' mandrel bent header back, with a high flow cat)

My check engine light has come on. Any ideas? I am planning to convert the car to OBD1 from ODB2 soon, however, I think the check engine light has come on do to the high flow cat and the second o2 sensor. Increase exhaust flow, the ECU thinks air/fuel is not correct???

I had a Spoon N1 installed for 7 months, ever threw a code... the N1 was only axle back...

Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RaVAGE00 &raquo;</TD></TR><TR><TD CLASS="quote">

My check engine light has come on. Any ideas? </TD></TR></TABLE>
What code does it have stored?

 

more than likely is your o2 sen. on the cat that is throwing out a cel.

 

It throws a CEL 67.... what the heck is that? Can I harm the engine in any way?

 

That is a Cat Converter Efficiency code. Aftermarket converters are very prone to these problems on OBD11 cars. Will not affect performance though, so not to worry. If you go OBD1, rear O2 sensor is no longer needed. Thats all the rear one does is tell on the converter (tattle-tail) if its not working "as designed".....3gdude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 3gdude &raquo;</TD></TR><TR><TD CLASS="quote">That is a Cat Converter Efficiency code. Aftermarket converters are very prone to these problems on OBD11 cars. Will not affect performance though, so not to worry. If you go OBD1, rear O2 sensor is no longer needed. Thats all the rear one does is tell on the converter (tattle-tail) if its not working "as designed".....3gdude</TD></TR></TABLE>

thanks thats what I thought... I am converting to ODB1 soon (Hondata P28 and s200) so this check engine light issue will disappear once and for all... strange thing is, a friend with a ITR, which is also ODB2, installed a similar exhaust setup, however, he is using a dynoflow high output cat.... he has yet to thow a CEL 67???? Doesnt that seem strange?

 

two things.

1.) never touch the sensor surface...this will cause it to fail much sooner.
2.) you need to reset your computer (unplug battery for 5 minutes) after the install as well

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tweakmeister &raquo;</TD></TR><TR><TD CLASS="quote">two things.

1.) never touch the sensor surface...this will cause it to fail much sooner.
2.) you need to reset your computer (unplug battery for 5 minutes) after the install as well</TD></TR></TABLE>

1. I did not install the custom exhaust, however, I will contact the exhaust shop today to verify that they in-fact, did not touch the o2 sensor surface.
2. I have reset the ECU twice and CEL 67 keeps occuring.

Also, I was told that the issue may be caused because the BRULLEN high flow cat installed in my car may be of a stage 2 design, however, the stock cat is of a stage 3 design....

 

I contacted the exhaust shop and this is what they said...

It turns out the Brullen high flow cat is a 3 stage design, however, it only has a 100 cells. Apparently, other high flow cats, such as dynoflow, carsound cats have 400 cells... typically these other cats will not cause a CEL 67, however, the Brullen does....

Anyhow, I will be converting to ODB1 soon, so this becomes a total non- issue, however, I currently see no detrament to the cars performance... I just want to make sure I am not harming the engine and/or the new cat.