Help -- Check Engine Light
Joined: Dec 2000
Posts: 4,307
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From: Ogden
Originally posted by Shamu
Yup -- I can confirm there are 2 sensors, and the service manual confirms that the CEL is a signal for faulty emmissions.
Yup -- I can confirm there are 2 sensors, and the service manual confirms that the CEL is a signal for faulty emmissions.
Joined: Dec 2000
Posts: 4,307
Likes: 13
From: Ogden
If you'ld like to pull down your own codes as I do...pick up a book on OBD-II from Amazon and some software from http://www.obd-2.com/, provided you have a laptop.
Utah
Utah
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Joined: May 2001
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From: Bellevue, WA
I am thinking the O2 sensor mounted in the catalytic converter is fouled. More than likely it recieved a whole bunch of punishment when it was mounted in the test pipe. Replace and try again. 
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From: Vancouver
Originally posted by Utah S2K
OBD-II uses hundreds of codes some standard and some specific to this car, and yes their mostly related to emissions but many....many codes have absolutley nothing to due with O2 sensing. For instance it is easy to pop a code if you sit in your driveway and rev up your engine to hear what your new exhaust sounds like (a false secondary air pump code induction). You can post a DTC P0411 at will....many mechanics dealers have little or no experience with this car. So I'll ask a very simple question one more time.......what DTC Codes were set???
OBD-II uses hundreds of codes some standard and some specific to this car, and yes their mostly related to emissions but many....many codes have absolutley nothing to due with O2 sensing. For instance it is easy to pop a code if you sit in your driveway and rev up your engine to hear what your new exhaust sounds like (a false secondary air pump code induction). You can post a DTC P0411 at will....many mechanics dealers have little or no experience with this car. So I'll ask a very simple question one more time.......what DTC Codes were set???
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Joined: Oct 2000
Posts: 1,057
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From: Fairfax
I've had Mugen ECU and BYS straight pipe for a bit and even ran that when I was at the track.
I've experienced CEL when the ECU was replaced with stock as Shamu. But fortunately upon reset with original CAT back on my car behaved normal without throwing the trouble code again.
I think I am with jerrypeterson with this one.
Your most logical step in tackling this problem would be by starting with replacing the possibly fouled Oxygen sensor. I am replacing mine because of the age(57,000miles) with the new one and although in ain't cheap($180 around), I am sure you can afford to do this Shamu, right?
If the dealer can spot you as warranty work, that would even be awesome.
So before pondering with other option, please do try replacing the oxygen sensor.
One interesting find from my experience is that, upon CEL caused by minor problem such as secondary air or emission problem such as oxygen sensor because of the catless operation, the car would run like crap initially for few days but it would gradually stabilizes the problem itself and car would run normally eventually even going into vtec. I cannot scientifically verify this but I am only telling this out of my experience.
Engine may be jerky or hesitant at first but eventually ECU seems to cure or compensate that later to make it run normally.
I've experienced CEL when the ECU was replaced with stock as Shamu. But fortunately upon reset with original CAT back on my car behaved normal without throwing the trouble code again.
I think I am with jerrypeterson with this one.
Your most logical step in tackling this problem would be by starting with replacing the possibly fouled Oxygen sensor. I am replacing mine because of the age(57,000miles) with the new one and although in ain't cheap($180 around), I am sure you can afford to do this Shamu, right?
If the dealer can spot you as warranty work, that would even be awesome.
So before pondering with other option, please do try replacing the oxygen sensor.
One interesting find from my experience is that, upon CEL caused by minor problem such as secondary air or emission problem such as oxygen sensor because of the catless operation, the car would run like crap initially for few days but it would gradually stabilizes the problem itself and car would run normally eventually even going into vtec. I cannot scientifically verify this but I am only telling this out of my experience.
Engine may be jerky or hesitant at first but eventually ECU seems to cure or compensate that later to make it run normally.
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