Help -- Check Engine Light
12-19-2001, 09:00 PM
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Help -- Check Engine Light
I used to run with the Spoon cat by-pass and the Check Engine Light (CEL) came on. I brought it to service and they checked the CEL code and it came back as defective cat due to unusually high/dirty exhaust. This makes sense given that I wasn't running with a cat, and the svc. advisor agreed.
However, I've switched back to my cat and for the first day the CEL was gone. However, after one day driving it came back!
I reset the ECU via the fuse method (check FAQs), and the CEL was gone again -- while idling. As soon as I put the car in gear and gave it gas, the CEL came back immediately!
Does anybody have any ideas as to what may be going on and a possible fix to this??
However, I've switched back to my cat and for the first day the CEL was gone. However, after one day driving it came back!
I reset the ECU via the fuse method (check FAQs), and the CEL was gone again -- while idling. As soon as I put the car in gear and gave it gas, the CEL came back immediately!Does anybody have any ideas as to what may be going on and a possible fix to this??
12-19-2001, 11:39 PM
#2
Is the post CAT O2 sensor the same part as the pre? Maybe the #2 sensor is pissed off (made to follow a CAT?) because there was no CAT in front of it for a while and it somehow fouled it. I don't know Rich, just a thought.
12-20-2001, 12:10 AM
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Check engine light, that is one of the biggest restrictions and controls when modifying the car ... I'm not surprised that it went a bit haywire, anyway it's probably quite hard to determine the problem if some good Honda mechanic isn't willing to sit down and help you out. On the other hand, I suggest a Spoon ECU while you're at it ... Since you're doing a Spoon spec setup, you will need it sooner or later. Just my opinion anyway, that is why I always keep my modifications to strictly nothing that will affect the factory ECU's reading, performance until I'm ready for an aftermarket one.
12-20-2001, 05:16 PM
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I have tried the Spoon ECU and I can't really justify the cost of it for the gains...btw, it also causes the CEL to turn on. 
I'm not sure of the sensor setup, RT. But I know there are 2. When the dealer re-installed the CAT, I wasn't there so I couldn't tell you...however, I do have an appt. for them to 'fix' it next Thursday...hopefully it won't cause an arm and a leg!
I'm not sure of the sensor setup, RT. But I know there are 2. When the dealer re-installed the CAT, I wasn't there so I couldn't tell you...however, I do have an appt. for them to 'fix' it next Thursday...hopefully it won't cause an arm and a leg!
12-20-2001, 06:31 PM
#6
Have a service technician pull down the specific code being set off the OBD-II (On Board Diagnosics). Hopefully this will lead to the root cause of your problem. If it is an O2 sensor issue this will readily be known.
Utah
Utah
12-20-2001, 06:46 PM
#7
Originally posted by Utah S2K
Have a service technician pull down the specific code being set off the OBD-II (On Board Diagnosics). Hopefully this will lead to the root cause of your problem. If it is an O2 sensor issue this will readily be known.
Utah
Have a service technician pull down the specific code being set off the OBD-II (On Board Diagnosics). Hopefully this will lead to the root cause of your problem. If it is an O2 sensor issue this will readily be known.
Utah
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12-21-2001, 01:04 PM
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Bob the code told them it was a bad CAT. The question is how does the OBD-II system monitor the condition of the CAT? O2 sensor delta? I don't know ............
RT,
Yes, the OBD II monitors O2 through the change in O2 content before and after the catalyst. No change, bad catalyst.
However, I only saw one o2 sensor on the exhaust system. Did I miss the other?
RT,
Yes, the OBD II monitors O2 through the change in O2 content before and after the catalyst. No change, bad catalyst.
However, I only saw one o2 sensor on the exhaust system. Did I miss the other?
12-21-2001, 01:35 PM
#9
Originally posted by busaboy
Bob the code told them it was a bad CAT. The question is how does the OBD-II system monitor the condition of the CAT? O2 sensor delta? I don't know ............
RT,
Yes, the OBD II monitors O2 through the change in O2 content before and after the catalyst. No change, bad catalyst.
However, I only saw one o2 sensor on the exhaust system. Did I miss the other?
Bob the code told them it was a bad CAT. The question is how does the OBD-II system monitor the condition of the CAT? O2 sensor delta? I don't know ............
RT,
Yes, the OBD II monitors O2 through the change in O2 content before and after the catalyst. No change, bad catalyst.
However, I only saw one o2 sensor on the exhaust system. Did I miss the other?
12-21-2001, 02:01 PM
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Originally posted by RT
I don't know about Shamu's but the stock system has two O2 sensors (one upstream and one downstream or the CAT).
I don't know about Shamu's but the stock system has two O2 sensors (one upstream and one downstream or the CAT).