Prelude failed a smog test; results posted
06-04-2009, 04:04 PM
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Prelude failed a smog test; results posted
So my damn car failed (FML). Here are the results:
At 15 mph: FAILED
%CO2 Meas = 14.8
%O2 Meas = .1
HC (PPM) MAX 58, AVE: 9, MEAS 59
CO (%) MAX: .52, AVE: .02, MEAS .06
NO (PPM) MAX 451, AVE 57, MEAS 925
At 25 mph i passed
%CO2 meas = 14.9
%O2 meas = .0
HC (PPM) MAX 42, AVE: 7, MEAS 42
CO (%) MAX: .50, AVE: .03, MEAS .04
NO (PPM) MAX 738, AVE 50, MEAS 602
Any thoughts on this?
Thanks in advance
At 15 mph: FAILED
%CO2 Meas = 14.8
%O2 Meas = .1
HC (PPM) MAX 58, AVE: 9, MEAS 59
CO (%) MAX: .52, AVE: .02, MEAS .06
NO (PPM) MAX 451, AVE 57, MEAS 925
At 25 mph i passed
%CO2 meas = 14.9
%O2 meas = .0
HC (PPM) MAX 42, AVE: 7, MEAS 42
CO (%) MAX: .50, AVE: .03, MEAS .04
NO (PPM) MAX 738, AVE 50, MEAS 602
Any thoughts on this?
Thanks in advance
06-09-2009, 04:27 PM
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06-09-2009, 09:35 PM
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Re: Prelude failed a smog test; results posted
There's a few options. From reading around here some would seem to suggest looking into either SMSP or Hytech cats; for something cheaper Magnaflow makes decent ones for under $100.
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06-09-2009, 09:53 PM
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Re: Prelude failed a smog test; results posted
06-10-2009, 12:04 PM
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06-13-2009, 04:36 PM
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Re: Prelude failed a smog test; results posted
this piece of junk failed AGAIN. After I cleaned out the EGR and replaced the Cat. This car has been a NIGHTMARE!
The No went from 925 to 717. HC went down as well.
The No went from 925 to 717. HC went down as well.
06-13-2009, 04:56 PM
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Re: Prelude failed a smog test; results posted
Haha when we tested my h22'd Accord in school, it went so high that the computer screen had to go up like 5 pages haha I think it hit like 14900. Thank god for OBD1 
06-14-2009, 03:57 PM
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Re: Prelude failed a smog test; results posted
Since you have high numbers on everything, I would check your timing: engine and ignition. Over advanced timing can cause readings over double the limit. I know this from experience, as mine was triple on everything - both driving and idle tests.
I had a blown ect sensor and the previous owner covered this problem up by plugging the ect harness into the rear rad switch. After fixing this problem I still had double the readings on everything. I delayed my timing back almost to the max, and put in colder range spark plugs - previous owner had 1 heat range too high for engine, then passed three times under the limits on everything.
I would have suspected the cat, but I knew it was new, and had less than 10,000 kms on it. Engine tune has a huge impact on your readings.
I had a blown ect sensor and the previous owner covered this problem up by plugging the ect harness into the rear rad switch. After fixing this problem I still had double the readings on everything. I delayed my timing back almost to the max, and put in colder range spark plugs - previous owner had 1 heat range too high for engine, then passed three times under the limits on everything.
I would have suspected the cat, but I knew it was new, and had less than 10,000 kms on it. Engine tune has a huge impact on your readings.
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