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Old 21 Oct 2009, 12:53 pm
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Default 98 Civic failed Drive Clean Test

Took my car (98 Civic EX) in today and it failed.

at 40km/hr:
HC ppm -> Limit 75 -> Reading 24 -> PASS
CO% -> Limit 0.42 -> Reading 0.38 -> PASS
NO ppm -> Limit 576 -> Reading 787 -> FAIL

curb idle:
HC ppm -> Limit 150 -> Reading 15 -> PASS
CO% -> Limit 0.7-> Reading 0.05 -> PASS

RPM = 2752 / 753
Dilution = 14.25 / 13.14

- 216,500 kms
- oil changed regularly (every 5000kms)
- use regular gas. tank was 1/4 full.
- it was raining outside. about 12 degrees celsius today.
- prior to the test i had the oil changed. was told the air filter needs to be changed next time, should be ok to keep existing one for test
- changed primary o2 sensor three days ago. my check engine light was on for months. the error code was P0135 O2 Heater Circuit, Bank1, Sensor1. After replacing the part the car had no errors
- replaced spark plug cables several months ago which were causing an engine misfire
- did not drive much prior to test. not driven at all yesterday and only to test centre 5kms away today (mostly highway to get there).
- after oil change car was tested. did not need to wait.

Any suggestions on what could be the problem? Could it be EGR? If so, how do I test for that?
Is it worth paying another $35 to retest and hope it passes? perhaps taking it for a long drive beforehand?

Last edited by abfab; 21 Oct 2009 at 12:55 pm.
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