could you guys tell me whats wrong i failed on idle, here's all my numbers

91 honda civic si 1.6L

at 2086 RPM
limit: reading: result:
HC ppm | 76 | 46 | PASS
CO % | 0.42 | 0.03 | PASS
NO ppm | 870 | 869 | PASS


at idle(963 RPM)
limit: reading: result:
HC ppm | 200 | 1513 | FAIL
CO % | 1.00 |3.46 | FAIL
NO ppm | n/a |n/a | n/a


Thanks
oh yah i have headers and intake(brand new 02 sensor was put on last summer)


Modified by tony at 4:30 AM 2/7/2004

 

bump

 

you said you have a header when i failed my test i took it to honda to have them try and figure out why and the first thing the guy told me to do is take off the DC header. i did and now i have a bar sticker, well i had to do alot more then just that but that brought it down so much it was crazy.


keith

 

at idle(963 RPM)
limit: reading: result:
HC ppm | 200 | 46 | FAIL
CO % | 1.00 |0.03 | FAIL
NO ppm | n/a |n/a | n/a

What's the reading? and what's the limit? Seems like you passed???

 

Since you failed on HC I would definetely look into tuning it up.

 

updated had wrong numbers were i failed

 

vacuum leak?

 

You are running too rich at idle. And the car is misfiring badly at idle. high CO = rich mixture. high HC's = misfire. Your rich condition is likely the cause of your misfire and resulting high HC's.