kind of odd...
11-01-2004, 08:19 AM
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kind of odd...
Finally got my smog check done today. Passed everything, however, something caught my eyes.
The CO and NO were both well below the max allowed. However my HC at 15mph was at the max allowed. Max allowed HC at 15mph is 55, average is 9 and my measured was 55. At 25mph it was much better, max allowed is 39, average is 7 and my measured was 23.
What can cause my HC to be high?
Car is 2000 model with 43K miles. No engine or exhaust modifications.
Suggests welcome, comments...
The CO and NO were both well below the max allowed. However my HC at 15mph was at the max allowed. Max allowed HC at 15mph is 55, average is 9 and my measured was 55. At 25mph it was much better, max allowed is 39, average is 7 and my measured was 23.
What can cause my HC to be high?
Car is 2000 model with 43K miles. No engine or exhaust modifications.
Suggests welcome, comments...
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11-01-2004, 09:53 AM
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I think the same thing happened with my car the last time I smogged it. Everything was way below max except HC, which was right near the max. HC's come from unburned gas. The cat is supposed to turn the hydrocarbons into CO2 and water. Maybe you're running a little on the rich side, or the cat isn't completely doing the job?
11-01-2004, 09:56 AM
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Originally Posted by dubster99
I think the same thing happened with my car the last time I smogged it. Everything was way below max except HC, which was right near the max. HC's come from unburned gas. The cat is supposed to turn the hydrocarbons into CO2 and water. Maybe you're running a little on the rich side, or the cat isn't completely doing the job?
I made sure the car was nice and hot coming off the freeway but I had to wait about 30min before the actual testing began. When I got the car back the oil temp was below 200F so it wasn't fully warm. I hope it's not my cats, I have 4 of them and they are $$$$$.
Not sure why the car would run rich unless it went into warmup mode. But that's only suppose to happen on the first cold start of the day and for the first 10mins.
Might be time for another dyno run to get my O2 level checked :rick:
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11-01-2004, 10:02 AM
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Originally Posted by DakarM
Might be time for another dyno run to get my O2 level checked :rick:
You could do that, or you could check your plugs and see if they are dark and smell like fuel.
11-01-2004, 10:12 AM
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Originally Posted by dubster99
:rofl:
You could do that, or you could check your plugs and see if they are dark and smell like fuel.
You could do that, or you could check your plugs and see if they are dark and smell like fuel.
Yeah I'm going to check the plugs. After 4 or so years of autox, I'm sure it wouldn't hurt to replace them :happysad:
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11-01-2004, 10:13 AM
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Originally Posted by ED9man
yeah, plugs are a good place to start.
Check the oxygen sensor/sensors too.
Check the oxygen sensor/sensors too.
they should be fine, I'm not getting a CEL and the car only has 43K miles.
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11-01-2004, 10:23 AM
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Originally Posted by clickwir
4 cats? Dang.
Are they in parallel or series?
Are they in parallel or series?
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Originally Posted by WiLL
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