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LT1-LT4 Modifications
1993-97 Gen II Small Block V8

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Old 07-14-2011, 11:39 AM   #1
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Default Didn't pass smog, high hydrocarbons..??

Well my 94 didn't pass smog this mourning. The visual and functional check passed but the emissions didn't.
I was told it was letting out high Hydro carbons. The max you can have at 15mph is 58, I was at 148 and at 25mph (max is 34) I was at 61.
What can cause high hydrocarbons?
I took out my Longtubes and put in some smog legal pacesetters and a new catalytic converter. Could that be one of the causes?
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Old 07-14-2011, 01:26 PM   #2
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It can be from a mess of things. Easiest question to ask is did they test the car when it was at operating temperature?

Here's a list of crap:

http://www.smogtips.com/failed-high-hydrocarbons-HC.cfm
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Old 07-14-2011, 01:32 PM   #3
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No cat defiantly cause a problem
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Old 07-14-2011, 01:41 PM   #4
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What kind of catalytic converter is it?
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Old 07-14-2011, 03:02 PM   #5
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They told me I needed a new egr valve when my Formula failed. It turned out I just needed to take the old egr out and blow out the carbon from the valve and the back of the intake manifold.

http://shbox.com/1/4th_gen_EGR.html

I aced the test after that. Hope it helps
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Old 07-15-2011, 04:07 PM   #6
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Thanks for the help guys...I think this might get expensive just trying to figure out the problem. Can you also fail smog if you engine is running rough?
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Old 07-15-2011, 05:51 PM   #7
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if its not running proprerly, i would say yes, its sure isn't going to help
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Old 07-15-2011, 05:51 PM
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