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Re: Passed state inspection - but just barely,why? (archive)

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Posted by JPL on April 22, 2002 at 13:20:05:

In Reply to: Passed state inspection - but just barely,why?? posted by Doug on April 22, 2002 at 12:09:18:

I usually do a complete tune up before a state inspection (including valve adjust). Last test it failed (high hydrocarbons). It turned out to be a bad cap and rotor. They only had 30k on them but the contacts inside the cap were badly burned. I replaced them and the O2 sensor and passed easily. I also run a bottle of Techron completely through the week before. My mechanic said to use gas that has a high ethanol content (only for the test) as this reduces the hydrocarbons.

90 m3
black and tan

I had my car inspected this weekend and I got my sticker but the guy doing it said it wouldn't pass next year because of new testing equiptment they'll be required to use. He commented on the amount of exhaust he could smell, said it was a strong 'carbon-dioxide' odor. My numbers are as follow: HC-191 , CO%-0.41 , CO2%-10.6 , 02%-0.0 , Dilution%- 11.01 . What are the main (gereral) causes of that odor which is not all together a fuel smell? I replaced the Oxygen sensor about 8 months ago, Catalytic Convertor 14 months ago. Could too much sparkplug gap cause this? What about a dirty(needs to be cleaned) K&N airfilter? How about cap/rotor, plug wires? Fuel injectors? I know I need to synch my throttles and reset the AFM - will do that very soon, would that be the problem? I want it to pass nicely next year..thanks.

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