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Discussion Starter · #1 ·
I took my 1987 GT in for yearly inspection and it failed the Idle emissions test with a reading of 334 HC (ppm) It was fine in the high speed test. Can someone tell me what to check so I don't have to take my car to the dealer and pay them to change spark plugs or what ever is needed. I'm afraid I don't know alot about how the emissions system works.
 

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does your car have cats? i am afraid mine wont pass either because the guy that had it before me put an O/R H-pipe. If the HC's were that high, then i would assume you have no cats or the ones you do have are no good anymore. iits just measureing all the bad crap your car is putting into the air.
 
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if you havent changed your oil lately that could do it or you may need cats if you already have them drive around for like 45 min before your test and leave the car running when you get there to super heat your cats
 

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Discussion Starter · #4 ·
What are cats?

Sorry, What are cats other than those furry things that leave tracks on my car every time I wash it, I don't know what Cats are so I assume that I do not have them. The car to my knowledge is completly stock.
 

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1965 Mustang coupe
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Sorry, What are cats other than those furry things that leave tracks on my car every time I wash it, I don't know what Cats are so I assume that I do not have them. The car to my knowledge is completly stock.
Catalytic converters. Required on every car since 1976.
 

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Yup, catalytic converters are what they are. They convert the exhaust gases over from CO to CO2 and H2O. Essentially, they burn off all the excess gases in your exhaust.
 

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I'd say you definetly need some New cats and maybe back your timing off
 
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