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AFschizoid
Novice
Feb 28, 2012, 6:57 PM
Post #1 of 11
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failed emissions test
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Hello, my name is Robert, and i have a question that i hope someone can answer.
I just bought a 1994 Mazda Protege SOHC, took it in for an emissions test in Arizona, and the CO% test came out fine but it failed the Hydrocarbons test, came out with values of loaded reading 236 PPM and idle reading 385 PPM when both are supposed to be 220 PPM or under. what is most likely the problem that is causing these readings?
Also, I don't know if this is related, but when the car is idling, quite often i will hear a click that sounds like it is coming from the rear passenger side, then the idle speed will drop drastically, another click, and it raises back up. It does this basically whenever the car is in neutral or the clutch is pressed in
(This post was edited by AFschizoid on Feb 28, 2012, 6:58 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 28, 2012, 7:12 PM
Post #2 of 11
(2090 views)
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Re: failed emissions test
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HC is unburned fuel. First change the oil and look for any type of misfire issue. Check the ignition and timing.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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AFschizoid
Novice
Feb 28, 2012, 7:15 PM
Post #3 of 11
(2086 views)
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Re: failed emissions test
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so the erratic idle, the dropping low, then raising back up, dropping, etc. could be causing the HC issues?
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 28, 2012, 7:17 PM
Post #4 of 11
(2074 views)
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Re: failed emissions test
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Anything that's not burning the fuel completely can cause that.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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AFschizoid
Novice
Feb 28, 2012, 7:19 PM
Post #5 of 11
(2065 views)
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Re: failed emissions test
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ok, thank you very much for your help, i'll let you know what happens after changing oil.
I'm much more a computer guy than a car guy lol
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dr.donut
User
Feb 29, 2012, 7:01 AM
Post #6 of 11
(2025 views)
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Re: failed emissions test
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I've read that most of the H C 's are taken care of by the catalytic converter, or the cat. is most promenent in that dept.
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AFschizoid
Novice
Mar 1, 2012, 7:43 AM
Post #8 of 11
(1991 views)
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Re: failed emissions test
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Well checked the oil, its good, did a TuneUp, found a hole in the air intake hose, so we need to pick that up today, then we'll see how it runs
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AFschizoid
Novice
Mar 1, 2012, 7:57 AM
Post #10 of 11
(1982 views)
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Re: failed emissions test
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Would it do it that much within a week? The Guy I bought it from had an oil change within the week that he owned it before I bought it
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 1, 2012, 10:25 AM
Post #11 of 11
(1978 views)
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Re: failed emissions test
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I guess you though we already knew that, huh?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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