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Originally Posted by C.Doner
When you start cold how does it run? Do you get a fast idle for a minute or so while it warms up? It should slow to normal within a few minutes. Does it run smooth then act roughly after it is warm? If so then you have a lean fuel condition. That would point to a vacuum leak. I would be sure all vacuum hoses are good before even looking at the Cat.
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Runs strong on start at higher rpm as it has a wur & its a air controlled idle. Runs first at 1200 to 1500 rpm will then will settle down to 750 in about 5 minutes. Car idles 750 to 600rpm (with AC) in drive
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It looks like previous years you were very close to a fail. One you were at the limit exactly on HC. That leads me to believe this issue has been going on for a while. You just noticed now because it got worse. Driving it that way would do the Cat in. It is possible your Cat has been on the way out for a while causing the high readings. It is also possible that driving the car with it not running well killed the Cat. If it is the latter you need to address both issues. If you get a new cat and it still runs funny it wont last long.
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2009 high NO fail was brought down alot by new oxygen senser. tempted just to get a new one to pass it & then address the other issues.
still the failing makes me eligible to get a new cat for free so maybe I should just do that too.
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It looks to me like you have a lean mixture. Low CO and high HC points to a lean fuel ratio.
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It was leaned in 2009 to pass smog & was left that way by advise of MB motors
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That metal hose is a heat riser. It should connect to the bottom of the air cleaner. It looks broken. That wont cause emission trouble. Its part of the warmup cycle and opens a valve on the air cleaner for fresh air I believe. See if you can find where it goes under the air cleaner. You can get a new riser easily from a hardware store. It looks like foil right. My old Nissan had its heat riser off for years. I really doubt that is your issue, but it could cause a fail for the visual inspection part of the smog test.
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Its not foil its a solid metal corrugated tubing of approx 1 inch diameter. There are 3 closed off opening on back of air cleaner so maybe it went in one of those. The hose is coming up from some thing underneath but I can't see where it originates. Possibl part of car before it was converted to US? I
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Last edited by CamelotShadow; 06-22-2013 at 06:38 PM.
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