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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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Yes it is hi at start up. It has a warm up regulator & a air controlled idle valve. It does come down after a while. I'll ahve to double check but I do know its rpms in drive stiing still are about 550 600? hard to tell exactly.
I'd like to check vac hoses but not sure if I can. I did change all the soft rubber connections on anything I could get access to.
Could not get to 2 or so behind the foel distributor on pass rear side.
Afraid to pull them off after breaking the 50C red plastic nipples off the valve behind the wur.
Enrique onstalled a new one.
Used to be hard to start when hot.
Enrique installed a new ccumlator so now it starts warm after a few revs.
It does run lumpy after got starts???
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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.
It looks to me like you have a lean mixture. Low CO and high HC points to a lean fuel ratio.
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 a 1 in solid coiled tubing. Would not call it foil & there is no open connection under the air cleaner that I ca remember but could re check. Don't think I would miss that