Volvo :: Failed Smog Check (Functional And Emissions) On 1990 240
Apr 22, 2013
I drive a 1990 240 with close to 300,000 miles on it. Haven’t had any troubles with it in the 1-2 years I’ve had it.
Recently went in to get my smog checked and failed two of the three tests: the functional and emissions. I've attached the VIR.
Mechanic said there might be a leak, so a buddy of mine checked the engine for a vacuum leak but couldn’t find anything.
What are the common sources for a failed smog check? I plan on getting a diagnostic later in the week/
smogcheckVIR.png ( 1.93MB )
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I tested the one in the truck when it failed smog, it came out at 400 millivolts key on engine off as my Haynes manual and the Autozone website said it should, after running the truck for 10 minutes and running it at around 1200 RPM's for 2 min to get the O2 cycling it doesn't, best I have gotten was a slow rise of about 0.01 millivolt rise per second to about 0.590 MV where it seemed to level off, the problem is 2 seperate new sensors do the exact same thing, none cycle rapidly between 100-900 MV as the Haynes manual and the Autozone website say they should.
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