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OBD-II Code P0410, 1997 850 ???? 850

posted by  someone claiming to be Glen: 850, 940, 740 Turbo on  Sun Jan 26 13:42 CST 2003 [RELATED]

We're a Volvo family (850 wife's, 940 mine, 740 Son's), but this is wife's car so if I don't fix I'm dead meat !

Hers: 1997 850 non-turbo, auto, 52,000 miles, always garaged.

Symptoms:
a) Blows black soot out tailpipe, but drives OK
b) Bad gas milage (about 16-17 mpg, when 27 is normal)
c) Sulfur smell
d) Check engine light sometimes comes on
e) Using Alex Peper's OBD tool, I got a scan code P0410, "Secondary air injection, incorrect flow detected" (O2 sensors say OK)
f) Also reset that damn "Service" light - YAY !!!!
g) Ooops...Weird part: this problem hapened before a few months ago then went away. Sometimes even now the gas mileage will be OK for a while.

I read the posts re SAS valve, air pump, check valve, etc. and am a little confused where to start.

Is this a 1) SAS bad valve , 2) Air pump check valve, 3) Air pump bad, 4) Other ?

I'm pretty good with tools, but need to know where to start with this one.

Thanks

Glen

(Now gotta get the kid to help replace the head gasket in his 740 turbo. My 940 wagon runs just fine, thanks ! )







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    OBD-II Code P0410, 1997 850 ???? 850

    posted by  SFCANB3 on  Sun Jan 26 15:43 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

    I had the same code on my 87 850. I finally traced it to the rubber vacum line that runs from the flame trap then under the intake and connects to the other side of the intake. The line on mine had a small split from heat damage. The funny thing is it did not leak all the time. Gas mileage and performance were erratic. I replaced it with a longer hose that I ran around the front of the engine. My wife was "much pleased." Hope this helps.

    email
    nbrown@jam.rr.com







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