Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

P0171 Code, possibly low boost, Help?

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Old 12-18-2012, 05:35 PM
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Default P0171 Code, possibly low boost, Help?

Hi guys, I've got a 96 850 turbo that's recently lost most of its oomph, and now it's throwing a p0171 code, I removed and cleaned the MAF, and inspected the filter, but as soon as I hooked up the battery and turned it back on, the code was back immediately. Any help is appreciated, Thanks!
 
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Old 12-18-2012, 05:50 PM
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When I had that code I had a vacuum line loose. Check vacuum lines and intake tubes for holes or being loose.
 
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Old 12-18-2012, 11:45 PM
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Any Idea of exactly where I should begin, also do you perchance have a diagram?
 
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Old 12-19-2012, 05:13 AM
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Lol, look everywhere. There is a diagram under the hood. The only reason you should need one is if you have some pulled apart.
 
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Old 12-19-2012, 10:44 AM
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See if the attachment helps. Also, there is a plastic "Tee" fitting that is known to deteriorate over time on which 3~4 vacuum hoses are attached to.

JPN
 
Attached Thumbnails P0171 Code, possibly low boost, Help?-850-vacuum-dia-1-.jpg   P0171 Code, possibly low boost, Help?-850-vacuum-dia-2-.jpg   P0171 Code, possibly low boost, Help?-850-vacuum-dia-3-.jpg  
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Old 12-19-2012, 04:14 PM
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Hope these help. Some people have problems with the elbows coming loose or cracking as they age. JPN's diagram of the fuel pressure regulator is one place a lot of people miss as you can't see it very well without bending your neck and using a mirror and flashlight as it's under the intake manifold.
 
Attached Thumbnails P0171 Code, possibly low boost, Help?-vac-hose-routing-850-engine.jpg   P0171 Code, possibly low boost, Help?-turbo-vacuum-hose-diagram.jpg   P0171 Code, possibly low boost, Help?-vacuum-elbows.jpg  
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Old 12-22-2012, 11:39 AM
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Thanks guys, I got a smoke test done, turns out there was a 1 inch gash in the coupling right by the throttle body.
 
  #8  
Old 12-22-2012, 11:40 AM
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that'll do it. hope you're trouble free now!
 
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