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Declining gas mileage 04 V70R Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R
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Redbox
Posts: 74
Joined: 21 June 2011
Year and Model: 2004 V70R
Location: Maine
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Re: Declining gas mileage 04 V70R

Post by Redbox »

Update: Changed the plugs and upstream O2 sensor. No change at all with the declining mileage. Also seem to have an over-boost situation going on now. Not sure what to look at next, but have to get Vida set up.
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Redbox
Posts: 74
Joined: 21 June 2011
Year and Model: 2004 V70R
Location: Maine
Been thanked: 1 time

Post by Redbox »

I wanted to update this in case anyone checks it out. As stated, plugs and O2 sensor made no change. Yesterday I rebuilt the PCV system after failing the glove test. Not completely blocked, but pretty messed up. Took it for a good test drive today. Mileage went from 22 (before repair) to 29.3 mpg. No AC on. Nice. Oh and I fixed my over-boost situation with some Seafoam through the brake booster line. Runs smoother than it ever has with boost right where it should be. Now for the new e-brake cables...
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jonesg
Posts: 3501
Joined: 16 January 2008
Year and Model: 2004 V70
Location: Northern maine.
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Post by jonesg »

Redbox wrote: ↑07 Jan 2018, 17:15 Thanks so much everyone for the advice. I'll give VIDA another try (if it ever warms up outside). I think the PCV system is ok, at least no signs of trouble. I changed that all out on my old 850.
Vida needs a patch file now, the internal clock is set to expire Dec 2017.
Go to the vida forum.
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