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Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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GreenMagicMan
Posts: 56
Joined: Wed Feb 19, 2020 9:07 am
Year and Model: '07 XC90 3.2 AWD SI6
Location: VT
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Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Post by GreenMagicMan »

Hello fine forum people.

We have a 'loping' often surging / cycling sound on idle on the engine of a 160K miles SI6 (V6) 2007 XC90.
I read around that it is likely or first place to look anyway a vacuum leak.

Both our V6 cars have a diagram under the hood. But it basically just shows a single line in front of the engine under the intake. I've looked and can't find even that line in the engine.

Not sure about other lines to check.
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BEJinFbk
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Re: Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Post by BEJinFbk »

You'll get better results posting in the right section for your XC90:
viewforum.php?f=10
'98 V70 R - Well Equipped for Life Up North... ;)
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ggleavitt
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Re: Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Post by ggleavitt »

See if you can find what you're looking for in any of the diagrams. All the Volvo resellers have the same portal, this is an example- https://parts.volvocarslisle.com/Volvo_ ... ngine.html
2005 2.5T AWD-201k
2008 V8 AWD Sport-134k
chitownV
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Re: Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Post by chitownV »

What maintenance has been done to the engine over the years? Have you changed the PCV valve yet? If you pull the dipstick or open the oil filler cap while the engine is running, can you hear air rushing in?
2008 XC90 3.2 AWD - 150k miles, Premium, Versatility 7 passenger, Climate, Convenience, retrofit Morimoto D2S HID bi-xenon, iPd swaybars & poly bushing inserts, Powerflex poly control arm bushings, Bilstein Touring Fr struts, Bridgestone Dueler H/L Alenza Plus 255/55R18, Fr Infinity tweeters & speakers, hardwired cheap $17 Bluetooth to center console aux & pwr, CQuartz UK 3.0 ceramic coated, no oil consumption using Mobil 1 0W-40 even w/ my lead foot
GreenMagicMan
Posts: 56
Joined: Wed Feb 19, 2020 9:07 am
Year and Model: '07 XC90 3.2 AWD SI6
Location: VT
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Re: Can't find the vacuum lines (diagram or actual) for SI6 engine V6 2007 XC90 model

Post by GreenMagicMan »

I read this link, thank you. I am guessing there are many more vacuum lines than shown there. I can't seem to find a solid diagram for it all.
Looking at my notes from July, this V6 2007 was throwing CEL codes:
174 system too lean Bank 1
455 eval sys leak large

Flashing CEL the other day, and eventually driver told me they 'smelled something like hot glue / burning' and that the steering wheel was 'smoking' and pulled over finally and it was towed back to the home and has sat for 3 days.

PCV valve is unknown if / when changed. I will do a suction test on the oil filler cap today.
Unknown maintenance was a auction buy.
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