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P0442 - Smoke Testing

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

br0dy519
Posts: 13
Joined: Tue Dec 17, 2019 5:46 pm
Year and Model: 2004 XC70
Location: Windsor, ON
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Canada
br0dy519

P0442 - Smoke Testing

Post by br0dy519 » Sun May 31, 2020 3:48 pm

Hi all,

Wife's 2004 XC70 has the dreaded EVAP Leak. I've done the following:

1) Swapped fuel cap with my S60 , engine light returned and my S60 is flying with no xmas lights.
2) Leak detection pump test on VIDA, comes back OK
3) All software updated to latest Rev from dealer
4) Tested and replaced the failed purge valve (verified w/ battery test, solenoid not moving)
5) Visually inspected J-hose, couldn't find any split/rot/leak source there (Had to use phone/mirror to see, it's in a crazy spot above the prop shaft in this car)

It is time for me to do a smoke test. I know how I'm going to make the smoker. I'm wondering where I'm supposed to plug the smoker in. Is the recommended place on that snap/compression fitting that I removed from the purge valve? Looks like a 1/2OD hose that I would use.

Thanks guys. Couldn't find this info in my exhaustive searches.

jimmy57
Posts: 6588
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
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jimmy57

Re: P0442 - Smoke Testing

Post by jimmy57 » Sun May 31, 2020 4:07 pm

You can use the hose to the purge valve for the connection and you have to seal the vent hose that runs up the filler neck and will have a cylindrical filter at the end. I have some rubber cap that I keep anytime a part has fittings capped off. A short length of the right size hose with something stuck in it will act as a cap also. The canister vent is normally open and is only closed to do leak test by the ECM so it will be open and smoke will come out there without finding the real source. J hose is often leaking but not found by visual inspection but when smoked it will show smoke
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br0dy519

br0dy519
Posts: 13
Joined: Tue Dec 17, 2019 5:46 pm
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 2 times
Been thanked: 1 time
Canada
br0dy519

Re: P0442 - Smoke Testing

Post by br0dy519 » Sun May 31, 2020 4:58 pm

Thanks Jimmy. I'll make sure to cap off the other end of that vent canister.

Any tips/tricks to replacing the J-hose on an AWD car? Only seen mention of FWD being accessed above the heat shield above the muffler which seems irrelevant in my vehicle.

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