IPD sale XeMODeX - Experts in Volvo Electronics

Get email notification of topic replies. Log in or register (free). Amazon Link Buy anything with this and it helps MVS!

Gas smell through vents

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Post Reply
mecheng
Posts: 1227
Joined: Thu Mar 27, 2014 7:49 pm
Year and Model: 1998 Volvo S70 T5
Location: Ontario, Canada
Has thanked: 4 times
Been thanked: 13 times

Gas smell through vents

Post by mecheng »

Hello all. After my wife had her front drivers fender hit, she started to notice a gas smell through the ventilation system.
When the car is moving you don't notice it, I guess because the fresh air is getting to the intake, but you notice it when you are at a stop. I removed the fender and I don't see any damage to the purge valve or canister and there is no engine codes. I don't see or hear any exhaust leaks.

Any idea what the cause could be? Would the purge valve make this kind of smell? I don't see any leaks or notice any smells in the engine bay. If it were bad, wouldn't it throw a code? Maybe the seal that covers the long shroud sealing the cabin filter has been disrupted? That is the only thing I can think of. All the screws are still present.
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice
User avatar
abscate
MVS Moderator
Posts: 22579
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 378 times
Been thanked: 1182 times

Re: Gas smell through vents

Post by abscate »

Tough one. Maybe there is a way to plug or vent the purge system overboard to see if that is the problem

The damaged evap system does seem most plausible. Though
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
mecheng
Posts: 1227
Joined: Thu Mar 27, 2014 7:49 pm
Year and Model: 1998 Volvo S70 T5
Location: Ontario, Canada
Has thanked: 4 times
Been thanked: 13 times

Re: Gas smell through vents

Post by mecheng »

Ok I did some more analysis. When you have the ventilation on recirc you don’t smell anything.

I did the glove test and it failed, it didn’t blow the glove fast but it did inflate it. When I pulled the dipstick I saw smoke. When the pcv system fails does it get into the vent? The smell is smells like engine bay, I’m not sure if it’s oil or gas. The top rubber seal that seals against the hood seems fine. I’m confused
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice
User avatar
ZionXIX
Posts: 657
Joined: Mon Aug 11, 2014 2:47 pm
Year and Model: 1996 850 Turbo S/W
Location: Texas
Has thanked: 9 times
Been thanked: 46 times

Re: Gas smell through vents

Post by ZionXIX »

I purposely leave my dipstick open to relieve pressure and I routinely smell oil smoke when I have the fresh air vent on.
mecheng
Posts: 1227
Joined: Thu Mar 27, 2014 7:49 pm
Year and Model: 1998 Volvo S70 T5
Location: Ontario, Canada
Has thanked: 4 times
Been thanked: 13 times

Re: Gas smell through vents

Post by mecheng »

I took a video of the smoking dipstick, I will leave it slightly open.

I also noticed the hose connecting to the ptc valve is oily. I believe that hose is part of the pcv if I’m not mistaken. Does that hose rupture or seep due to pressure?



What do you guys think?
Attachments
3BFB7BF9-A935-443A-AB4F-757356CB3956.jpeg
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice
Post Reply
  • Similar Topics
    Replies
    Views
    Last post