1998 S90 Evap purge valve (shut off valve)

anbran1 · Post by **anbran1** » 04 Feb 2014, 11:51

I've replaced this emissions component once with a used one....
The original one, when removed from the car, I could easily blow air through it. The used one, I couldn't...so I placed it on the car.

The negative pressure in the gas tank disappeared.

The negative pressure is back again....and the purge valve is easy to blow through now...!

Question: Are you supposed to be able to blow through the valve like that? Is that indicative of a non-functioning purge valve?

anbran1 · Post by **anbran1** » 05 Feb 2014, 12:45

Just replaced the purge valve with a new one (Dorman brand). I couldnt get air through the new one...and I saw a video on Youtube that says the purge valve is defective if you can blow air through it...

Installed the new one....NO pressure problems at the gas cap....!