hissing on the passenger side while driving
09-18-2018, 07:46 PM
#22
Mark
iTrader: (1)
That’s the one !
09-20-2018, 03:50 PM
#24
Mark
iTrader: (1)
09-20-2018, 06:19 PM
#25
Improved but not cured. Not enough emphasis from group 🙂 on the SECOND check valve down the line. Pulled it; tested it; blows clear thru both ends. Will get the Motorcraft valve this time. Funny thing, (really?), after that valve failed my test I decided to put it back till tomorrow but blew thru it again and it worked properly, so I thought just maybe.....but test drive proved otherwise and when I pulled it and tested it again it failed. I’ll get this thing yet.
09-20-2018, 10:52 PM
#26
Senior Member
It's weird I know. The flapper inside these valves can have some small dirt or particles trapped that dislodge sometimes and other times don't. My new motorcraft valve was faulty out of the box. Third time was the charm. There's actually a THIRD check valve mounted on the brake booster's drum thing on the driver side firewall, this is the first check valve that comes in line with the hose leading from the main vacuum source on the engine. That one was fine when I tested it.
09-25-2018, 01:56 PM
#27
It's weird I know. The flapper inside these valves can have some small dirt or particles trapped that dislodge sometimes and other times don't. My new motorcraft valve was faulty out of the box. Third time was the charm. There's actually a THIRD check valve mounted on the brake booster's drum thing on the driver side firewall, this is the first check valve that comes in line with the hose leading from the main vacuum source on the engine. That one was fine when I tested it.
I cannot find the third check valve you're talking about, and didn't notice it in IWE vacuum diagrams. More info?
