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Author Topic: One way valve, brake servo  (Read 2561 times)

Offline nikkyboy

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One way valve, brake servo
« on: 06 June 2009, 20:05 »
Hi,  this may seem like a bit of stupid question  :embarassed:

I'm trying to solve popping exhaust on my 8v digi, used RJs digi tune up guide to set up the engine but it still does it when going from say 4 to 2.  So now I've moved on renewing vaccum hoses.  Should the one way valve thats connected to inlet manifold, suck air in through the little hole in the white cap?

cheers

Nik
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Offline rubjonny

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Re: One way valve, brake servo
« Reply #1 on: 08 June 2009, 08:43 »
if you mean the larger blanked off connection on the 1 way valve, no it should be completly sealed :)
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Offline nikkyboy

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Re: One way valve, brake servo
« Reply #2 on: 08 June 2009, 16:25 »
Cheers RJ, I've managed to upload the obligatory pic :smiley:



The pic shows the hole in the white/yellow plastic cap.  I didn't want to block it off and test the car just in case it would effect braking.
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Offline rubjonny

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Re: One way valve, brake servo
« Reply #3 on: 08 June 2009, 16:31 »
yeah that hole needs blocking!
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Offline nikkyboy

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Re: One way valve, brake servo
« Reply #4 on: 08 June 2009, 17:03 »
Cool.  Wrapped some gaffer tape around it as botch job and plugged the hole.  But now when i start it the car idles at 3k!  Completely closed the idle screw and I opened the co mixture right out to see if it made any difference, but nothing happened.  When I unplugged the blue temp sender the idle settled at about 2k.  Do i need to reset the timing or was that hole put there to hide a bigger fault?
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Offline rubjonny

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Re: One way valve, brake servo
« Reply #5 on: 09 June 2009, 10:50 »
you have cured an air leak so the idle/co will need resetting :)
make sure there arnt any more before you do though ;)
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Offline nikkyboy

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Re: One way valve, brake servo
« Reply #6 on: 10 June 2009, 13:18 »
Managed to solve the fast idle problem.  Turned out to be the throttle cable had twisted when I moved it so I could tape up the air leak, so the throttle wasn't closing properly!  Feel like a right plonker!  :smiley: 

Anyway reset everything and took it on a test run....still popping slightly when changing from 3 to 2.  So I guess I'm looking for another air leak!  :smiley:
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Offline rubjonny

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Re: One way valve, brake servo
« Reply #7 on: 10 June 2009, 14:35 »
if you have a bad zaust leak it can cause this :)
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Offline nikkyboy

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Re: One way valve, brake servo
« Reply #8 on: 10 June 2009, 15:07 »
Could be, the section to the manifold is old and tired, probably original parts and I can't find any other air leaks.  Gonna stick in a new GSF blue temp sender just to see if that sorts it, if it does its worth the effort trying to order a proper one from VW Leeds.  Maybe they'll answer the phone this time :smiley:
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Offline rubjonny

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Re: One way valve, brake servo
« Reply #9 on: 10 June 2009, 15:17 »
go to vw for the sensor, the pattern ones arnt very good :)
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