Weber vacuum leak! Help!
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Thread: Weber vacuum leak! Help!

  1. #1
    Opeler servicer is on a distinguished road
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    Weber vacuum leak! Help!

    I run a 32/36 DGAV and I just removed the plastic bushings on the primary throttle shaft for a set of bearings, this is an upgrade offered by Weber. now I have a bad vaccum leak at each end of the throttle shaft. I followed the instructions (even watched the video on youtube) and have taken it apart twice now. Vacuum leak isn't present when its running on the idle circuit only, but as soon as i turn the throttle speed screw up it starts to stumble right away and is off the chart on my wide band. I know this is the source of the leak as I have sprayed carb cleaner everywhere and it picks up as soon as I spray it at the shaft. I just cant figure it out. Hoping someone here has an idea, as you guys are definatly the Weber/Opel gurus. THX
    Last edited by hrcollinsjr; 03-01-2010 at 08:53 AM.

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    Just an old fart My location wrench459 will become famous soon enough wrench459's Avatar
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    Quote Originally Posted by servicer View Post
    I run a 32/36 DGAV and I just removed the plastic bushings on the primary throttle shaft for a set of bearings, this is an upgrade offered by weber. ... vacuum leak isn't present when its running on the idle circuit only, but as soon as i turn the throttle speed screw up it starts to stumble right away and is off the chart on my wide band.
    Sounds like you have more problems than just a vac leak at the throttle shafts.
    Black Horse

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    Solo II is fun in a GT! My location okieopel okieopel's Avatar
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    I would try a new Weber rebuild kit. It will cover a lot of bases for under $30. You may consider a new power pump while you are at it.
    Last edited by hrcollinsjr; 03-01-2010 at 08:54 AM.
    Dan
    'okieopel'
    Oklahoma Opel Preservation Society
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    Opeler servicer is on a distinguished road
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    I should have mentioned that the carb only has about 5000 km's on it, and was running fine before, I have been messing around with jets for a while now and just figured I would swap to the bearings, as it looked like a piece of cake. lol
    Last edited by hrcollinsjr; 03-01-2010 at 08:29 AM.

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    Tennessean Site Supporter My location hrcollinsjr will become famous soon enough hrcollinsjr will become famous soon enough hrcollinsjr's Avatar
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    Quote Originally Posted by servicer View Post
    I should have mentioned that the carb only has about 5000 km's on it, and was running fine before, I have been messing around with jets for a while now and just figured I would swap to the bearings, as it looked like a piece of cake. lol
    I would assume the bearing has a side that is supposed to face outward and second why don't you go ahead and list your jetting, just in case that may be an issue. Is this a stock or near stock 1.9, 2.0, w/header, w/different cam, etc.?

    Harold

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    Just an old fart My location wrench459 will become famous soon enough wrench459's Avatar
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    I would be more interested in knowing the W/B readings at different rpms and different loads.
    The carb should idle at appx. 3% CO which is around 12-13:1 afr.
    Are you having a tipin problem where it just lags a few seconds?
    Last edited by wrench459; 03-01-2010 at 11:56 PM. Reason: lost an "s" in one of the words
    Black Horse

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    1.9 pretty much all stock, header 2" exhaust, recent rebuild, nothing fancy
    since putting the bearings in my wide band readings are eratic now, fluctuating from 13-15 at idle when warmed up, readings are good throughout the rpm range, mid 12's under light acceleration, cruising/very light load is pretty steady around 15. when coming up to a stop as the rpm drops back down it really leans out 18-20 then after almost dying it will pick up again. thx for the help so far

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    Just an old fart My location wrench459 will become famous soon enough wrench459's Avatar
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    I've not seen the video but I'm sure that this was brought up.
    Two things come to mind.
    Is the secondary dripping fuel from the booster at idle?
    Is the carb base good and flat?
    Is the throttle plates installed good and square? Ok shoot me thats three.
    How much clearance is in the primary shaft? They should be a little loose. Just raise and lower the bell crank by hand. I don't know the spec but around .008 should be close. HTH
    Black Horse

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    Tennessean Site Supporter My location hrcollinsjr will become famous soon enough hrcollinsjr will become famous soon enough hrcollinsjr's Avatar
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    Okay, so you haven't done anything radical or bordline. You have been taking notes on the jet changes you've made, correct? So what jets are you running now?

    Harold

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    Opeler My location RedDon is on a distinguished road RedDon's Avatar
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    Weber Vac Leak

    I have had a idle problem with my 32/36 Weber 5a and have found out that the Weber's have a problem warping between the cover assy and the body allowing the carb to create a vac leak. I have had two old times tell me this and the only way to correct it is to either seal the area between the cover assy and body or get a new carb? Anyone having heard of this? :banghead:
    DJ

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    tomking My location tomking is on a distinguished road tomking's Avatar
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    Others that are experts will speak up, but couldnt you remove the cover and flat sand the two pieces to restore them to flat?
    TMK

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    Opeler My location RedDon is on a distinguished road RedDon's Avatar
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    Quote Originally Posted by tomking View Post
    Others that are experts will speak up, but couldnt you remove the cover and flat sand the two pieces to restore them to flat?
    That would be an option, but I/we would still need to make sure of the seal and I have many trail and error fix's Have you heard of this problem?
    DJ

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    tomking My location tomking is on a distinguished road tomking's Avatar
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    But there is a gasket between the two, so with flat surfaces it will not leak.
    TMK

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    Opeler My location RedDon is on a distinguished road RedDon's Avatar
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    Is that also a wish and a prayer for it not to leak? It already has a gasket that is a little thicker.

    I have stumbled on the real issue and my car has solid lifters and they needed adjustment and it cleared up the issue.
    DJ

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    tomking My location tomking is on a distinguished road tomking's Avatar
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    Well that is a far cry from a leaking carb. Good Opeling to you.
    TMK

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