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Location:
Adelaide
Registered:
June 2003
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Re: 18R_GU vacum advance
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Sat, 18 December 2004 11:23
 
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If you're driving an 18rgu, I don't reckon it's the vacuum advance that's the problem.
Very easy to tell though.
Itf it i the vacuum advance, when you take off the tube at idle, your idle speed should drop, that is if you have it connected to manifold vacuum (where it should be to work).
What your problem is from my experience is with the carbies. If your part numbers are 88254 and 88255 generation numbers then I know what the problem is.
These carbies did not have the accelleration pumps adjusted correctly from the factory. They do not work!!!
Can this problem be fixed?
Absolutely, all you have to do is rip off the carbies, examine the accelleration pump push rod (from the throttle shaft to the lever beneath each carbie.
Take off the little pin and add a few small brass washers (hardware store) between the pin and the spring.
This is a simple fix and if you know how long the pumps are supposed to work for (a little over a second) you can set them up correctly, like they should have done from the factory.
More washers = longer discharge time and stronger squirt.
Also check the direction of your accelleration pump jets (the flathead screws near the idle mixture adjust screws.
They should shoot straight through the manifold into the ports.
Note: There is a flat locating side on the jet, this mush align with the flat side in the hole it goes in. Small adjustments can be made carefully with pliers (there is a little slack)
If the problem isn't this then I'll be really, really surprised.
Every set of these carbies I've seen has effectively had no accelleration pump because of this adjustment issue.
Good luck with it, it can be done comfortably in a day.
Make sure that the pins you put back in are made from something tough, soft ones (twitching wire) wear through and the springs get lost!!
Steve M
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| | Subject | Poster | Date |
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18R_GU vacum advance
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christo | Sat, 18 December 2004 08:36 |
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Re: 18R_GU vacum advance
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munki | Sat, 18 December 2004 09:11 |
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Re: 18R_GU vacum advance
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christo | Sat, 18 December 2004 09:20 |
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Re: 18R_GU vacum advance
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thechuckster | Sat, 18 December 2004 09:26 |
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Re: 18R_GU vacum advance
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Steve M | Sat, 18 December 2004 11:23 |
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Re: 18R_GU vacum advance
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christo | Mon, 20 December 2004 00:41 |
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Re: 18R_GU vacum advance
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Mr DOHC | Mon, 20 December 2004 08:26 |
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Re: 18R_GU vacum advance
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allencr | Mon, 20 December 2004 15:17 |
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Re: 18R_GU vacum advance
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people100 | Tue, 21 December 2004 08:18 |
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Re: 18R_GU vacum advance
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SilverGhost | Wed, 22 December 2004 07:46 |
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Re: 18R_GU vacum advance
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M.W.P. | Wed, 22 December 2004 11:57 |
