Timing advanced too much

[SGKent]

[Holzy22]

Well I thought I was in the clear, I switched the lines back (switched the red and yellow from the pic shown) and timed it with the dist/carb line disconnected and plugged. All was looking good, running great, timed at 7.5. So I plugged the dist/carb line back up to the dist, no raise in idle, great!! I throttled up and down a few times then let it right off, and it idled higher and the timing was off. So i removed that dist/carb line and the idle dropped. So now I assume there is still some vacuum pull at idle from the carb and I will have pull of the carb and take a look.

So I was thinking, wouldn't the amount of idle set effect the fully closed blade position in the carb at idle? If the idle was set even a little more that 0, wouldn't that open the blade up enough to create vacuum on the distributor? Should one start with absolutely no idle adjustment?

Uhgggg, but I do love figuring this stuff out.

[SGKent]

before you pull the carb off, why not try to find a hose diagram for the carb. Also, if you did this with the engine cold and not fully warmed up, the system does not fully function until the engine is warmed up.

Last, most distributors need a couple drops of oil on the felt pad under the rotor next time you service it.

I found this photo of another 1994 Brazilian bus for sale. It shows the hoses. That does not mean it is correct. Click on photos to expand.

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[Holzy22]

Thanks for those pics, just nice to see someone with the exact same setup as me!!

Going to vacuum guage all those ports tonight.

Very tough to find schematics on those carbs but I will keep looking.

[Holzy22]

Ok, an update for anyone still interested.

Put the vacuum gauge on and absolutely no vacuum at idle from the vacuum port to the distributor. it does pull nice vacuum when throttled.

So, when the line is attached to the distributor and I hit the throttle and it comes back down, it idles a little higher. Then right after this if I remove the line, the idle drops back to original.

So, since I have no vacuum pull at idle, I have to assume that the vacuum diaphragm ( or cannister, not sure what its called ) attached to the distributor must stick a little. Or I have to drop a little oil on the felt pad as per SGKent.

In any event, its not vacuum from the carb, so I will assume timing to 7.5 at idle and no vacuum will be correct here.

[heimlich]

There is a plate inside the distributor that the vacuum advance attaches to. That plate can get sticky and gummy. Also, as mentioned the felt under the rotor. You can easily test the rotor by turning it by hand with the cap off. If when you return it, it does not return back to original position, then it is gummed up.
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[SGKent]