RE: [T3] Tune Up & Brakes

["Jim Adney" <jadney@vwtype3.org>]

On 28 Apr 99, at 8:13, James MacNaughton wrote:

> 	Have you tested the advance with a timing light?
> 
> 	<<<OK, I'm dumb.  How is this accomplished?  One can actually
> measure mechanical advance with a timing light?  -- as the vacuum is
> disconnected to set the timing...

Set the timing, then with the engine still running, connect another 
piece of hose to the vacuum can on the dist and suck on it. If the 
vac advance is working the engine will speed up and if you watch the 
timing marks with the timing light while doing this, you will see the 
marks advance. This checks the vac advance.

Now, with the hose still disconnected, direct the timing light at the 
timing marks and give the engine some throttle. If the mech adv is 
working you should see the timing marks advance as the engine speeds 
up.

Then with the engine still running, reconnect the vacuum hose. The 
first thing you will notice is that the timing at idle doesn't change 
(on FI cars), thus the insistence on removing the vacuum hose is 
pointless, in this case.


Jim
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Jim Adney, jadney@vwtype3.org
Madison, Wis˂‡USA
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