[T3] Trouble home from Bugorama

[Jim Adney]

On 13 Sep 2015 at 9:57, Jacob Adam Schroeder wrote:

> It was worth a shot, but I didn't observe anything unusual about cylinder 2
> over cylinder 1 when I performed this test.  It was cool to see the valves
> open and close.

If you were able to actually put a finger on each rocker and compare 
the action between them, then those parts must be okay.

It might still be useful to verify that #2 is getting spark and the 
right amount of fuel.

It's easy to test spark by putting the inductive pickup of your 
timing light on that lead and making sure it flashes.

Checking for the "right" amount of gas is harder. You can verify that 
the #2 injector is working by opening the throttle with the ignition 
ON but the engine not running. This will trigger one pair of 
injectors. You can hear them click and feel it, too, if you  put a 
hand on the injector. If #1 clicks, but #2 doesn't, rotate the engine 
enough to advance the dizzy by 180 and repeat.

Checking for too much fuel (injector not closing) is different. Start 
the engine, then unplug the #2 injector and see if the engine speeds 
up after a bit of time. If so, it was just flooded.

Anything that causes that cylinder to not fire can lead to carbon 
buildup on the valve seats and zero compression. You might still fix 
this without an engine rebuild. A burned valve is still a 
possibility, but it's not the only one, and it's a rare one in #2.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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