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Re: [T3] Erratic Behavior #3

On 25 Oct 2005 at 17:57, shalom@ucla.edu wrote:

> 2) I've also changed the trigger points, when I did the coil and everything
> else.

It COULD be a bit of dirt getting into the trigger points, but 
probably not. If you want to clean them, just remove them and slide a 
clean piece of paper thru there. Don't file them and don't let the 
paper snag and leave any lint behind.

> 3) I had a fuel pressure gauge attached to the fuel line while this problem was
> occuring and I still saw 29psi(the correct pressure).  I would assume that if
> there was something in the fuel tank/filter than I would see pressure drop.

Okay, that eliminates a lot of possibilities. The fuel pump, filter, 
main relay, ECU ground, fuel pump relay, fuel pressure regulator, gas 
tank, and the wiring to each of these is all fine.

> 4) it does seem that when it stalls it seems to misfire and then stall.

Check dwell and timing. If the coil is not OE (black) Bosch, find a 
good original coil and replace it. If the points and condensor are 
not Bosch, replace with Bosch.

> 5) I have not tested the fuel relay, I'm not sure where to find it.  I found the
> regulator and main relay under the back seat but the fuel relay wasn't back
> there.

It's under the dash, mounted on the firewall, up and left from the 
steering column. You've already tested it and it was not the problem.

> I have a question about this "vaporlock" idea.  So are you saying that
> somewhere, the fuel line is touching a really hot part of the engine that is
> making the fuel turn into vapor?  Do you have any idea where I should look for
> it?

Vaporlock is not a possiblity with the FI fuel ring. It only happens 
on cars that have to suck fuel from the gas tank. The FI system 
delivers gas under pressure and the pump is under the tank where it 
is cool and the gas flows to the pump under the pressure of gravity..

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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