RE: [T3 ] More FI questions

["Drake ." <vw_type3@hotmail.com>]

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> noticed, with the temp sensor connected, if I worked the throttle with my
> hand I got the hesitation.  The Throttle would move about 1/4" then the
> RPM's would kick in, just as you discribed. And I can force this to happen

If I open the throttle with my hand on mine (slightly and in stages) I will 
get a momentary boost to RPM's then it will settle back down. Open it a 
crack more, and the same thing happens...etc etc until I get about 1/3 open 
or so, then the engine picks up. I know the TVS works and is adjusted 
correctly. The initial pickup of the RPM's is due to the extra squirt 
delivered due to the action of the TVS

I was under the impression that this was a noraml behavior, but I had the 
thought that perhaps the vacuum advance mechanisim is sticky, and there is 
no vacuum advance, and the engine does not pick up until the mechanical 
advance kicks in. Or perhaps the vacuum advance wont work until there is 
more vacuum.

As for the air temp sensor...I checked what mine did after you were talking 
about yours and the rpm's picking up when you unplugged it. Mine does the 
same thing. This confused me a little because things I have read concerning 
the FI state that this sensor really has very little effect on the operation 
of the FI. This sensor is supposed to fine tune the mixture adjustments 
across the entire range of operation. I did measure the resistance in mine 
but it was at operating temp. I checked the temp of the air distribution box 
with a K-type TC (engine off) and measured the resistance of the switch 100 
ohms @ 48C

I think I have actually pinpointed the problems I was having with my engine. 
While I was doing a first run on my bug engine after re-assembly, I decided 
to go back to basics with the square.

Fired it up, and let it get to operating temp, then started pulling plug 
wires one at a time. There is no difference when I pull #1, same thing if I 
pull the injector connection. I then checked compression and spark in that 
cylinder (100 psi) Looks to me like I have a bad injector (or wiring going 
to that injector only)

My next course of action is going to be checking the wiring out for injector 
#1, and physically swapping #1 and #2 injectors to see if the problem 
follows the injector. Also #1 plug is black..not seriously..but compared to 
the other 3 which on previous inspections looked fine (tan)

Perhaps I have an injector that fires erratically?


Drake
72 square stock
63 bug darkside
San Jose, Ca.


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