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Re: [T3] Wire #18 missing in FI.


On 1 Mar 2005 at 15:26, Toby Erkson wrote:

> I hooked up my FI system to my tester (VW 1218) and it failed test #14:
> http://www.icbm.org/erkson/ttt/engine/fuel_injection/Image50.jpg
> Turns out the wire on terminal #50 is missing :-(
> 
> The car does run and the temp sensors passed.  But the car doesn't have 
> very good acceleration and the top end seems to be limited to about 
> 75mph.  Valve adjustment, throttle position sensor, timing and point gap 
> have all been done. Though I haven't done an actual mileage computation, 
> shooting from the hip I'd say it's about 15mpg to 18mpg.  Suggestions?  
> Could the missing #18 wire be an issue?  What's it for?

That wire tells the brain that you're trying to start the engine and to enrich 
the mixture a bit. It works in addition to the cold start valve. It would be 
pulled to 12V during cranking, but would be actively pulled to ground when you 
let the key go from START to ON. I don't know if letting it float would have 
any effect, but it might tend to float up and enrich things. I would either try 
to find the other end of it and connect it to the proper terminal on the 
starter, or ground it.

Have you verified that both the vacuum advance AND retard are working, as well 
as the mech advance?

The gas mileage still seems a bit low, so how about the pressure sensor hose 
and the charging voltage?

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

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