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Re: [T3] FI "A" Brain

On 19 Mar 2002, at 14:25, Mark Fuhriman wrote:

> Over the last few months, I have had a few episodes of difficult starting.  The
> car usually starts after about 2-4 revolutions, even after sitting idle for a
> couple of weeks.
> But every once in a while, it just doesn't want to start.  This happens only
> when cold.  Sometimes it will turn over and over without firing up.  Then, after
> a few minutes, it will start and drive just fine.

It's possible this is the "A" brain problem.The "A" brains had a tendency to 
flood the engine when trying to start in cold weather. I think they were just 
"over choked." I got around this in my 68 by just reaching under the dash 
and pulling the plastic plug off the fuel pump relay if it didn't start right away. 
This would let the fuel pressure sag down until the car started. Eventually I 
got good enough that I could put the plug back in as soon as the engine 
started to keep it running.  

> Other times, it will turn over and fire up right away, only to immediately quit.
>  Over and over again.  When this happens, it will usually start if I give it
> wide open throttle while cranking.  Then, it sputters to life.  Makes me think
> that sometimes it is trying to start with a fuel mixture that is too rich.

Except for the dying after starting, this really sounds like the "A" brain 
problem. I'd try the B brain. It was a big improvement.

It could certainly be something else, but this is a relatively easy thing to try. 
It could also be a bad connection somewhere, so it's also possible that the 
simple act of changing brains might fix it temporarily even if the brain is not 
the guilty party. So don't rush to any conclusions right away, unless the 
problem persists with the B brain.  

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

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