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Re: [T3] Dead Injectors Puzzler

On 12 Jan 2001, at 19:46, Keith Park wrote:

> Jim, see what you think of this theory too... (im just so full of
> theories, one of them has to be right!) 2 of the injectors fire at
> just the right time when the intake valve opens, 2 fire at the wrong
> time and that mixture has to sit there just a little before getting
> sucked in. 

I don't think this will explain it. The delay doesn't change the 
mixture once the engine is actually running. I think it MIGHT make it 
a bit hard to start, however. Still, this doesn't seem to be a 
problem with properly functioning cars which have 2 cylinder that 
fire "early."

> I remember the idling on 2 problem many hears ago, I dont remember the
> outcome, but I think it was a mixture problem... you can replace the
> head temp sens with a 5K potentiometer and then manually control the
> warmup mixture curve, down to about 60 ohms when hot... THEN, once the
> problem starts richen up the mixture but increasing the resistance and
> see if it evens out... if it does WALLA... you then know its not a
> wiring problem with the trigger points or injectors! and you need to
> see why the mixture is too lean.

I don't think there is a mixture problem, unless you want to call no 
fuel at all a mixture problem.  ;-)

We've now got one pair of injectors, normally triggered by the same 
trigger point, which run normally until something happens and they 
both cut out at the same time.

It has to be either the brain, the trigger points, or the wiring 
between the two. Mark's almost home.

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

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