[T3] gas mileage, voltage, etc.

[William J]

 That's what I read " if  one injector sticks open none will fire "  I don't 
understand how the brain resets the circuit meaning after on pair fires it 
also resets the circuit so the other pair fires. This means then through 
transisters there is a switching process in laymans terms.

 It is possible though I've personally not seen it happen that even if the 
trigger points have a good external connection on the trigger point 
connector that where they connect from the female plug terminals to each of 
the 2 points could be intermittent . Or it's just all in the brain since 
Daniel seems to end up with quite a few faulty ones .

 The question I see brought up was a possible voltage spike or intermittent 
short that might be killing the brains . That's why in one post I brought up 
the cold start relay because I recall Daniel having issues with the pressure 
switch at one point . On the pressure switch which is an enrichment device 
as I understand it there is wire #14 & 9 both go to the brain , on Wire # 14 
in the Bentley page 17 fuel system I see # 34 above  # 14 , #14 only shows 
in the cold start relay. Also #32 & #33 are from the cold start relay to the 
cold start valve also #30 which goes to the thermo switch which tells the 
air temp determines when the cold start system needs to operate.

 My question is the diagram does not show a physical connection of #34 to 
#14 yet is there one ?  Are #14 and # 34 2 leads into one connector on the 
pressure switch? If so is it possible there is a short in the cold start 
circuit or the cold start relay itself that's affecting #14 at the brain? 
Relays can do all sorts of odd things intermittently.

 It's just a thought and something I would look at and not rule out. I have 
no idea where the cold start relay is .
----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Monday, June 26, 2017 9:32 PM
Subject: Re: [T3] gas mileage, voltage, etc.


> On 26 Jun 2017 at 20:44, William J wrote:
>
>> Based on what you are wrote and now have the reverse of what you had 
>> before it
>> seems there may be some issue with the trigger points either sticking 
>> which from
>> what I've read should cause the engine to stop running yet I can't verify 
>> that
>> as probable . To me it would seem that if one pair of injectors either 
>> stuck
>> closed or more likely open the 2 cylinders would have no fuel injection 
>> or fuel
>> delivery .
>
> It's important to understand that the circuitry in the brains is set
> up such that each trigger point not only triggers a pair of
> injectors, it also resets the circuit that triggers the other pair of
> injectors. So, if one trigger point sticks open, no injectors will
> fire. This happens sometimes if a piece of non-conductive dirt falls
> into the contact gap. This will bring the car to a halt until the gap
> is cleaned.
>
> If a trigger point contact sticks closed, which can happen if the
> rubbing block is worn, I'm not sure what the result will be, but I've
> worked over Daniel's trigger points and reset their gap, so I'm
> fairly sure that can't be the problem.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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