[Vwdiesel] electric thinggy on front of 1.9 pump

dieseltdi at verizon.net dieseltdi at verizon.net
Sun Sep 20 12:54:48 PDT 2009

The problem with using the switches on the pump (which are for AC cut  
out) is that they OPEN when you accelerate meaning no power goes  
through them and they Close when you deccelerate.  This is exactly the  
opposite of what this thing needs.  When you accel it needs to be  
closed (no power applied) and open (power supplied) at least that is  
the way I understood the Bentley test procedures for it.  Hayden

On Sep 20, 2009, at 1:57 PM, Edward Lowe wrote:

> So,
> This sounds like something good to have.  I think most who use the  
> AAZ engine just leave it disconnected.  Would it not be possible to  
> get the goodness out of this feature by inactivating it with a  
> simple boost pressure switch?  What about those switches on the top  
> of the pump that seem to be activated by a cam that shows throttle  
> position-- could they be used to inactivate the load dependant  
> timing solenoid?  ( We're talking hear about the solenoid and little  
> pipe on the side of the 1.9 AAZ pump, right?
> Is there anyone out there who has understanding of this thing that  
> could explain the function step by step?
> ED LOWE seattle
> On Saturday, September 19, 2009, at 08:54AM, <dieseltdi at verizon.net>  
> wrote:
>> For all those folks who are just have to know what this thing is.
>> Here is the quote from the Bentley Manual:
>> "The injection pump is equipped with load dependent timing and boost
>> enrichment.  The load dependent timing function retards pump timing
>> during low engine loads for better fuel economy and exhaust
>> emissions.  In order for boost pressure enrichment to function, load
>> dependent timing must be turned off during high boost/load  
>> conditions."
>> This device is controlled by a very different and very expensive
>> "automatic glow time control module.  Now you know....and knowing is
>> half the battle....GI Joe!!!!  Um sorry..... Hayden

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