[Vwdiesel] ID on inj pump?

[Shawn Wright]

On 9 Aug 2005 at 23:17, Sandy Cameron <scameron at compmore.net> wrote:

> At 06:09 PM 8/9/05 -0700, you wrote:
> >Today I finally received a used inj. pump I got off Ebay. I bought it because
> >it appeared to be a 1.9 AAZ style pump modified with Vanagon throttle brackets,
> >and had what I thought was electric cold start advance. (a 2nd electrical
> >connection with a solenoid and a metal line leading from it. Now I see the pump
> >has the mechanical cold start advance, so I'm wondering if I am wrong in my
> >assumption about this 2nd solenoid. It appears that it may be a secondary fuel
> >cutoff for the delivery pump perhaps?
> >
> >The pump part # is 068 130 110N.
> >
> >Can someone shed a bit of light on this please? Thanks!\
> 
> >From the A3 Bentley, page 23-5
> 
> "Load dependant timing cut-off"
> 
> "The injection pump is equipped with load-dependant timing and boost
> pressure enrichment. The load dependant timing function retards pump timing
> during low engine loads for better fuel economy and lower emmissions. In order
> for the boost pressure ("space-ship") enrichment to function, load-dependant
> timing retard must be turned off during high boost/load situations"
> 
> How?
> 
> Checking the wiring diagrams reveals this actuator is operated by the A3s
> glow timing controler, a much more complicated gizmo than the old glow
> timing relay.
> Among other things, it turns on the glow plugs when the driver opens the
> drivers door, times for a while as you get seated and insert the key, then
> lets the engine be started almost immediately.. It also runs an after-start
> glow-on timer to improve early cold running and reduce emissions.. It has inputs
> from the door switch, the coolant temp sensor, an ambient air temp sensor, the
> tach signal from the alternator, and for all I know measures the pressure of
> your ass in the seat to make sure you really got in the car.
> 
> If you are retro-fitting this pump to an NA engine, forget about that gizmo
> altogether. Leave it there to plug the hole, but do not connect anything to it.
> If you are fitting it to a 1.9TD, and want to do all the agony, you will have to
> get a module from an A3 golf or jetta and duplicate the whole system. Again, I
> suggest you forget about it and just pollute a little more, and enjoy the power

Sandy,

Thanks for the complete answer! So it is not as simple as I hoped. The application is 
a 1.6TD in a Vanagon, so low load situations will be fairly rare. However, I like the 
sound of Loren's suggestion of a boost switch to detect low boost situations. I've 
heard of using a stock oil pressure switch for this purpose, but I suppose I'd need to 
add a relay, since the solenoid probably pulls too much current. 
And I guess the big question remains: where is the electric cold start advance, and 
what does it look like? I've heard A3s have it, but have not seen it. I'd love to find 
something that will work for the Vanagon without needing a 14ft cold start cable!

Shawn Wright
http://zuiko.sls.bc.ca/~swright
'85 Jetta D 
'88 Westy 2.1L, soon to be 1.6TD 5 speed
 (see progress at http://members.shaw.ca/vwdiesels)
'82 Diesel Westy