Club 80-90 Forums

Just tried again, this time on gleaming metal. Nice thwacky spark from coil HT lead.

Grun wrote:Alan,
I have a couple of manuals which cover electronic / fuel injection systems, as it is rather new technology to me, (an old duffer).

According to what I have read, the Hall sender is a silicon chip through which is passed a small current from one edge to the opposite edge.
When a magnetic field passes through the major axis, (i.e. the face) of the chip, a (tiny) voltage is created across the other two edges.

(Think of it as a thin square) Current from left edge to right, voltage appears from top to bottom edge when magnetic field goes through the thin face.

The thing is that the sender needs a current feed and an earth return to provide its voltage output. So a perfectly serviceable hall sender will not work without the feed (and earth return) circuit.

This is what I believe 'bigherb' refers to when he says.......

before you replace the sensor check there is more than 5 volt across the two outside pins of the three pin plug.

I tend to stick to the old adage....... 'If it ain't broke..........' so having had (as yet) no problems with the distributor and associated gizmos, I can only tell you what the books say. They tend to be generalist, but feel free to ask and I will do my best to find what I can from them.

Mike