86 4kq mixture adjustment problem

Huw Powell human747 at attbi.com
Mon Dec 23 23:00:54 EST 2002

> I was in the process of adjusting the O2/fuel ratio using a dwell/tach meter
> connected to the two prong plug by the battery which I've used several times
> for this purpose, when it suddenly stop responding.   The plug is not dead
> but it dropped from the usual reading of about 36 to 40 on dwell scale to
> about 1 or 2.
> Does anybody know what could have caused this sudden drop.  I have looked
> everywhere for a bad connection to no avail.  I'm still not getting a
> reading.

Well, let's start with the fact that that connector is a tap in parallel
with the ISV, so you can measure its duty cycle.

To fine tune the static mixture, you adjust the 3mm thing in the FD
while measuring the current to the control pressure actuator.

Huw Powell



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