[16v] DPR/mixture/timing questions

[amalventano1 at tds.net (Allyn)]

> Do you mean the ignition coil, or is there an internal coil 
> in the DPR? 

The DPR has an electromagnet (winding) within it - that coil.

>   Same thing happened with both DPRs, and the O2 sensor is new.

Ok, missed the extra DPR part.  Did you change just the DPR or the DPR+Fuel
Distributor (they work together, and therefore a failure in one can appear to be
a failure within the other).

> Originally, I had my test rig set up, and the DPR read 0.0mA. 
>  I leaned it out, and got it to .5mA (spec'd by Bentley as a 
> good average), then with no warning, it dropped back to 
> 0.0mA.  I didn't check the voltage at the O2 sensor at the time.

Those DPR issues are sneaky, especially where they are intermittent.  If -
before the drop to 0mA - you had fluctuating o2 with accompanying 'hunting' by
the DPR current, I would suspect you had it dialed in fairly close.  The sudden
drop to 0mA could only be explained by intermittent fault, ecu fault, open DPR
coil (intermittent), intermittent open on temp sender (as winchell suggested),
or perhaps some other de-tuning issue (timing, etc), that was gross enough to
force the ecu into open loop, but IIRC, open loop alone does not normally result
in 0mA.

HTH
Al