'87 Jetta GLI 16V - progress

dave wrote:
> "Rex B" > wrote in message
> ...
>
>>dave AKA vwdoc1 wrote:
>>
>>>I have seen some cats that have lost their guts through the exhaust but
>>>the engines were still running fine with the 02 sensor online.
>>>I have also seen many 02 sensors installed in exhaust pipes, so they are
>>>not in the exhaust manifold nor cat.
>>>
>>>Just try yours and see. ;-)
>>
>>The tech told me his milliammeter would not come up into the working range
>>because the O2 sensor was not getting hot enough, so it needed a new cat
>>before he could tune it. But honestly I did not try it myself, nor did I
>>verify that the heater circuit was working. I will do that, thanks
>>
>>Rex
>
>
> Well that is a possibility, but I would have to see that myself. You can
> plug into the FPR, jump the fuel pump relay, turn the ign. on and read the
> current without the engine being on. At least that is what I remember and
> I usually do this to vehicles that don't start. :-)
> Remember that I am NOT plugging into the 02 sensor but the Fuel Pressure
> Regulator wiring.

I guess you use that standard test harness that you use to check
millamps through the FPR?