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"Ed" <jag_manR__EM*-0_V_E653@xxxxxxxxxxx> wrote in message
news:xBJQf.259$tN3.60@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
> I have two digital multimeters of the type typically used by auto
> techs. One has
> a 0 resistance reading of 0.6 Ohms, the other 0.3 Ohms. What
> accuracy can be expected
> if I measure a resistance in the 0.5-1.0 range and subtract the
> meter 0 value?
>
> TIA
>
> Ed
Thanks to all for their responses.
I guess I should have given the specific context of my question. The
resistance in question
is that of the primary winding of an ignition coil, more specifically
a 2-coil pack as used on
the GM 3.8L V6 engine. The spec is 0.5- 0.8 Ohms. By subtracting the
short resistance of
the meter(s) I get about 0.4 for each of the 3 coil packs. The dealer
replaced them because
they were "out of spec," although the tech didn't record the actual
readings he got. The
charge was close to $300, parts and labor. Unfortunately, it didn't
fix the problem, which
is an intermittent engine miss. Right now I'm trying to get my facts
together to approach the
dealer for possible refund or credit towards a second try at fixing
the car. At the same time
I'm under pressure at home to get on over to the Toyota dealer.
Ed
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