Re: Knock sensor woes

["Bruce Plecan" <nacelp@bright.net>]

There are 6 recall service chips for false code 43s for that.
Try getting the newest memcal, from gm, and just send me th old one, if that
cures it <g>.....   Might se something else but that's where I'd start
Grumpy



> I've posted in the past to get help on other issues in the past few years,
> and while I stay in the shadows most of the time, the wealth of knowledge
> around here is amazing, so I'll have at it again if you all don't mind.
>
> I just picked up another Camaro (91 Z28, 5.0TPI A4) out in California, and
> like with any "new" used car, there are always a few bugs.  Right now I
> can't seem to clear a code 43, relating to the Electronic Spark Control
> system in the car.  This particular ECM ('730 / ''727) has the ESC module
> moved into the mem-cal, as far as I can tell from the GM Service Manual,
so
> I am assuming that the memcal is good because everything else works fine.
>
> I disconnected the knock sensor when I had the car jacked up and I
> connected an AC voltmeter to the sensor along with grounding to a known
> good groundpoint.  Running the engine at idle produces no AC signal on the
> voltmeter.  I figure that is normal considering the no-load
> condition.  Revving the engine up (engine IS in closed loop) produces no
> signal either.  Now I'm not sure about this.  Is this a normal
> condition?  I traced the sensor wire back to the ECM and it is fine, and
> not running close to spark plug wires.  The engine runs very smoothly both
> under idle and under load.
>
> The only other thing I can think of is that the car has been in California
> its entire "life", and it does have California emissions.  It has now been
> transplanted to Michigan.  Could there be a certain something with
> that?  I've been running 89 octane gas from Amoco, which has always been
> fairly good in my other TPI cars.
>
> Any ideas, inputs, points of stupidity that I may have missed?  I wish I
> had a scantool to peek inside the brains, but I know that all of us who
> don't wish for the same.  Whatever you guys can throw at me, I'm all
ears...
>
> Thanks,
>
> DK
>
> 91 Z28 Convertible, 5.0 TPI A4 2.77
> 86 IROC, 5.7L TPI, T56 6-speed, 3.73
>
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