Re: Just got my TPI running...questions...

[Shannen Durphey <shannen@grolen.com>]

Generally code 42 is set when the ecm detects too high/too low voltage
on the bypass line.

More specifically, if you disconnect the set timing connector and run
the engine, you set a code 42.

Before diagnosing this code, make sure that it's current.  Clear all
trouble codes, start the car, see if it returns.

Running the wiring harness too close to the plug wires has been known
to cause intermittent code 42/43.
Shannen

Tedscj@aol.com wrote:
> 
>  Well, I just spent the last two weekends installing a TPI system on my car
> and just got it started after it turned dark on this Sunday night.  And since
> it's already dark by the time I get home from work, I guess I won't get to
> work on it more till next weekend.
> But I immediately ran into a couple of problems.
> The one you all might be able to help me is ... is there I source on the net
> that details error codes.
> I immediately got an error code 42 'spark control failure'.  But I know there
> are a few different things this can be.  The ECM seems to read the RPM just
> fine, and the advance (watching with timing light) seems to follow the
> commanded advance, so I'm not sure what the problem is exactly.
> Here is a little background info: SBC, 727 ECM, AUJP BIN.  When I rev it up
> to 3000RPM, it runs rough and the tach. goes nuts.  It never did this before.
> I don't know if this info is pertinent, but the distributor is the large HEI
> coil-in-cap.  I bought a distributor off of EBAY. It was the Computer control
> variety, but it had a V6 cap on it!  I though I had been ripped, but luckily
> I looked underneath the cap and it was indeed a V8 distributor.  But I am
> using my old cap that was from the '75 HEI distributor.  Are these
> interchangeable? Or do I need to get the 'right one'?  Perhaps the posts are
> keyed just enough degrees off to be causing a problem?  Tomorrow, I'll buy a
> new one regardless, but I'm still curious to know.
> But the main question is 'What exactly does code 42 mean' and does anybody
> have a link to a sight that lists all the error codes and details to there
> exact meaning.
> 
> Thanks,
> Ted
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