scan tools and WOT

Roger Heflin rah at horizon.hit.net
Wed Oct 14 14:02:29 GMT 1998



Terry,

Did you have diacom switched into normal mode, or did you leave it at
the default mode?  If you leave it set at default, I things work just
a bit different.  I am always careful to set it in normal mode, when
I have forgot and left it in default mode the car seems to act a
little different, at least I think it acts differently.   If you did
not switch it I think it is in ALDL mode.

			Roger

On Wed, 14 Oct 1998, Terry wrote:

> Andrew F. Gunnesch wrote:
> > 
> > That's interesting...  my TPI car, when the Diacom puts it into ALDL mode
> > (I haven't been able to get it to link in diagnostic mode) everything works
> > just fine.  I can watch the timing being varied too.  It drives normally.
> > 
> > Maybe that's because this is a TPI ECM?
> 
> 
> I made an interesting observation while at the track this past Saturday.
> I made 4-5 runs with Diacom recording data.  Then I made 5-6 runs with
> the Diacom disconnected.  Guess what?  I was both quicker and faster
> by .1-.15sec and 1mph with the Diacom disconnected....
> 
> Wonder why????  This is on any '87 TPI/MAF motor.  Is the ECM that slow
> that it can't optimally control the motor at WOT while transmitting
> data?
> 
> thanks,
> 
> T.
> 




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