scan tools and WOT

[Kevin Crain]

Looks like my new MPSI from Linder does same thing, you have to manually
tell it to put the car into normal run mode or it puts it into diag mode.

-Kevin

On Wed, 14 Oct 1998, David A. Cooley wrote:

> At 08:25 AM 10/14/98 -0500, you wrote:
> >
> >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?
> 
> Diacom is probably putting the car into 10K ALDL mode.  This fixes timing,
> raises idle etc so the tunings are no longer optimal.  Timimg is no ;onger
> varied by the chip according to the tables *or* knock sensor.
> Might check with Rinda Technologies and see if they have a way to allow the
> ECM to be in normal mode while Diacom is linked.
> Later,
> Dave
> 
> ===========================================================
>            David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>      Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
>        I am Pentium of Borg...division is futile...you will be approximated.
> ===========================================================
> 
>