[Fwd: New member needs help]

[J Norris]

That's not my problem.  Mine is going into Closed loop at 4.85 volts TPS.  At
this point it is trying to maintain a A/F ratio of 14.7:1 or 450mv on the O2
sensor.  Hence a lean condition at WOT.

David A. Cooley wrote:

> This is from what I have seen on the 84-87 Buick Grand Nationals...  Looking
> at the cal for the 85 shows a limit for TPS high and TPS low errors...
> Several other parameters have to be met to turn the check engine light on
> and set the code, but coming out of closed loop may be part of the error
> (The computer assumes the sensor is shorted and goes open loop with fixed
> fuel/timing etc)
>
> -----Original Message-----
> From: J Norris <jwn at sgi.net>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Thursday, November 19, 1998 11:38 AM
> Subject: Re: [Fwd: New member needs help]
>
> >Very interesting David.  How do you know this?  This seems to be exactly
> what my
> >car is doing.  The GM service manual says nothing of a high voltage.  Do
> you
> >know where you read this?
> >
> >Jason Norris
> >
> >David A. Cooley wrote:
> >
> >> At 10:18 AM 11/14/98 +1100, you wrote:
> >> >>
> >> >Doesn't ECU read high tps as large throttle opening and richen up
> >> >accordingly?
> >> >I don't understand
> >>
> >> It does to a point, but it also has a certain level that it uses to
> >> determine if the TPS is shorted or open... Depending on the car, Usually
> it
> >> goes to about 4.6-4.7V as normal operation... above that it thinks the
> >> wiring or the TPS is shorted.
> >> 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.
> >> ===========================================================
> >
> >