I know, I know. I respect him.....and you too, despite your anemic V6.
Just funnin' on a Monday! ......since I lost my a$$ on the SB. Chin up,
guys! :-)
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of bernd@texas.net
Sent: Monday, January 29, 2001 4:38 AM
To: dakota-truck@buffnet.net
Subject: RE: DML: Gas mileage to crap?
Now now Ron.
Shane is a person that I respect and he has his own data that he collects.
I've got no quarrels with him and don't need to start any either.
On the data, I have mine as well. From all the trucks i've played with
(tested), the O2 was not the determining factor for OPEN-LOOP. MAP, TPS,
and
Coolant Temp are the deciding factors. There's no way around that.
** Cold engine (cold temperature) = OPEN-LOOP
** Warm-Up (driving to warm up the engine) - at 140-150 degrees, it kicked
into
CLOSED-LOOP
** Warm Engine (cruising) = CLOSED-LOOP
** Warm Engine (WOT) = OPEN-LOOP (starts at about 3/4 throttle to boot when
MAP
is right about 2"hg.)
I can simulate the TPS and MAP signals using some test equipment I have but
the
easiest test i've done is at a warm-idle (CLOSED-LOOP). I forced the MAP to
3.8v and low-and-behold...OPEN-LOOP. (Didn't touch the TPS, IAT, CTS, or
O2.)
I also disconnected the rear O2 and checked the status (still warm-
idle)...check engine light but CLOSED-LOOP.
Sure the FSM's have their definitions of OPEN/CLOSED-LOOP, but from what
i've
seen/tested...the O2's have little effect on switching to OPEN-LOOP.
- Bernd
> <shuffle shuffle> ....donning asbestos suit....<ugh lug lug> donning
> bullet-proof vest <clomp clomp> ...walking into lead-lined room (to ward
> off kryptonite rays)...ahhhh...get comfy...ok, guys....let the fireworks
> begin! ;-D
>
> Ron
> 00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
> For modifications see my DML Profile (URL follows)
> http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
>
>
> -----Original Message-----
> From: owner-dakota-truck@buffnet.net
> [mailto:owner-dakota-truck@buffnet.net]On Behalf Of bernd@texas.net
> Sent: Monday, January 29, 2001 3:53 AM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: Gas mileage to crap?
>
>
>
> Well, take this lightly...but I can force OPEN-LOOP by just changing the
> voltage on my MAP Box. Watched that on the scanner (and Laptop). Didn't
> change anything else.
>
> - Bernd
>
> > "Bernd D. Ratsch" wrote:
> >
> > > I hope they don't bet on it...here's the facts:
> >
> > Sounds like you might want to bet on it. As far as facts - I have read
> the
> > exact same thing (from my FSM) - do I consider them facts? No -
> especially
> not
> > when I find out otherwise from experimentation. Good ole scientific
> method -
> > gotta love it.
> >
> > > There are 7 different modes (conditions) that are used (besides Key-ON
> and
> >
> > <big snip>
> >
> > > Under conditions 1,2,4,5,6,7...the O2 Sensor is ignored by the PCM. Y
> >
> > Uh - that would be 1,2,5,6,7 according to your data...
> >
> > > Yes, even in the FSM's..."During Open-Loop modes, the PCM receives
input
> > > signals and responds according to preset PCM programming. Input from
> the O2
> > > sensors is not monitored during Open-Loop modes."
> >
> > This says NOTHING about the transition from Open-Loop to Closed-Loop and
> EXACTLY
> > what causes the transition to occur. Furthermore, the word "Input" in
the
> > sentence that starts "Input from the O2 sensors is not monitored..." is
> somewhat
> > vague. Input for the purpose of what? Providing fuel and spark
delivery
> or
> > for determining when to transition from Open-Loop to Closed-Loop. These
> are
> two
> > distinct things that can both use the same input for a potential
different
> > purpose.
> >
> > > Anyone want to bet on it?
> >
> > Offer still stands.
> >
> > Latr,
> >
> > Shane
> >
> > --
> > '96
> IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs
> > '96 IndyRam-HerIndy-numbered(#142)"Track Truck"
> > '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle
> > '68 Black Corvette Convertible 427 (For Sale)
> >
> >
> >
>
>
>
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