Reply to myself.....can't get Elmscan program to work
now. Formatted and reinstalled XP a few days ago,and
now it's all bad.
Need to find out what's wrong tomorrow.......
Steve P.
--- Steve Preston <steveophonic@yahoo.com> wrote:
>
> Bernd,thanks for the response!
>
> The scanner does have some type of log function that
> I
> need to figure out this week. About the cat,I can
> say
> for sure that it is operational. Don't know about
> plugged,but the after cat O2 sensor has very little
> fluctuation. When I crack the throttle,I do see a
> lot
> of response out of it for an instant,then it
> immediately settles down. Pre-cat sensor fluctuates
> as
> normal.
>
> I have suspected the cat myself,because the Dak will
> sometimes recover and run very well sometimes after
> I
> run over bumps in the road. It's happened enough
> times
> now to where I'm fairly sure it's not just my
> imagination or coincidence. Of course,there's a few
> things that could react to jarring. But I could
> kinda
> visualize that brick bouncing around.
>
> I'm gonna go see what kind of MAP reading I get from
> my scanner........
>
> Steve P.
>
>
>
>
>
>
>
> --- "Bernd D. Ratsch" <bernd@dodgetrucks.org> wrote:
>
> >
> >
> > Easy way to tell on a bad MAP: "Baro" reading on
> the
> > scanner. It should be
> > close to what your actual barometric pressure is -
> > you can easily check that
> > with a weather website in your area. Normally,
> 29.0
> > - 29.5 is the norm with
> > 30" during a storm (high/low pressure changes).
> If
> > it's at 31" or
> > 27"...something is wrong with the sensor.
> >
> > The sound you described also strikes a flag -
> what's
> > the engine vacuum at
> > idle, 1500rpm, normal cruising, and at WOT?
> Reason
> > for asking is you can
> > tell if a cat is plugged up by checking the
> vacuum.
> > If it's plugged up, the
> > vacuum under WOT will not go down to "0" and will
> > rise slowly but steadily
> > (WOT run on the Highway or lonesome street is a
> goot
> > area to test this).
> >
> > Does your Elmscanner allow for saving data log
> files
> > (Sensor data) and if it
> > does, can it be saved into a standard file to
> > read/email?
> >
> > - Bernd
> >
> >
> >
> > -----Original Message-----
> > From: Steve Preston
> [mailto:steveophonic@yahoo.com]
> > Sent: Saturday, July 21, 2007 8:36 PM
> > To: dakota-truck@dakota-truck.net
> > Subject: DML: Was checking transmission line
> > pressure,now other stuff.
> > (Bernd)
> >
> >
> > TPS is rock solid. I checked it with an ohmmeter
> > first,then double-checked with the Elmscan when I
> > got
> > it. Couldn't duplicate a bad spot or a jump in
> > resistance in the wrong direction at all. Smooth.
> >
> > The MAP is a possibility. I don't remember seeing
> a
> > reading from it.
> >
> > The other day,I slid the rear slider open and
> > listened
> > to the engine while I drove up a steep hill,and
> > swore
> > I heard it sputter,but the sound of the exhaust is
> > bad
> > anyway. It has like a "listening through a tin
> can"
> > sound. There is no rattling like the brick loose
> or
> > anything,but the tone of the exhaust just has a
> > metallic,hollow sound. My own 3.9 Dak I used to
> have
> > never sounded like that,I don't think.
> >
> > I probably need to see what's going on with the
> > engine
> > vacuum. I have a new digital manometer for HVAC
> > use,maybe that'll work. Reads in inches of water
> > column. Wish it was analog though.
> >
> >
> > I'll try to pick off your list of suspects one by
> > one,Bernd. Thanks!
> >
> > Steve P.
> >
> > --- "Bernd D. Ratsch" <bernd@dodgetrucks.org>
> wrote:
> >
> > >
> > > TPS can also cause the erratic shift...normally
> > only
> > > at light throttle
> > > cruising speeds but it can cause problem shifts
> if
> > > there's a "dead spot" in
> > > the TPS circuit. If you have an analog volt
> meter
> > > (simple needle on a
> > > gauge) you can measure the TPS and watch the
> > > "sweep". Connect the + side of
> > > the meter to the TPS signal (back probe the
> > sensor)
> > > and the - side to
> > > ground. Key ON/Engine OFF, move the throttle
> and
> > > watch the needle (it will
> > > go from about .5v to 4v as you move the
> throttle).
> > >
> > > Things that can cause erratic shift (electronics
> > > wise): TPS, Governor
> > > Pressure Solenoid, TCC Solenoid, Pressure
> > > Transducer. Erratic surging: IAC,
> > > TPS, MAP, actual tune of the engine (plugs,
> wires,
> > > cap, rotor)...so if you
> > > check all the basics first - you'll narrow it
> down
> > > rather quickly.
> > >
> > > - Bernd
> > >
> > > -----Original Message-----
> > > From: Steve Preston
> > [mailto:steveophonic@yahoo.com]
> > > Sent: Saturday, July 21, 2007 8:57 AM
> > > To: dakota-truck@dakota-truck.net
> > > Subject: Re: DML: RE: Checking transmission line
> > > pressure
> > >
> > >
> > > Thanks for the reply,Bernd!
> > >
> > > I don't have anything to read any transmission
> > > sensors
> > > with. My Elmscan 5 will do the engine sensors
> > > (only,apparently). About all I can do is measure
> > > actual fluid pressure with a gauge and look at
> my
> > > speedometer.
> > >
> > > I'm a little concerned that I can't find anyone
> on
> > > the
> > > internet that has had either the sensor or the
> > > solenoid cause erratic surging and intermittent
> > > performance. All I can find is complaints of
> > second
> > > gear starts and failure to upshift. Maybe I need
> > to
> > > verify that the fuel system and the engine
> vacuum
> > is
> > > not causing anything before I blame the
> > transmission
> > > for causing that one symptom for sure.
> > >
> > > Steve P.
> > >
>
=== message truncated ===
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