Okay,got everything working again and rechecked the
truck. Fully warmed up:
MAP: 12.1 inHG at 680 rpm
9.2 inHG at 2500rpm
8.6 inHG at 3052rpm
8.0 inHG at 3600rpm
Timing advance: 13-20 degrees at 672-750 rpm
43 degrees at 2500 rpm
02 sensor 1 bank 1 fluctuates from .880-.060v
02 sensor 2 bank 1 fluctuates from .140-.620v
I didn't think sensor two had this much activity last
time I checked. I could not determine barometric
pressure. It is 1013 in my area right now,but nothing
correlates to that on my scanner.
Thanks.
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.
> >
> >
> >
> >
> >
> > --- "Bernd D. Ratsch" <bernd@dodgetrucks.org>
> wrote:
> >
> > >
> > > You can look at the pulse-width of the sensor
> and
> > > line pressure. If the
> > > sensor isn't showing 1psi per mph from 0-30mph,
> > it's
> > > bad (very common
> > > problem). As for using the HVAC gauge, I
> wouldn't
> > > run ATF through that
> > > gauge. You can use a fuel pressure gauge
> > (0-100psi)
> > > and use the line taps
> > > on the side of the transmission.
> > >
> > > - Bernd
> > >
> > > -----Original Message-----
> > > From: Steve Preston
> > [mailto:steveophonic@yahoo.com]
> > > Sent: Friday, July 20, 2007 8:37 PM
> > > To: dakota-truck@dakota-truck.net
> > > Subject: DML: Checking transmission line
> pressure
> > >
> > >
> > > Sup!
> > >
> > > I need to determine which is bad: the governor
> > > pressure sensor,or the solenoid. I'd hate to
> spend
> > > the
> > > considerable sum for a part that I don't need,if
> > > only
> > > one of them is bad. I've read that if the line
> > > pressure doesn't equate to 1 psi per mph as I
> > > drive,the transducer is bad,and if the pressure
> is
> > > right,the sensor is causing the problem. This is
> > on
> > > my
> > > work truck (2003 3.9 CC 42RE)
> > > that runs crappy (feels like engine miss and
> > doesn't
> > > want to upshift unless I back off the gas.) I
> > spent
> > > this afternoon checking the ignition system,and
> > I'm
> > > fairly sure the engine isn't causing it.
> > >
> > > First off,what's a wet gauge? I assume it
> measures
> > > transmission fluid pressure? Does anyone know
> if
> > an
> > > HVAC suction side pressure gauge would work?
>
=== message truncated ===
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