Best way to check the TPS is with an analog meter. The best DVOM's can't
show a smooth swing as good as an analog meter can.
It's a Governor Pressure Solenoid - not a sensor. Yes, we see them fail
quite often on higher mileage vehicles. There is an updated solenoid that
doesn't seem to cause the issues like the older ones. Replace the
transducer as well.
- Bernd
-----Original Message-----
From: Steve Preston [mailto:steveophonic@yahoo.com]
Sent: Thursday, October 04, 2007 10:10 PM
To: dakota-truck@dakota-truck.net
Subject: RE: RE: DML: RE: Idle,now V6 issue again..
Bernd,is it more likely to be the governor pressure
sensor? The truck acts like something's confused when
it craps out. The solenoid,I would think,wouldn't tend
to cause rapid fluctuations,but a constant wrong
pressure from time to time. Do you normally see one
fail much more often than the other? If they always
fail together,I guess I can change them both.
BTW,the tps has always read smooth and linear on the
scan tool,and meter. No intermittent spots.
Thanks!
Steve P.
--- "Bernd D. Ratsch" <bernd@dodgetrucks.org> wrote:
>
> Ok...you just mentioned something that may very well
> be the problem.
>
> Transmission doesn't shift unless you let off the
> pedal - most common issue
> is the governor pressure solenoid and transducer.
> Only way to replace them
> is to drop the pan. Once your in there, might as
> well adjust the bands and
> change the filter as well. If the line pressure
> isn't correct (or has
> erratic readings), it can cause the truck to "lurch"
> or jerk back and forth
> under steady cruising speeds.
>
> In some cases, the TPS can cause similar issues but
> will not cause having to
> let off the pedal to shift (that's line pressure
> related).
>
> - Bernd
>
> -----Original Message-----
> From: Steve Preston [mailto:steveophonic@yahoo.com]
> Sent: Thursday, October 04, 2007 8:24 PM
> To: dakota-truck@dakota-truck.net
> Subject: Was: RE: DML: RE: Idle,now V6 issue again..
>
>
> Thanks for the reply,Bernd.
>
> I have replaced the Map sensor,plugs and plug
> wires,pcv valve,swapped pertinent relays (fuel
> pump,transmission) with non-essential relays. No
> change. Yesterday cleaned TB,and reset PCM. No
> change
> at all,except it holds steadier rpms at idle and
> just
> off idle.
>
> Still feels jerky under moderate to heavy
> load,almost
> like going over bumps. Today and yesterday it ran
> really bad,Tuesday it did well a lot of the day.
> (Same
> weather,no gas fill-up,etc.) The Dak ('03) has
> 52,000
> miles,so I haven't replaced the cap or rotor,but I
> did
> inspect them very closely when I did the plug wires
> in
> August,and cleaned a little oxidation off all the
> cap
> terminals and "resprung" the rotor tip for a little
> more pressure on the cap. No looseness or play in
> rotor at all. Checked fuel pressure (49 psi) and
> vacuum (let's skip that topic for a while - I think
> it's good).
>
> Like I said a while back,the transmission doesn't
> want
> to upshift unless I back off the gas,and starts off
> in
> second gear a lot,so my next plan is to change both
> governor sensor and solenoid,and change filters.
> Hard
> to believe the "missing" problem is transmission
> related though,especially since the truck's issue
> becomes severe with the air on,and since I smell the
> cat under hard acceleration constantly.
>
> Whew! Windy post.
>
> I don't know where to go from here. Losing courage.
> The only thing I can think to do is try to scope the
> crank sensor while driving and see if I can verify
> anything erratic with engine rpm. (The tach is too
> damped to see quick response.)
>
> Thanks!
>
> Steve P.
>
>
>
>
>
>
> --- "Bernd D. Ratsch" <bernd@dodgetrucks.org> wrote:
>
> >
> > A slight film of oil in the intake is normal (PCV
> > and crankcase breather
> > working). If you don't have any oil use or
> pinging
> > (detonation)...you're
> > fine.
> >
> > The 3.9L does have a rough idle - plenty of people
> > have complained about
> > it...it's just the nature of the beast (odd-fire
> > V6). However, what about
> > the plugs, wires, cap, and rotor? How old are
> they?
> >
> > - Bernd
> >
> > -----Original Message-----
> > From: Steve Preston
> [mailto:steveophonic@yahoo.com]
> > Sent: Wednesday, October 03, 2007 5:40 PM
> > To: dakota-truck@dakota-truck.net
> > Subject: Re: DML: RE: Idle
> >
> >
> > I do not know what IAC steps means. But I took my
> > throttle body off yesterday and cleaned it and the
> > IAC
> > hole and plunger,and I did the whole thing in like
> 6
> > steps! :) While I had it off,I shone a light down
> > into
> > the intake (this is on my 3.9 Workdak) and the
> sides
> > of the intake were oily. No puddles of oil on the
> > bottom,but it did have an oily film. Is that
> normal?
> > The truck doesn't ping,and doesn't use oil,but
> does
> > it
> > indicate an issue?
> >
> > The truck seems to idle better now,but it still
> > misses.
> >
> > Thanks!
> >
> > Steve P.
> >
> > --- "Bernd D. Ratsch" <bernd@dodgetrucks.org>
> wrote:
> >
> > >
> > > Nothing....just seen too many people try to
> adjust
> > > their IAC steps for
> > > "better throttle response" by either putting a
> > dummy
> > > IAC in the system or
> > > plugging the hole with their thumb and turing
> the
> > > throttle stop screw.
> > > Doesn't work and unless you know what the steps
> > > mean...don't do it. (Common
> > > thinking is that 80-steps is good and 0 is bad.
> > The
> > > IAC steps run anywhere
> > > from 10-70...anything above or below and you
> have
> > a
> > > problem.)
> > >
> > > - Bernd
> > >
> > > -----Original Message-----
> > > From: Azie L. Magnusson
> > [mailto:maggie11@mchsi.com]
> > > Sent: Tuesday, October 02, 2007 5:28 PM
> > > To: dakota-truck@dakota-truck.net
> > > Subject: DML: Idle
> > >
> > >
> > > Bernd writes: >>but that's definitely not the
> > > correct way
> > > at all and somewhat "redneck-ish". ;) <<
> > >
> > > And just what is wrong with being 'redneckish'
> > ???
> > >
> > > "Light travels faster than sound.
> > > That's why some people appear bright until you
> > hear
> > > them speak. "
> > >
> > > Azie
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
>
____________________________________________________________________________
> > ________
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> and
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> > FareChase.
>
=== message truncated ===
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