My 5.9 was doing something similar (stumble wise) and I kept thinking
fuel used all sorts of cleaners (including Sea Foam), finally changed
the plugs, wires and distributor cap and runs like brand new!
Mike
At 07:35 PM 1/4/2009, Brian wrote:
>Might want to try running some seafoam through the motor instead of trying
>the fuel injector cleaner stuff in the fuel. Much quicker and interesting
>way to clean the engine.
>
>brian cropp
>-----Original Message-----
>From: owner-dakota-truck@bent.twistedbits.net
>[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Rick Suter
>Sent: Sunday, January 04, 2009 4:03 PM
>To: dakota-truck@dakota-truck.net
>Subject: DML: RE: RE: 5.2 vibration/rumble/groan or something like that...
>
>
>A few more tests.... rear driveshaft Ujoints are new. Front driveshaft
>was removed and it acts the same... I'm thinking it's gotta be the
>engine... I reproduced it in 4th and 3rd. Both in lockup and far from
>a downshift. In other words solidly in gear. Could not reproduce in
>2nd or 1st, but the request for power is far less in those gears.
>
>It stumbles at 1600-1700 RPMS with very light and exact throttle
>pressure. Its more a feel thing than an audible thing I'm finding. I
>added some Lucas snake oil to the fuel with hopes that leftover crap
>from a very leaky intake which I fixed might be the issue and that
>said SO might fix it. thoughts?
>
>thanks,
>
>Rick
>
>ps: Good news is that I'm pretty confident that it's not the tranny.
>
>
> >
> > ----------------------------------------------------------------------
> >
> > Date: Sat, 3 Jan 2009 10:01:45 -0500
> > From: "Rick Suter" <rick.suteriii@gmail.com>
> > Subject: DML: RE: 5.2 vibration/rumble/groan or something like that...
> >
> > Date: Fri, 2 Jan 2009 21:02:10 -0500
> > From: "Mike Sykes" <mikesykes@cox.net>
> > Subject: DML: RE: 5.2 vibration/rumble/groan or something like that...
> >
> >>>but I still have a nagging groan/vibration. It seems to be around TC
> >>>lockup, but I'm not convinced the two coincide. Most obvious around 60
> >>>MPH on the highway with light pressure on the gas... It's sort of a
> >>>groan/rumble with mild vibration. It seems to lessen as the truck warms
> >>>up. Worse in colder weather. Ideas?<<
> >
> >>>hhmmm... time for all the questions they're not gonna' ask you at the
> >>>shop: in the afore mentioned tuneup, did you change the trans fluid and
> >>>diff fluids?
> >
> > Trans yes, fluid and filter.... Diffs, no. Hadn't thought of it for
> > this issue, more as maintenance for the FLA trip. I'll try that next.
> >
> >>Does the vibration occur if you accelerate past 60 and are coasting
> >>under no throttle?
> >
> > Doesn't seem to. Seems more like light throttle pressure, barely
>accelerating.
> >
> >>Do your differentials ratchet for make noise when you take a tight turn?
> > I don't think so
> >
> >>Stock ride height?
> > No, has had 2" add-a-leafs in the rear since I've owned it at 16K miles.
> >
> >>When trying to pinpoint odd problems, I always tell people to start with
> >>the cheapest and easiest stuff, then move up as budget persists =)
> >>
> >>- - miggity
> >
> > thanks! Rick
> >
>
>
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