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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