Drifting Tachometer

[Gus Rodriguez]

I have noticed recently that my tachometer is drifting from 600 to
around 1000 rpm at idle. It does this without any increase in engine
speed and it does it randomly. I have not driven it any significant
distance recently to notice if it does it on the road.

Any ideas? All information is appreciated.

Gus 89pt40 8v92t
Houston, Tx

[krminyl@...]

My tach is still acting up, after 2 yrs or so of erratic behavior. It all started after pressure washing my motor. I thought it was just a wet connector on the sending unit, so I cut/spliced the connector, and the problem still exists. I thought about replacing the sending unit, but they are kind of costly (a used one was something like $90??). Maybe try disconnecting the sending unit all together, and see if you still get the weird readings....if so, your sending unit is probably OK, and the issue is probably with either the gauge itself, or perhaps a bad ground.

I've kind of gotten used to the sometimes yes/sometimes no tachometer, and keep a fine tuned ear to the running motor. I'm interested to what you fix will be...keep us posted.

Kevin McKeown

Yorba Linda, CA

1986 38' PT (for sale)

---

Create a Home Theater Like the Pros. Watch the video on AOL Home.

[Donald Spithaler]

Hi Gus
My tachometer was doing that when I started it up to come south
in Dec. but when I got out on the road it started working right. It
hasn't given me any trouble since then. I hope it isn't getting ready
to quit working.
Don Spithaler
89 SP 36'
Butler, PA Still in Zephyrhills, FL

On Thu, Mar 27, 2008 at 12:08 AM, Gus Rodriguez wrote:
>
>
>

>
>
>
> I have noticed recently that my tachometer is drifting from 600 to
> around 1000 rpm at idle. It does this without any increase in engine
> speed and it does it randomly. I have not driven it any significant
> distance recently to notice if it does it on the road.
>
> Any ideas? All information is appreciated.
>
> Gus 89pt40 8v92t
> Houston, Tx
>
>

[robert nloomas]

--- In WanderlodgeForum@yahoogroups.com, krminyl@... wrote:
Mine does the same thing.What I do unscrew the wiring cap off
the sending unit and pack it with grease that takes care of the
problem for a few months.
Bob Loomas 1985 PT 36
>
> My tach is still acting up, after 2 yrs or so of erratic
behavior. It all
> started after pressure washing my motor. I thought it was just a
wet
> connector on the sending unit, so I cut/spliced the connector, and
the problem still
> exists. I thought about replacing the sending unit, but they are
kind of
> costly (a used one was something like $90??). Maybe try
disconnecting the
> sending unit all together, and see if you still get the weird
readings....if so,
> your sending unit is probably OK, and the issue is probably with
either the
> gauge itself, or perhaps a bad ground.
>
> I've kind of gotten used to the sometimes yes/sometimes no
tachometer, and
> keep a fine tuned ear to the running motor. I'm interested to
what you fix
> will be...keep us posted.
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT (for sale)
>
>
>
> **************Create a Home Theater Like the Pros. Watch the video
on AOL
> Home.
> (http://home.aol.com/diy/home-improvement-eric-stromer?
video=15&ncid=aolhom00030000000001)
>