97 wrangler oil pressure...
 

I have seen a lot of posts here about oil pressure senders failing on 97's,
but I want to just see if this fits the profile..

My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure at
idle. The pressure swings with engine speed, to about 45-50 lbs at highway
speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30 lbs..
Even though the manual states this is ok, it has never changed this much
before. (usually stays over 40lbs even at idle when hot.) This was sudden.
No change in the sound of the engine. Changed oil several weeks ago, and it
is still up to 'full'. My grand cherokee's sender went out last winter
(also a 97), but it behaved very differently (the pressure would just
randomly drop and rise..) I plan to replace the sender as soon as I can get
one, but I ask if anyone has any other ideas...

cal

Re: 97 wrangler oil pressure...
 

On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
wrote:

> I have seen a lot of posts here about oil pressure senders failing on 97's,
> but I want to just see if this fits the profile..
>
> My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure at
> idle. The pressure swings with engine speed, to about 45-50 lbs at highway
> speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30 lbs..
> Even though the manual states this is ok, it has never changed this much
> before. (usually stays over 40lbs even at idle when hot.) This was sudden.
> No change in the sound of the engine. Changed oil several weeks ago, and it
> is still up to 'full'. My grand cherokee's sender went out last winter
> (also a 97), but it behaved very differently (the pressure would just
> randomly drop and rise..) I plan to replace the sender as soon as I can get
> one, but I ask if anyone has any other ideas...

Sounds pretty normal once it is warmed up completely. I'd expect the
idle pressure to start off higher then decrese to to 20 psi or so. I
did have to swap out an oil pump last summer because the highway
pressure dropped 10-15 PSI during the course of a 200 mile trip
(verified with a mechanical guage) but the pressure (hot) should
pretty much track the RPM with no rapid changes at any particular RPM.
Mine does drop a bit lower with really high OAT on a long, sustained
run but even I get a tad limp when the air temp pushes 100 F.

--
Will Honea

Re: 97 wrangler oil pressure...
 

On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
wrote:

> I have seen a lot of posts here about oil pressure senders failing on 97's,
> but I want to just see if this fits the profile..
>
> My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure at
> idle. The pressure swings with engine speed, to about 45-50 lbs at highway
> speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30 lbs..
> Even though the manual states this is ok, it has never changed this much
> before. (usually stays over 40lbs even at idle when hot.) This was sudden.
> No change in the sound of the engine. Changed oil several weeks ago, and it
> is still up to 'full'. My grand cherokee's sender went out last winter
> (also a 97), but it behaved very differently (the pressure would just
> randomly drop and rise..) I plan to replace the sender as soon as I can get
> one, but I ask if anyone has any other ideas...

Sounds pretty normal once it is warmed up completely. I'd expect the
idle pressure to start off higher then decrese to to 20 psi or so. I
did have to swap out an oil pump last summer because the highway
pressure dropped 10-15 PSI during the course of a 200 mile trip
(verified with a mechanical guage) but the pressure (hot) should
pretty much track the RPM with no rapid changes at any particular RPM.
Mine does drop a bit lower with really high OAT on a long, sustained
run but even I get a tad limp when the air temp pushes 100 F.

--
Will Honea

Re: 97 wrangler oil pressure...
 

On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
wrote:

> I have seen a lot of posts here about oil pressure senders failing on 97's,
> but I want to just see if this fits the profile..
>
> My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure at
> idle. The pressure swings with engine speed, to about 45-50 lbs at highway
> speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30 lbs..
> Even though the manual states this is ok, it has never changed this much
> before. (usually stays over 40lbs even at idle when hot.) This was sudden.
> No change in the sound of the engine. Changed oil several weeks ago, and it
> is still up to 'full'. My grand cherokee's sender went out last winter
> (also a 97), but it behaved very differently (the pressure would just
> randomly drop and rise..) I plan to replace the sender as soon as I can get
> one, but I ask if anyone has any other ideas...

Sounds pretty normal once it is warmed up completely. I'd expect the
idle pressure to start off higher then decrese to to 20 psi or so. I
did have to swap out an oil pump last summer because the highway
pressure dropped 10-15 PSI during the course of a 200 mile trip
(verified with a mechanical guage) but the pressure (hot) should
pretty much track the RPM with no rapid changes at any particular RPM.
Mine does drop a bit lower with really high OAT on a long, sustained
run but even I get a tad limp when the air temp pushes 100 F.

--
Will Honea

Re: 97 wrangler oil pressure...
 

On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
wrote:

> I have seen a lot of posts here about oil pressure senders failing on 97's,
> but I want to just see if this fits the profile..
>
> My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure at
> idle. The pressure swings with engine speed, to about 45-50 lbs at highway
> speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30 lbs..
> Even though the manual states this is ok, it has never changed this much
> before. (usually stays over 40lbs even at idle when hot.) This was sudden.
> No change in the sound of the engine. Changed oil several weeks ago, and it
> is still up to 'full'. My grand cherokee's sender went out last winter
> (also a 97), but it behaved very differently (the pressure would just
> randomly drop and rise..) I plan to replace the sender as soon as I can get
> one, but I ask if anyone has any other ideas...

Sounds pretty normal once it is warmed up completely. I'd expect the
idle pressure to start off higher then decrese to to 20 psi or so. I
did have to swap out an oil pump last summer because the highway
pressure dropped 10-15 PSI during the course of a 200 mile trip
(verified with a mechanical guage) but the pressure (hot) should
pretty much track the RPM with no rapid changes at any particular RPM.
Mine does drop a bit lower with really high OAT on a long, sustained
run but even I get a tad limp when the air temp pushes 100 F.

--
Will Honea

Re: 97 wrangler oil pressure...
 

I was out on a trail with my '97 TJ and as I was sitting idling all of a
sudden mine dropped to almost nothing and the 'check gauges' light came on.
I rev'd it a couple times and it went back to almost normal and when I
finally got back to pavement it was pretty much business as usual. It has
never happened again either. I wonder what happened in my case? Something
momentarily obstructed the pickup tube or the pump got something stuck in
it?

Shawn


"Will Honea" <hwj25(remove this)@qwest.net> wrote in message
news:JxX2tWiP5BNp-pn2-t55oZpnWQdhF@anon.none.net...
> On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
> wrote:
>
> > I have seen a lot of posts here about oil pressure senders failing on
97's,
> > but I want to just see if this fits the profile..
> >
> > My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure
at
> > idle. The pressure swings with engine speed, to about 45-50 lbs at
highway
> > speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30
lbs..
> > Even though the manual states this is ok, it has never changed this much
> > before. (usually stays over 40lbs even at idle when hot.) This was
sudden.
> > No change in the sound of the engine. Changed oil several weeks ago,
and it
> > is still up to 'full'. My grand cherokee's sender went out last winter
> > (also a 97), but it behaved very differently (the pressure would just
> > randomly drop and rise..) I plan to replace the sender as soon as I can
get
> > one, but I ask if anyone has any other ideas...
>
> Sounds pretty normal once it is warmed up completely. I'd expect the
> idle pressure to start off higher then decrese to to 20 psi or so. I
> did have to swap out an oil pump last summer because the highway
> pressure dropped 10-15 PSI during the course of a 200 mile trip
> (verified with a mechanical guage) but the pressure (hot) should
> pretty much track the RPM with no rapid changes at any particular RPM.
> Mine does drop a bit lower with really high OAT on a long, sustained
> run but even I get a tad limp when the air temp pushes 100 F.
>
> --
> Will Honea

Re: 97 wrangler oil pressure...
 

I was out on a trail with my '97 TJ and as I was sitting idling all of a
sudden mine dropped to almost nothing and the 'check gauges' light came on.
I rev'd it a couple times and it went back to almost normal and when I
finally got back to pavement it was pretty much business as usual. It has
never happened again either. I wonder what happened in my case? Something
momentarily obstructed the pickup tube or the pump got something stuck in
it?

Shawn


"Will Honea" <hwj25(remove this)@qwest.net> wrote in message
news:JxX2tWiP5BNp-pn2-t55oZpnWQdhF@anon.none.net...
> On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
> wrote:
>
> > I have seen a lot of posts here about oil pressure senders failing on
97's,
> > but I want to just see if this fits the profile..
> >
> > My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure
at
> > idle. The pressure swings with engine speed, to about 45-50 lbs at
highway
> > speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30
lbs..
> > Even though the manual states this is ok, it has never changed this much
> > before. (usually stays over 40lbs even at idle when hot.) This was
sudden.
> > No change in the sound of the engine. Changed oil several weeks ago,
and it
> > is still up to 'full'. My grand cherokee's sender went out last winter
> > (also a 97), but it behaved very differently (the pressure would just
> > randomly drop and rise..) I plan to replace the sender as soon as I can
get
> > one, but I ask if anyone has any other ideas...
>
> Sounds pretty normal once it is warmed up completely. I'd expect the
> idle pressure to start off higher then decrese to to 20 psi or so. I
> did have to swap out an oil pump last summer because the highway
> pressure dropped 10-15 PSI during the course of a 200 mile trip
> (verified with a mechanical guage) but the pressure (hot) should
> pretty much track the RPM with no rapid changes at any particular RPM.
> Mine does drop a bit lower with really high OAT on a long, sustained
> run but even I get a tad limp when the air temp pushes 100 F.
>
> --
> Will Honea

Re: 97 wrangler oil pressure...
 

I was out on a trail with my '97 TJ and as I was sitting idling all of a
sudden mine dropped to almost nothing and the 'check gauges' light came on.
I rev'd it a couple times and it went back to almost normal and when I
finally got back to pavement it was pretty much business as usual. It has
never happened again either. I wonder what happened in my case? Something
momentarily obstructed the pickup tube or the pump got something stuck in
it?

Shawn


"Will Honea" <hwj25(remove this)@qwest.net> wrote in message
news:JxX2tWiP5BNp-pn2-t55oZpnWQdhF@anon.none.net...
> On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
> wrote:
>
> > I have seen a lot of posts here about oil pressure senders failing on
97's,
> > but I want to just see if this fits the profile..
> >
> > My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure
at
> > idle. The pressure swings with engine speed, to about 45-50 lbs at
highway
> > speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30
lbs..
> > Even though the manual states this is ok, it has never changed this much
> > before. (usually stays over 40lbs even at idle when hot.) This was
sudden.
> > No change in the sound of the engine. Changed oil several weeks ago,
and it
> > is still up to 'full'. My grand cherokee's sender went out last winter
> > (also a 97), but it behaved very differently (the pressure would just
> > randomly drop and rise..) I plan to replace the sender as soon as I can
get
> > one, but I ask if anyone has any other ideas...
>
> Sounds pretty normal once it is warmed up completely. I'd expect the
> idle pressure to start off higher then decrese to to 20 psi or so. I
> did have to swap out an oil pump last summer because the highway
> pressure dropped 10-15 PSI during the course of a 200 mile trip
> (verified with a mechanical guage) but the pressure (hot) should
> pretty much track the RPM with no rapid changes at any particular RPM.
> Mine does drop a bit lower with really high OAT on a long, sustained
> run but even I get a tad limp when the air temp pushes 100 F.
>
> --
> Will Honea

Re: 97 wrangler oil pressure...
 

I was out on a trail with my '97 TJ and as I was sitting idling all of a
sudden mine dropped to almost nothing and the 'check gauges' light came on.
I rev'd it a couple times and it went back to almost normal and when I
finally got back to pavement it was pretty much business as usual. It has
never happened again either. I wonder what happened in my case? Something
momentarily obstructed the pickup tube or the pump got something stuck in
it?

Shawn


"Will Honea" <hwj25(remove this)@qwest.net> wrote in message
news:JxX2tWiP5BNp-pn2-t55oZpnWQdhF@anon.none.net...
> On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
> wrote:
>
> > I have seen a lot of posts here about oil pressure senders failing on
97's,
> > but I want to just see if this fits the profile..
> >
> > My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure
at
> > idle. The pressure swings with engine speed, to about 45-50 lbs at
highway
> > speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30
lbs..
> > Even though the manual states this is ok, it has never changed this much
> > before. (usually stays over 40lbs even at idle when hot.) This was
sudden.
> > No change in the sound of the engine. Changed oil several weeks ago,
and it
> > is still up to 'full'. My grand cherokee's sender went out last winter
> > (also a 97), but it behaved very differently (the pressure would just
> > randomly drop and rise..) I plan to replace the sender as soon as I can
get
> > one, but I ask if anyone has any other ideas...
>
> Sounds pretty normal once it is warmed up completely. I'd expect the
> idle pressure to start off higher then decrese to to 20 psi or so. I
> did have to swap out an oil pump last summer because the highway
> pressure dropped 10-15 PSI during the course of a 200 mile trip
> (verified with a mechanical guage) but the pressure (hot) should
> pretty much track the RPM with no rapid changes at any particular RPM.
> Mine does drop a bit lower with really high OAT on a long, sustained
> run but even I get a tad limp when the air temp pushes 100 F.
>
> --
> Will Honea

Re: 97 wrangler oil pressure...
 

I had my 88 MJ 4.0 give me a flicker last summer when I shut it down
on a steep downslope (felt like it was standing on it's nose, couldn't
close the doors if I wanted to) then started it back up a while later
after we moved the log that was in the way (no, there was no way to
climb over it <g>). I figured that the oil had simply drained to the
front of the pan and it gulped air as I rocked it. Shouldn't do that
on a (near) level, tho. Were you low on oil? Did the idle droop
especially low maybe?

On Mon, 7 Jun 2004 17:48:02 UTC "Endo" <me@oh.my> wrote:

> I was out on a trail with my '97 TJ and as I was sitting idling all of a
> sudden mine dropped to almost nothing and the 'check gauges' light came on.
> I rev'd it a couple times and it went back to almost normal and when I
> finally got back to pavement it was pretty much business as usual. It has
> never happened again either. I wonder what happened in my case? Something
> momentarily obstructed the pickup tube or the pump got something stuck in
> it?
>
> Shawn
>
>
> "Will Honea" <hwj25(remove this)@qwest.net> wrote in message
> news:JxX2tWiP5BNp-pn2-t55oZpnWQdhF@anon.none.net...
> > On Mon, 7 Jun 2004 04:00:57 UTC "Cal" <codom1*IHATESPAM*@triad.rr.com>
> > wrote:
> >
> > > I have seen a lot of posts here about oil pressure senders failing on
> 97's,
> > > but I want to just see if this fits the profile..
> > >
> > > My sons wrangler, 4cyl, suddenly started showing about 20 lbs pressure
> at
> > > idle. The pressure swings with engine speed, to about 45-50 lbs at
> highway
> > > speeds (1500 to 2500 rpm) and will drop quickly again at idle to 20-30
> lbs..
> > > Even though the manual states this is ok, it has never changed this much
> > > before. (usually stays over 40lbs even at idle when hot.) This was
> sudden.
> > > No change in the sound of the engine. Changed oil several weeks ago,
> and it
> > > is still up to 'full'. My grand cherokee's sender went out last winter
> > > (also a 97), but it behaved very differently (the pressure would just
> > > randomly drop and rise..) I plan to replace the sender as soon as I can
> get
> > > one, but I ask if anyone has any other ideas...
> >
> > Sounds pretty normal once it is warmed up completely. I'd expect the
> > idle pressure to start off higher then decrese to to 20 psi or so. I
> > did have to swap out an oil pump last summer because the highway
> > pressure dropped 10-15 PSI during the course of a 200 mile trip
> > (verified with a mechanical guage) but the pressure (hot) should
> > pretty much track the RPM with no rapid changes at any particular RPM.
> > Mine does drop a bit lower with really high OAT on a long, sustained
> > run but even I get a tad limp when the air temp pushes 100 F.
> >
> > --
> > Will Honea
>
>


--
Will Honea