I had a similar problem with my 4.0 6cylinder 97TJ. Had mechanic put
mechanical gage on it and said pressure was "actualy" what it should be...
after putting my sensor back the problem went away. Im betting its your
sensor giving you trouble, wiggle it or even remove it and wipe it down and
replace it and see what ya get. If you remove it, let the engine completely
cool down, better for you, AND the aluminum threads you are turning.

Hope this helps!!


"hankfox" <hankfox@comcast.unnecessary.net> wrote in message
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com...
> I would appreciate opinions you all might have on my very strange oil
> pressure problem with my TJ
> 97TJ
> 2.5L
> 4-Speed
> A/C
>
> Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
> front disc pads, serpentine belt.
>
> Works fine on short hops. Oil gauge stays on 40 just like always.
> After I go about 10 miles, when I some to a stop the oil pressure
> drops little by little, but goes right up to 40 when I rev the engine.
> Eventually, it will fo down low enough to trigger the oil light but
> all I have to do is hit the gas and I'm fine.
>
> Oil level is ok - full, no frothl. No leaks anywhere. I don't know
> where the oil pump is so I can't see if it's loose but I'd suspect
> that if it was, there'd be oil everywhere. Valve cover cap is on
> tight.
>
> The only other new noises or symptoms is:
> - Then I start up, the new S belt screeches for about 3 seconds then
> quiets down
> - There seems to be some kind of a squeak occasionally when I turn,
> brake or start up fast. Not real loud but sharp sound. Just one squeak
> and it's over.
>
> Since it started right after the maintenance (not Daimler) it almost
> has to be related to something that was done. I've gone to the same
> shop for 20 years so I know it's not a rip off, but it almost has to
> be something that was done there. It almost sounds like there's some
> sort of malfunction with the filter that there isn't enough pressure
> unless the engine revs are up.
>
> I dunno what is going on, but it's the darndest thing I've ever come
> across.
>
> Any help would be greatly appreciated.
>
> Hank
>

 

I had a similar problem with my 4.0 6cylinder 97TJ. Had mechanic put
mechanical gage on it and said pressure was "actualy" what it should be...
after putting my sensor back the problem went away. Im betting its your
sensor giving you trouble, wiggle it or even remove it and wipe it down and
replace it and see what ya get. If you remove it, let the engine completely
cool down, better for you, AND the aluminum threads you are turning.

Hope this helps!!


"hankfox" <hankfox@comcast.unnecessary.net> wrote in message
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com...
> I would appreciate opinions you all might have on my very strange oil
> pressure problem with my TJ
> 97TJ
> 2.5L
> 4-Speed
> A/C
>
> Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
> front disc pads, serpentine belt.
>
> Works fine on short hops. Oil gauge stays on 40 just like always.
> After I go about 10 miles, when I some to a stop the oil pressure
> drops little by little, but goes right up to 40 when I rev the engine.
> Eventually, it will fo down low enough to trigger the oil light but
> all I have to do is hit the gas and I'm fine.
>
> Oil level is ok - full, no frothl. No leaks anywhere. I don't know
> where the oil pump is so I can't see if it's loose but I'd suspect
> that if it was, there'd be oil everywhere. Valve cover cap is on
> tight.
>
> The only other new noises or symptoms is:
> - Then I start up, the new S belt screeches for about 3 seconds then
> quiets down
> - There seems to be some kind of a squeak occasionally when I turn,
> brake or start up fast. Not real loud but sharp sound. Just one squeak
> and it's over.
>
> Since it started right after the maintenance (not Daimler) it almost
> has to be related to something that was done. I've gone to the same
> shop for 20 years so I know it's not a rip off, but it almost has to
> be something that was done there. It almost sounds like there's some
> sort of malfunction with the filter that there isn't enough pressure
> unless the engine revs are up.
>
> I dunno what is going on, but it's the darndest thing I've ever come
> across.
>
> Any help would be greatly appreciated.
>
> Hank
>

 

I had a similar problem with my 4.0 6cylinder 97TJ. Had mechanic put
mechanical gage on it and said pressure was "actualy" what it should be...
after putting my sensor back the problem went away. Im betting its your
sensor giving you trouble, wiggle it or even remove it and wipe it down and
replace it and see what ya get. If you remove it, let the engine completely
cool down, better for you, AND the aluminum threads you are turning.

Hope this helps!!


"hankfox" <hankfox@comcast.unnecessary.net> wrote in message
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com...
> I would appreciate opinions you all might have on my very strange oil
> pressure problem with my TJ
> 97TJ
> 2.5L
> 4-Speed
> A/C
>
> Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
> front disc pads, serpentine belt.
>
> Works fine on short hops. Oil gauge stays on 40 just like always.
> After I go about 10 miles, when I some to a stop the oil pressure
> drops little by little, but goes right up to 40 when I rev the engine.
> Eventually, it will fo down low enough to trigger the oil light but
> all I have to do is hit the gas and I'm fine.
>
> Oil level is ok - full, no frothl. No leaks anywhere. I don't know
> where the oil pump is so I can't see if it's loose but I'd suspect
> that if it was, there'd be oil everywhere. Valve cover cap is on
> tight.
>
> The only other new noises or symptoms is:
> - Then I start up, the new S belt screeches for about 3 seconds then
> quiets down
> - There seems to be some kind of a squeak occasionally when I turn,
> brake or start up fast. Not real loud but sharp sound. Just one squeak
> and it's over.
>
> Since it started right after the maintenance (not Daimler) it almost
> has to be related to something that was done. I've gone to the same
> shop for 20 years so I know it's not a rip off, but it almost has to
> be something that was done there. It almost sounds like there's some
> sort of malfunction with the filter that there isn't enough pressure
> unless the engine revs are up.
>
> I dunno what is going on, but it's the darndest thing I've ever come
> across.
>
> Any help would be greatly appreciated.
>
> Hank
>

 

Thanks to all of you who responded. From what you all have said, it's
about 99% the sender. I need to get a couple of hours of sunlight to
go take a look at it. I'll let you know how I make out.

Thanks again - Hank

On Fri, 16 Apr 2004 21:56:32 -0400, hankfox
<hankfox@comcast.unnecessary.net> wrote:

>I would appreciate opinions you all might have on my very strange oil
>pressure problem with my TJ
>97TJ
>2.5L
>4-Speed
>A/C
>
>Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
>front disc pads, serpentine belt.
>
>Works fine on short hops. Oil gauge stays on 40 just like always.
>After I go about 10 miles, when I some to a stop the oil pressure
>drops little by little, but goes right up to 40 when I rev the engine.
>Eventually, it will fo down low enough to trigger the oil light but
>all I have to do is hit the gas and I'm fine.
>
>Oil level is ok - full, no frothl. No leaks anywhere. I don't know
>where the oil pump is so I can't see if it's loose but I'd suspect
>that if it was, there'd be oil everywhere. Valve cover cap is on
>tight.
>
>The only other new noises or symptoms is:
>- Then I start up, the new S belt screeches for about 3 seconds then
>quiets down
>- There seems to be some kind of a squeak occasionally when I turn,
>brake or start up fast. Not real loud but sharp sound. Just one squeak
>and it's over.
>
>Since it started right after the maintenance (not Daimler) it almost
>has to be related to something that was done. I've gone to the same
>shop for 20 years so I know it's not a rip off, but it almost has to
>be something that was done there. It almost sounds like there's some
>sort of malfunction with the filter that there isn't enough pressure
>unless the engine revs are up.
>
>I dunno what is going on, but it's the darndest thing I've ever come
>across.
>
>Any help would be greatly appreciated.
>
>Hank

 

Thanks to all of you who responded. From what you all have said, it's
about 99% the sender. I need to get a couple of hours of sunlight to
go take a look at it. I'll let you know how I make out.

Thanks again - Hank

On Fri, 16 Apr 2004 21:56:32 -0400, hankfox
<hankfox@comcast.unnecessary.net> wrote:

>I would appreciate opinions you all might have on my very strange oil
>pressure problem with my TJ
>97TJ
>2.5L
>4-Speed
>A/C
>
>Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
>front disc pads, serpentine belt.
>
>Works fine on short hops. Oil gauge stays on 40 just like always.
>After I go about 10 miles, when I some to a stop the oil pressure
>drops little by little, but goes right up to 40 when I rev the engine.
>Eventually, it will fo down low enough to trigger the oil light but
>all I have to do is hit the gas and I'm fine.
>
>Oil level is ok - full, no frothl. No leaks anywhere. I don't know
>where the oil pump is so I can't see if it's loose but I'd suspect
>that if it was, there'd be oil everywhere. Valve cover cap is on
>tight.
>
>The only other new noises or symptoms is:
>- Then I start up, the new S belt screeches for about 3 seconds then
>quiets down
>- There seems to be some kind of a squeak occasionally when I turn,
>brake or start up fast. Not real loud but sharp sound. Just one squeak
>and it's over.
>
>Since it started right after the maintenance (not Daimler) it almost
>has to be related to something that was done. I've gone to the same
>shop for 20 years so I know it's not a rip off, but it almost has to
>be something that was done there. It almost sounds like there's some
>sort of malfunction with the filter that there isn't enough pressure
>unless the engine revs are up.
>
>I dunno what is going on, but it's the darndest thing I've ever come
>across.
>
>Any help would be greatly appreciated.
>
>Hank

 

Thanks to all of you who responded. From what you all have said, it's
about 99% the sender. I need to get a couple of hours of sunlight to
go take a look at it. I'll let you know how I make out.

Thanks again - Hank

On Fri, 16 Apr 2004 21:56:32 -0400, hankfox
<hankfox@comcast.unnecessary.net> wrote:

>I would appreciate opinions you all might have on my very strange oil
>pressure problem with my TJ
>97TJ
>2.5L
>4-Speed
>A/C
>
>Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
>front disc pads, serpentine belt.
>
>Works fine on short hops. Oil gauge stays on 40 just like always.
>After I go about 10 miles, when I some to a stop the oil pressure
>drops little by little, but goes right up to 40 when I rev the engine.
>Eventually, it will fo down low enough to trigger the oil light but
>all I have to do is hit the gas and I'm fine.
>
>Oil level is ok - full, no frothl. No leaks anywhere. I don't know
>where the oil pump is so I can't see if it's loose but I'd suspect
>that if it was, there'd be oil everywhere. Valve cover cap is on
>tight.
>
>The only other new noises or symptoms is:
>- Then I start up, the new S belt screeches for about 3 seconds then
>quiets down
>- There seems to be some kind of a squeak occasionally when I turn,
>brake or start up fast. Not real loud but sharp sound. Just one squeak
>and it's over.
>
>Since it started right after the maintenance (not Daimler) it almost
>has to be related to something that was done. I've gone to the same
>shop for 20 years so I know it's not a rip off, but it almost has to
>be something that was done there. It almost sounds like there's some
>sort of malfunction with the filter that there isn't enough pressure
>unless the engine revs are up.
>
>I dunno what is going on, but it's the darndest thing I've ever come
>across.
>
>Any help would be greatly appreciated.
>
>Hank

 

Thanks to all of you who responded. From what you all have said, it's
about 99% the sender. I need to get a couple of hours of sunlight to
go take a look at it. I'll let you know how I make out.

Thanks again - Hank

On Fri, 16 Apr 2004 21:56:32 -0400, hankfox
<hankfox@comcast.unnecessary.net> wrote:

>I would appreciate opinions you all might have on my very strange oil
>pressure problem with my TJ
>97TJ
>2.5L
>4-Speed
>A/C
>
>Just had oil change, filter (FRAM PH16), tail pipe/muffler, ac charge,
>front disc pads, serpentine belt.
>
>Works fine on short hops. Oil gauge stays on 40 just like always.
>After I go about 10 miles, when I some to a stop the oil pressure
>drops little by little, but goes right up to 40 when I rev the engine.
>Eventually, it will fo down low enough to trigger the oil light but
>all I have to do is hit the gas and I'm fine.
>
>Oil level is ok - full, no frothl. No leaks anywhere. I don't know
>where the oil pump is so I can't see if it's loose but I'd suspect
>that if it was, there'd be oil everywhere. Valve cover cap is on
>tight.
>
>The only other new noises or symptoms is:
>- Then I start up, the new S belt screeches for about 3 seconds then
>quiets down
>- There seems to be some kind of a squeak occasionally when I turn,
>brake or start up fast. Not real loud but sharp sound. Just one squeak
>and it's over.
>
>Since it started right after the maintenance (not Daimler) it almost
>has to be related to something that was done. I've gone to the same
>shop for 20 years so I know it's not a rip off, but it almost has to
>be something that was done there. It almost sounds like there's some
>sort of malfunction with the filter that there isn't enough pressure
>unless the engine revs are up.
>
>I dunno what is going on, but it's the darndest thing I've ever come
>across.
>
>Any help would be greatly appreciated.
>
>Hank

 

Fram filters have been known to cause wierd readings in Jeeps. I'd
suggest switching to a better quality filter (eg. purolator). I bet that
will fix the low readings.

hankfox <hankfox@comcast.unnecessary.net> wrote in
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com:

> Just had oil change, filter (FRAM PH16),

 

Fram filters have been known to cause wierd readings in Jeeps. I'd
suggest switching to a better quality filter (eg. purolator). I bet that
will fix the low readings.

hankfox <hankfox@comcast.unnecessary.net> wrote in
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com:

> Just had oil change, filter (FRAM PH16),

 

Fram filters have been known to cause wierd readings in Jeeps. I'd
suggest switching to a better quality filter (eg. purolator). I bet that
will fix the low readings.

hankfox <hankfox@comcast.unnecessary.net> wrote in
news:6o2180hdbogcfjtbn5v2b7a43d0apfrmas@4ax.com:

> Just had oil change, filter (FRAM PH16),