Very strange 97TJ Oil pressure problem
 

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

Re: Very strange 97TJ Oil pressure problem
 

hankfox did pass the time by typing:
> 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 pump is in your engine under the distributor in the engine block
above the oil pan. Your not going to see it unless you tear the pan
off. :)

Remove, clean, and reinstall the sensor wire leading to the
oil pressure sender (should be screwed into the oil boss right
by your filter) Least that's where it is on the I6. YMMV

The only sure way to determine you oil pressure is with a mechanical
gauge screwed into that hole. Check the connection first.

40 seems a little low to me. The ZJ runs about 60psi depending on
temerature. But I'm not familiar with the I4

That chirp on acceleration is telling me your belt needs to be
readjusted. New belts stretch after they warm up.

--
DougW

Re: Very strange 97TJ Oil pressure problem
 

hankfox did pass the time by typing:
> 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 pump is in your engine under the distributor in the engine block
above the oil pan. Your not going to see it unless you tear the pan
off. :)

Remove, clean, and reinstall the sensor wire leading to the
oil pressure sender (should be screwed into the oil boss right
by your filter) Least that's where it is on the I6. YMMV

The only sure way to determine you oil pressure is with a mechanical
gauge screwed into that hole. Check the connection first.

40 seems a little low to me. The ZJ runs about 60psi depending on
temerature. But I'm not familiar with the I4

That chirp on acceleration is telling me your belt needs to be
readjusted. New belts stretch after they warm up.

--
DougW

Re: Very strange 97TJ Oil pressure problem
 

hankfox did pass the time by typing:
> 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 pump is in your engine under the distributor in the engine block
above the oil pan. Your not going to see it unless you tear the pan
off. :)

Remove, clean, and reinstall the sensor wire leading to the
oil pressure sender (should be screwed into the oil boss right
by your filter) Least that's where it is on the I6. YMMV

The only sure way to determine you oil pressure is with a mechanical
gauge screwed into that hole. Check the connection first.

40 seems a little low to me. The ZJ runs about 60psi depending on
temerature. But I'm not familiar with the I4

That chirp on acceleration is telling me your belt needs to be
readjusted. New belts stretch after they warm up.

--
DougW

Re: Very strange 97TJ Oil pressure problem
 

hankfox did pass the time by typing:
> 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 pump is in your engine under the distributor in the engine block
above the oil pan. Your not going to see it unless you tear the pan
off. :)

Remove, clean, and reinstall the sensor wire leading to the
oil pressure sender (should be screwed into the oil boss right
by your filter) Least that's where it is on the I6. YMMV

The only sure way to determine you oil pressure is with a mechanical
gauge screwed into that hole. Check the connection first.

40 seems a little low to me. The ZJ runs about 60psi depending on
temerature. But I'm not familiar with the I4

That chirp on acceleration is telling me your belt needs to be
readjusted. New belts stretch after they warm up.

--
DougW

Re: Very strange 97TJ Oil pressure problem
 

Sending unit maybe? Usually I've seen it either work, or not work, not
that kind of random stuff you're talking about. But it's right by the
oil filter, and easy to bang or disconnect when doing an oil change
(happened to my buddy with his '00 anyway). Just a thought.

Dave
http://mysite.verizon.net/res0p2es/david/index.htm

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

Re: Very strange 97TJ Oil pressure problem
 

Sending unit maybe? Usually I've seen it either work, or not work, not
that kind of random stuff you're talking about. But it's right by the
oil filter, and easy to bang or disconnect when doing an oil change
(happened to my buddy with his '00 anyway). Just a thought.

Dave
http://mysite.verizon.net/res0p2es/david/index.htm

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

Re: Very strange 97TJ Oil pressure problem
 

Sending unit maybe? Usually I've seen it either work, or not work, not
that kind of random stuff you're talking about. But it's right by the
oil filter, and easy to bang or disconnect when doing an oil change
(happened to my buddy with his '00 anyway). Just a thought.

Dave
http://mysite.verizon.net/res0p2es/david/index.htm

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

Re: Very strange 97TJ Oil pressure problem
 

Sending unit maybe? Usually I've seen it either work, or not work, not
that kind of random stuff you're talking about. But it's right by the
oil filter, and easy to bang or disconnect when doing an oil change
(happened to my buddy with his '00 anyway). Just a thought.

Dave
http://mysite.verizon.net/res0p2es/david/index.htm

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

Re: Very strange 97TJ Oil pressure problem
 

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
>