TJ 4.0L oil pressure rises real slow
08-12-2003, 10:09 PM
#1
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TJ 4.0L oil pressure rises real slow
Hi all,
I have a 2001 TJ with the 4.0L straight six engine. Runs great. It has
54500 miles on it. I noticed the last 5000 miles or so that the oil
pressure builds up slower and slower when it is started cold. About every
second time it starts, the little dash beeper to check the guages comes on
because the oil pressure is not up yet. Once the pressure is up, it stays
between 40-60 psi. Same place it has been since I bought the thing. It
never drops. It just takes probably 10-15 seconds to build up, from a cold
or cool start.
Anybody had this same experience and know if this is typical or what this
might be?? I'm running Valvoline full synthetic 10W30. This last oil
change I put a quart of that Marvelous Mystery oil treatment in it (Red
bottle).
I would have thought if it was an oil delivery problem, like the pump or
crank bearings, the pressure would be down from normal also, but it's not.
Real weird.
Any advice would be great!
Mike
I have a 2001 TJ with the 4.0L straight six engine. Runs great. It has
54500 miles on it. I noticed the last 5000 miles or so that the oil
pressure builds up slower and slower when it is started cold. About every
second time it starts, the little dash beeper to check the guages comes on
because the oil pressure is not up yet. Once the pressure is up, it stays
between 40-60 psi. Same place it has been since I bought the thing. It
never drops. It just takes probably 10-15 seconds to build up, from a cold
or cool start.
Anybody had this same experience and know if this is typical or what this
might be?? I'm running Valvoline full synthetic 10W30. This last oil
change I put a quart of that Marvelous Mystery oil treatment in it (Red
bottle).
I would have thought if it was an oil delivery problem, like the pump or
crank bearings, the pressure would be down from normal also, but it's not.
Real weird.
Any advice would be great!
Mike
08-12-2003, 10:17 PM
#2
Guest
Posts: n/a
Re: TJ 4.0L oil pressure rises real slow
In article <vjj7fks4tbn25a@corp.supernews.com>,
mike <mikedebjess@hotmail.com> wrote:
>Hi all,
Hi.
>I have a 2001 TJ with the 4.0L straight six engine. Runs great. It has
>54500 miles on it. I noticed the last 5000 miles or so that the oil
>pressure builds up slower and slower when it is started cold. About every
>second time it starts, the little dash beeper to check the guages comes on
>because the oil pressure is not up yet. Once the pressure is up, it stays
>between 40-60 psi. Same place it has been since I bought the thing. It
>never drops. It just takes probably 10-15 seconds to build up, from a cold
>or cool start.
Check your cold start oil pressure with a mechanical gauge.
>Anybody had this same experience and know if this is typical or what this
>might be?? I'm running Valvoline full synthetic 10W30. This last oil
>change I put a quart of that Marvelous Mystery oil treatment in it (Red
>bottle).
That should be okay. The mystery oil is a waste IMHO, you are using
synthetic oil which doesn't need any treatment. Besides, you only have 54500
and that's not even broke in yet. I have 189500 on my YJ and it's not
broke in yet. :-) Well maybe just broke in...
>I would have thought if it was an oil delivery problem, like the pump or
>crank bearings, the pressure would be down from normal also, but it's not.
>Real weird.
The mechanical guage will show the real pressure. It sounds like your oil
pressure sensor is starting to go bad.
--
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mike <mikedebjess@hotmail.com> wrote:
>Hi all,
Hi.
>I have a 2001 TJ with the 4.0L straight six engine. Runs great. It has
>54500 miles on it. I noticed the last 5000 miles or so that the oil
>pressure builds up slower and slower when it is started cold. About every
>second time it starts, the little dash beeper to check the guages comes on
>because the oil pressure is not up yet. Once the pressure is up, it stays
>between 40-60 psi. Same place it has been since I bought the thing. It
>never drops. It just takes probably 10-15 seconds to build up, from a cold
>or cool start.
Check your cold start oil pressure with a mechanical gauge.
>Anybody had this same experience and know if this is typical or what this
>might be?? I'm running Valvoline full synthetic 10W30. This last oil
>change I put a quart of that Marvelous Mystery oil treatment in it (Red
>bottle).
That should be okay. The mystery oil is a waste IMHO, you are using
synthetic oil which doesn't need any treatment. Besides, you only have 54500
and that's not even broke in yet. I have 189500 on my YJ and it's not
broke in yet. :-) Well maybe just broke in...
>I would have thought if it was an oil delivery problem, like the pump or
>crank bearings, the pressure would be down from normal also, but it's not.
>Real weird.
The mechanical guage will show the real pressure. It sounds like your oil
pressure sensor is starting to go bad.
--
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