hi group
i have a 91 yj w/ I6 and the following probs:

the needle in the water temp gauge sometimes would for no apparent reason
jump to the far right (highest reading) as far as it can go and stay
there --
light tapping of my finger against the gauge brings the needle where it
should be --
near the middle of the scale

the oil pressure gauge has the same problem except that no amount of tapping
on the gauge would bring the needle to where it should be -- showing
variations
in oil pressure. the needle stays at highest reading at all times.

what's wrong? can someone help?
many thanks!

yjer

 

The high oil pressure reading is usually the sender unit mounted on the
engine block. Runs about $25 at NAPA or other serious car parts place.
Do not use the sender units in the blister packs next to the add on
gauges, those have a different callibration.

The temp gauge problem sounds like a dirty short in the flex wiring
behind the gauge. (At least that's where I'd start) Remove the foam
covers, remove the gauge package, clean things up back there. It tends
to get really dusty if the Jeep has been driven on back roads.

cheers.

Peter D. wrote:
> hi group
> i have a 91 yj w/ I6 and the following probs:
>
> the needle in the water temp gauge sometimes would for no apparent reason
> jump to the far right (highest reading) as far as it can go and stay
> there --
> light tapping of my finger against the gauge brings the needle where it
> should be --
> near the middle of the scale
>
> the oil pressure gauge has the same problem except that no amount of tapping
> on the gauge would bring the needle to where it should be -- showing
> variations
> in oil pressure. the needle stays at highest reading at all times.
>
> what's wrong? can someone help?
> many thanks!
>
> yjer
>
>
>

 

The high oil pressure reading is usually the sender unit mounted on the
engine block. Runs about $25 at NAPA or other serious car parts place.
Do not use the sender units in the blister packs next to the add on
gauges, those have a different callibration.

The temp gauge problem sounds like a dirty short in the flex wiring
behind the gauge. (At least that's where I'd start) Remove the foam
covers, remove the gauge package, clean things up back there. It tends
to get really dusty if the Jeep has been driven on back roads.

cheers.

Peter D. wrote:
> hi group
> i have a 91 yj w/ I6 and the following probs:
>
> the needle in the water temp gauge sometimes would for no apparent reason
> jump to the far right (highest reading) as far as it can go and stay
> there --
> light tapping of my finger against the gauge brings the needle where it
> should be --
> near the middle of the scale
>
> the oil pressure gauge has the same problem except that no amount of tapping
> on the gauge would bring the needle to where it should be -- showing
> variations
> in oil pressure. the needle stays at highest reading at all times.
>
> what's wrong? can someone help?
> many thanks!
>
> yjer
>
>
>

 

The high oil pressure reading is usually the sender unit mounted on the
engine block. Runs about $25 at NAPA or other serious car parts place.
Do not use the sender units in the blister packs next to the add on
gauges, those have a different callibration.

The temp gauge problem sounds like a dirty short in the flex wiring
behind the gauge. (At least that's where I'd start) Remove the foam
covers, remove the gauge package, clean things up back there. It tends
to get really dusty if the Jeep has been driven on back roads.

cheers.

Peter D. wrote:
> hi group
> i have a 91 yj w/ I6 and the following probs:
>
> the needle in the water temp gauge sometimes would for no apparent reason
> jump to the far right (highest reading) as far as it can go and stay
> there --
> light tapping of my finger against the gauge brings the needle where it
> should be --
> near the middle of the scale
>
> the oil pressure gauge has the same problem except that no amount of tapping
> on the gauge would bring the needle to where it should be -- showing
> variations
> in oil pressure. the needle stays at highest reading at all times.
>
> what's wrong? can someone help?
> many thanks!
>
> yjer
>
>
>

 

The high oil pressure reading is usually the sender unit mounted on the
engine block. Runs about $25 at NAPA or other serious car parts place.
Do not use the sender units in the blister packs next to the add on
gauges, those have a different callibration.

The temp gauge problem sounds like a dirty short in the flex wiring
behind the gauge. (At least that's where I'd start) Remove the foam
covers, remove the gauge package, clean things up back there. It tends
to get really dusty if the Jeep has been driven on back roads.

cheers.

Peter D. wrote:
> hi group
> i have a 91 yj w/ I6 and the following probs:
>
> the needle in the water temp gauge sometimes would for no apparent reason
> jump to the far right (highest reading) as far as it can go and stay
> there --
> light tapping of my finger against the gauge brings the needle where it
> should be --
> near the middle of the scale
>
> the oil pressure gauge has the same problem except that no amount of tapping
> on the gauge would bring the needle to where it should be -- showing
> variations
> in oil pressure. the needle stays at highest reading at all times.
>
> what's wrong? can someone help?
> many thanks!
>
> yjer
>
>
>