Gauges not working after rebuild?

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Aug 31, 2012 | 05:20 PM

#16

GRANDLICH

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From: east mesa, AZ

Year: 1993

Model: Cherokee

Engine: rebuilt 4.0

Quote:

Originally Posted by freegdr

is any other electrial going bonkers,try another battery.

Its only the temp gauge and the oil gauge jumps around, but thats only sometimes with the oil. I cleaned up the battery really good the other night? you think I need a new battery?

Aug 31, 2012 | 05:22 PM

#17

Turbo X_J

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Joined: Sep 2009

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From: ☼ Blackhole Sun

Year: My Jeep is a GMC

Quote:

Originally Posted by GRANDLICH

What do you mean sender? If your talking about the temp sending unit its the one that screws into the back on the bolck with the plug in on top. or do you mean my tester. the tester is a fluke has all diffrent modes.

There is a choice of either 1 or 2 + #3:
1.) Sending unit for the dash indicator light.
2.) Sending unit for the dash gauge.
3.) Coolant temperature sensor for the PCM.

Aug 31, 2012 | 05:22 PM

#18

freegdr

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Joined: Mar 2010

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From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Quote:

Originally Posted by GRANDLICH

Its only the temp gauge and the oil gauge jumps around, but thats only sometimes with the oil. I cleaned up the battery really good the other night? you think I need a new battery?

any thing electrial done while motor was out

Aug 31, 2012 | 05:25 PM

#19

freegdr

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Joined: Mar 2010

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From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Quote:

Originally Posted by GRANDLICH

So I searched and didnt see or find anything I though could be the problem. I have a 93 jeep cherokee, 4.0 engine, 4x4.

Last week we finished up the rebuild on my engine. Put the motor back in hooked everything up started it up and the temp was at 210 on the gauge, the oil gauge was tacked out to the right at 80. checked it with another guage at the sending unit and it was at 20 for oil pressure. The next morning started it up and the temp was out of wack also now sits right in the middle of the red now. Checked it with a laser temp reader at the thermostat housing and it said 204 degrees.

So I went and bought a new temp. sending unit and a oil pressure sending unit thinking this would solve my problem... well it didnt. So now im stuck and dont know what to check. the oil pressure guage seems to be right now most of the time but at times I see it sit at 40 and when I hit the gas move up from there but it always goes back down twords 18-20ish area.

If you guys have any ideas on what I could do it would be much appreciated!

original sensors were on motor at first start up?

Aug 31, 2012 | 05:34 PM

#20

GRANDLICH

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Joined: Feb 2011

Posts: 300

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From: east mesa, AZ

Year: 1993

Model: Cherokee

Engine: rebuilt 4.0

Quote:

Originally Posted by Turbo X_J

There is a choice of either 1 or 2 + #3:
1.) Sending unit for the dash indicator light.
2.) Sending unit for the dash gauge.
3.) Coolant temperature sensor for the PCM.

Oh okay I have number 2 then

Quote:

Originally Posted by freegdr

any thing electrial done while motor was out

nope

Quote:

Originally Posted by freegdr

original sensors were on motor at first start up?

Yes at the very first start up it read 210 on the guage, then the next morning when we started it up it was outta wack replaced temp sending unit and was still acting funny

Aug 31, 2012 | 06:04 PM

#21

freegdr

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Joined: Mar 2010

Posts: 47,923

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From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Quote:

Originally Posted by GRANDLICH

Oh okay I have number 2 then

nope

Yes at the very first start up it read 210 on the guage, then the next morning when we started it up it was outta wack replaced temp sending unit and was still acting funny

correct sensor bought i assume gauge and light look alike check part number on line...

Aug 31, 2012 | 06:06 PM

#22

freegdr

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Joined: Mar 2010

Posts: 47,923

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From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

sensor on back of head or thermo housing

Sep 1, 2012 | 06:27 AM

#23

10sec73

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Joined: May 2012

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Model: Cherokee

freegdr----the sensor is on the back of the head

just trying to help out GRANDLICH

Last edited by 10sec73; Sep 1, 2012 at 06:30 AM.

Sep 1, 2012 | 01:20 PM

#24

GRANDLICH

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Joined: Feb 2011

Posts: 300

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From: east mesa, AZ

Year: 1993

Model: Cherokee

Engine: rebuilt 4.0

Quote:

Originally Posted by freegdr

sensor on back of head or thermo housing

Yes the sensor on the back of head, and its the same part.

Sep 1, 2012 | 03:20 PM

#25

freegdr

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Joined: Mar 2010

Posts: 47,923

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From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Quote:

Originally Posted by GRANDLICH

Yes the sensor on the back of head, and its the same part.

they look just a like

Sep 1, 2012 | 07:25 PM

#26

GRANDLICH

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Seasoned Member

Joined: Feb 2011

Posts: 300

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From: east mesa, AZ

Year: 1993

Model: Cherokee

Engine: rebuilt 4.0

Quote:

Originally Posted by freegdr

they look just a like

yup

Sep 6, 2012 | 12:31 PM

#27

GRANDLICH

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Joined: Feb 2011

Posts: 300

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From: east mesa, AZ

Year: 1993

Model: Cherokee

Engine: rebuilt 4.0

well still trying to figure this out. I went around and tested anything in the engine bay that is a ground to something. found 3 maybe this will help??

-battery to engine block: .2-.3 ohms

-negative battery terminal to wall(3 inches long): .4 omhs

-NOW THE temp. sending unit(back of block): .9-1.0

these were all taken after the engine had cooled down quite a bit. I was thinking maybe replacing all these ground wires could help, but i did take all them off and cleaned the endes of each wire up. somw looked like there had some corrosion going on inside the the wire??