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post #1 of (permalink) Old 12-14-2000, 03:20 PM
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Oil Pressure Gauge

I've got a 90 YJ with the 4.2 and everything is great except my oil pressure gauge pegsout as soon as i turn the key on. I was thinking it was the sending unit but when I disconnect it the gauge still stays pegged.
Any ideas
Thanks
Justin

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post #2 of (permalink) Old 12-14-2000, 03:29 PM
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Re: Oil Pressure Gauge

Hmmm... I've got an '80 with the 4.2, and my oil gauge bounces all over the place, and the guage goes down to zero when I turn it off. -- I think that's more a sending unit problem than what you have. (I just haven't had time to put a new one in this week.)
Yours sounds more like the guage is stuck. We'll see what other opinions you get?
Good luck,

Jed Smith
'80 CJ7,258 w/ TR upgrade,1" shackles,
4" lift in the works
post #3 of (permalink) Old 12-14-2000, 03:41 PM
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Re: Oil Pressure Gauge

That was my thought but the gauge does go down to zero when I shut off the vehicle. Probably a ground problem

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post #4 of (permalink) Old 12-14-2000, 04:57 PM
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Re: Oil Pressure Gauge

Justin;
In my 90YJ, when my oil pressure sending unit went bad, it would peg the gauge as soon as I turn the key on also. Are you sure you're disconnecting the pressure sending unit? I don't mean to insult your intelligence, but the pressure sending unit is the small can with a single prong sticking out the top that is physically located between the distributor and the fire wall. I think what is confusing me is that you say that when you disconnect it, the gauge stays pegged. How can it stay pegged when you say it pegs as soon as you turn the key?
If the gauge is not mechanically stuck all the way to the right, then I would replace the gauge. If the gauge is moving thru full sweep (key on and off), then replace the sender.
BTW, when I replaced the sending unit, everything works great. Good luck.
-Gus-

90YJ 4.2L NV4500 456:1 33's Twin ARB's
post #5 of (permalink) Old 12-14-2000, 05:11 PM
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Re: Oil Pressure Gauge

that is what confused me. I pulled the wire off the unit and the gauge did stay pegged. I have a new sending unit so I might as well use it.

Thanks

post #6 of (permalink) Old 12-14-2000, 05:16 PM
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Re: Oil Pressure Gauge

Doh!! I hate when I read my (already sent) E-mails and it says something different than when I proof read it.[img]/wwwthreads_images/icons/crazy.gif[/img]
What I meant to say is.....

If the gauge is mechanically stuck all the way to the right, then I would replace the gauge. If the gauge is moving thru full sweep (key on and off), then replace the sender.

-Gus-

90YJ 4.2L NV4500 456:1 33's Twin ARB's
post #7 of (permalink) Old 12-14-2000, 05:23 PM
 
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Re: Oil Pressure Gauge

with the key on ground the wire to the sending unit to the block and see what happens.



OzarkJeep

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