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Oil Pressure Gauge PEGGED!?!?

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Old May 24, 2006 | 03:15 PM
  #1  
CamarosRUS's Avatar
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Oil Pressure Gauge PEGGED!?!?

I went to prime the oil pump again after the new motor been sitting a while and hasn't competly broken in yet. I pulled the passenger side valve cover and I cannot see any oil squirting anywhere in there??!!
Went to look at the aguge and as soon as I hit the key it went to as far rigth as it can go, well beyond 60 PSI. When it was first primed a week or so ago everything was fine. It read 30-45 PSI depending on the drills RPM.

Anyone have any ideas whats up??
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Old May 24, 2006 | 03:21 PM
  #2  
CamarosRUS's Avatar
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
BTW the motor is at 11* BDTC on #1 if it matters
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Old May 24, 2006 | 03:43 PM
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Pegged = wire disconnected or broken, sending unit open
Zero = wire or sending unit shorted

Basically the same discipline as an idiot light sender; short to ground = low pressure - light on, open = high pressure = light off.

Alligator-clip-lead the wire to ground, see if the gauge goes to zero. If it does, the gauge and wiring are good, and you need a sender.
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Old May 24, 2006 | 03:50 PM
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Stekman's Avatar
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
I've said it before, I'll say it again: mechanical gauge.
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Old May 24, 2006 | 04:07 PM
  #5  
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Well, something is defenitly wring (of course...look who it is). The gauge when I hit the kill switch a couple times wasn't pegged anymore but it looked like it would be reading the correct oil pressure EXCEPT it was kind of bouncing back and forth slightly.

I was concerned about not getting oil through the pushrods...
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Old May 24, 2006 | 04:36 PM
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From: Calgary, AB
Car: 1993 Nissan 240sx
Engine: Turbo KA24DE
Transmission: 5 spd
Axle/Gears: 4.08 VLSD
Well if the gauge is dancing around that can also mean the sender is fuxx0red, right?
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Old May 24, 2006 | 04:44 PM
  #7  
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
yea. i hope its nothing but this is MY car so i know there is a big problem there...

can anyone else comment on the not getting oil to the heads??
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Old Jun 17, 2006 | 04:13 PM
  #8  
CamarosRUS's Avatar
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Just now got to start the car again and noticed very low oil pressure. Got a mech gauge hooked up but havnt stared it again...scared to screw more stuff up....

Any other input/suggestions/comments???
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Old Jun 17, 2006 | 08:19 PM
  #9  
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From: Calgary, AB
Car: 1993 Nissan 240sx
Engine: Turbo KA24DE
Transmission: 5 spd
Axle/Gears: 4.08 VLSD
See what the mech gauge says? Engine flush?
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Old Jun 17, 2006 | 08:29 PM
  #10  
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
The mech gauge shows 10 PSI at idle and 30+ up to 60 PSI with RPM's.

I'm worried about the low idle PSI.
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