Possible Oil sending unit or gauge cluster?

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Sarge

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First off, im new, and ive been creepin the site for a bit now. Just picked up a 99' 2 Door 4x4 Tahoe 5.7.

Ive searched, but i dont think i have found someone with my exact issue.

Got the truck and have put 300 or so miles on it, cold start oil pressure would read 40-45 idle, and 40-50 going down the road. 20-35 warm idle, 35-45 going down the road. Luckily for me, im not new to gm. I work and own a 02 Camaro SS, and i am aware of how you cant trust a crappy oil sending unit/ or stock gauge. But to the issue.

Driving home one day and the gauge reads 40psi going down the road, and all of a sudden it shoots all the way over where 140 would be.. Pull off turn it off. All seems fine, motor runs and sounds fine. Turn the key on power, and the gauge goes from ''140 area'' to 0. Crank it, it goes to 30, im like heck ya! Tap the gas, Shoots all the way back.. Now, of course i know the pressure reading isnt correct. Now after about 4 days of driving it, it will stay at that 140 ''area'' reading 99% of the time, and will go back down to 0 when first click power is turned on via lock cylinder. Do you guys think its a oil sending unit? Or my gauge cluster? And if you do think it is the oil sending unit, ive looked and it seems like there are alot of different options for this tahoe, could any one supply a BWD or Delco part #? Is there a way to reset it, maybe change my oil?

Sorry for the story, just trying to get it fixed bc i am ocd on gauges, lol

Thanks!!
 
Last edited:

SunlitComet

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:welcome:

Wait for it.....

---------- Post added at 11:52 AM ---------- Previous post was at 11:46 AM ----------

Engine Oil Pressure Gauge Always High
Symptom Related Diagnostic Procedures
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Notes
170618284

Engine Oil Pressure Gauge Always High (Gas)



Engine Oil Pressure Gauge Always Low
Symptom Related Diagnostic Procedures
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Notes
170618294



Engine Oil Pressure Gauge Inaccurate or Inoperative
Symptom Related Diagnostic Procedures
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Notes
170618298

Engine Oil Pressure Gauge Inaccurate Or Inoperative (Gas) (Part 1 Of 2)

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Notes
170618302

Engine Oil Pressure Gauge Inaccurate Or Inoperative (Gas) (Part 2 Of 2)



Gauges
Instrument Cluster Analog Schematics
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Notes
79223970

Instrument Cluster: Analog Schematics (Gauges)






Service and Repair REMOVAL PROCEDURE



  • Tools Required
  • J 41712 Oil Pressure Switch Socket

82170182





  1. Disconnect the electrical connector.
  2. Hold the engine oil pressure sensor fitting with a wrench. IMPORTANT: Note the alignment of the oil pressure sensor fitting prior to removal.
  3. Remove the engine oil pressure sensor using J 41712.

82170183





  1. Remove the engine oil pressure sensor fitting, if necessary.
INSTALLATION PROCEDURE

NOTICE: Fastener Notice in Service Precautions.


82170184





  1. Install the oil pressure sensor fitting, if removed.
1.1. Tighten the engine oil pressure sensor fitting to 15 Nm (11 ft. lbs.) . IMPORTANT: Do not loosen the fitting. Do not tighten more than one turn.


1.2. Tighten the fitting until properly align.
82170185





  1. Install the oil pressure sensor.
  2. Hold the oil pressure sensor fitting with a wrench to prevent from turning.

    • Using J 41712 tighten the oil pressure sensor to 30 Nm (22 ft. lbs.) .

  1. Install the electrical connector.
 

SunlitComet

OBS Jedi-Do Good
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Because the server link expires after so many hours and shown unrelated pics so delete them when i can. Do you need them again and for what year?

---------- Post added at 10:19 PM ---------- Previous post was at 10:17 PM ----------

One year when they let me post pdf attachments it won't be an issue but as usual it goes un-dealt with.
 

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