Newto4x4

so my oil meter on the dash goes haywire when i step on the peddle it goes up and wen i come to a stop it goes down, car runs perfect with no problems but the dash always catches my eye lol, anyone have a diagram how to, on how to change the oil pressure sensor or switch on a 99 tahoe LT 5.7 engine.


i kno autozone lends you the tool i just cant find any solid info where/ how to get to and change..

thanks anyone ahead of time

cleveland63b

how far up and down? some fluctuation is normal

Newto4x4

no im talking bout from 0 to max, up and down fluctuating wen i step on the peddle and stop it always moves around, thats not normal at all, im pretty sure the sensors bad, the car runs 100 perfect no problems at all, but i just need a write up or direct way to find it none of the autozones around here have the manuals i need, im hoping some more help comes by on here with the correct info, i hear its behind the distributor on my engine in the back part of the driver side.. its been raining here last few days so i havent been able to get under and look for myself yet

in2pro

Also attached is the removal procedure


Service Information
1999 Chevrolet Tahoe - 2WD | Escalade, Pickup (Classic), Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Document ID: 23360
--------------------------------------------------------------------------------

Oil Pressure Diagnosis and Testing
With the vehicle on a level surface, allow adequate drain down time, 2-3 minutes, and measure for a low engine oil level.
Add the recommended grade engine oil, and fill the crankcase until the oil level measures FULL on the oil level indicator.

Operate the engine and verify low or no oil pressure on the vehicle oil pressure gage or the oil indicator light.
Listen for a noisy valve train or a knocking noise.

Inspect for the following:
• Engine oil diluted by moisture or unburned fuel mixtures

• Improper engine oil viscosity for the expected temperature

• Incorrect or faulty oil pressure gage sensor

• Incorrect or faulty oil pressure gage

• Plugged oil filter

• Malfunctioning oil filter bypass valve

Remove the oil pressure gage sensor or another engine block oil gallery plug.
Install an oil pressure gage.
Start the engine and then allow the engine to reach normal operation temperature.
Measure the engine oil pressure at the following RPM:
Specification

42 kPa (6 psig) minimum, at 1,000 RPM
125 kPa (18 psig) minimum, at 2,000 RPM
166 kPa (24 psig) minimum, at 4,000 RPM
If the engine oil pressure is below minimum specifications, inspect the engine for one or more of the following:
• Oil pump worn or dirty

• Malfunctioning oil pump pressure relief valve

• Oil pump screen loose, plugged, or damaged

• Excessive bearing clearance

• Cracked, porous or restricted oil galleries

• Engine block oil gallery plugs missing or incorrectly installed

• Broken valve lifters

corvetteguru

before assigning this problem to the old "the engine is broken" mantra, do some old fashioned diagnosis.

Get a mechanical gauge and screw it into the port where the oil pressure sensor goes. monitor it. I am betting money that the problem is with the gauge and not with engine.

irishmjk

I actually had the same issue and found the pickup screen on the pump had partially fallen off and was blocking the port. Removed and cleaned the screen and pump. Problem solved. Not sure if this applies to you but something else to look at. I agree with corvetteguru to hook a manual gauge as a diagnostic before doing anything else.