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Oil pressure at 130 psi on display low down to 129 , where is the sending unit on 2002 buick lesabre?

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Should be on the housing near the oil filer on a v-6, behind passenger wheel at bottom of engine compartment. if not your local auto parts store should be able to look that up for you. if not any oil change shop can point it out to you.

Posted on Sep 10, 2010

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Posted on Jan 02, 2017

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Need to know where the fuse is for oil sending unit on a 1998 Buick Park Avenue with a 3800 v6


There is no fuse for the oil sending unit ! Oil lite on , gauge not working ? Do you know what PCM five volt reference voltage is ? The PCM - engine computer supply's a stable 5 volt voltage to engine sensors . The oil pressure sensor is one of these sensors .
Engine Oil Pressure Sensor
The engine oil pressure sensor is a solid state transducer. The engine oil pressure sensor sends oil pressure information to the PCM. The PCM then transmits the oil pressure information to the IPC via serial data.
Engine oil pressure is displayed on the scan tool in volts. A low voltage reading indicates low oil pressure. As the oil pressure increases, the voltage level also increases. The normal range of the engine oil level sensor signal voltage is 0.5 volts at 0 kPa (0 psi) to 4.5 volts at 883 kPa (128 psi).

Jul 02, 2017 | Buick Cars & Trucks

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What should the psi compression be thanks.


It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

May 17, 2016 | Cars & Trucks

1 Answer

I need to replace the oil sender switch on my 2002 Buick La Sabre


first need to buy oil pressure sending unit 3/8 deep socket remove oil pressure sending unit you need teflon tap sealer for oil sending unit threads.okay to replace oil pressure sending unit.you need safe raise support vechicle locate oil pressure sending unit next to the oil filter.disconnect oil pressure sending unit wire connector then use oil pressure sending unit 3/8 socket remove the sending unit.then take new oil pressure sending unit use teflon tape white plumbers tape or use thread sealer apply to the oil pressure sending unit threads then install new oil pressure sending unit and reconnect electrical connector to sending unit.then crank engine check for oil leak if all is good lower vechicle back to ground wait several minutes check engine oil level.you good to roll.

Feb 09, 2013 | 2002 Buick LeSabre

1 Answer

I have oil in the care but the oil pressure not raising


if oil level okay in car,have oil pressure checked should be 60 psi @ 1850 rpm if not,your oil pump faulty or you have worn engine bearings.if oil pressure is low you will hear rod bearing noise like engine knocking bad, thats bad news engine damaged.if oil pressure okay, you could have faulty oil sending unit or oil level sensor on oil pans faulty.have vechicle code scan before buying new oil level sensor.

Sep 08, 2012 | 1995 Buick LeSabre

1 Answer

Low oil pressure after heads replaced


Was the oil changed? Has the low pressure been verified with a mechanical test gauge at the oil pressure sending unit pressure port? Do that 1st before assuming the pressure is low.

Feb 21, 2012 | 2002 Buick LeSabre

1 Answer

Oil Pressure reading 130 psi - What could be the problem ?


could be the sending unit, have a manual guage installed to get true pressure , if high replace the filter and try again,

Oct 23, 2010 | 2000 Buick LeSabre

2 Answers

Oil pressure gage registers 129lbs on my 2000 Buick Lasabre Limited


You either have a bad sender, poor connection, or a bad guage. Replace the sender first.

Mar 07, 2010 | 2000 Buick LeSabre

1 Answer

The oil light come on for a second to indicate there's a problem, so I went to the message center to see what the pressure was, it was 129 PSI while idling at a light, as I accelerated the PSI dropped to...


Jack, I wouldn't trust the car's display. There's too many things that can go wrong from the sending unit to the display you're seeing (bad grounds, sender failure, connectors etc). A mechanical gauge is the best way. I have one right mounted on a "tee" fitting with the engine's OEM sending unit on my 3.5L GM V6. Same one I pulled off my old 3.1L Malibu. Most GM 3 liter series engines are similar. If you don't have one/rather not mount one: get it to a tech you trust to check this issue out.
Most importantly though: an oil-starved engine is a soon to be a recycled engine. It won't last long. It will get noisy and nasty sounding very fast - right before it seizes up for good. If anything, pressure should be going up when accelerating from idle if that reading your getting is in the actual ballpark which could be any number of things: oil pump, crank bearings, fuel/coolant contaminating the oil...
All this is assuming the oil is at the right level, right viscosity, no leaks, changed often (and the filter too!).
Good Luck!

Apr 13, 2017 | 2000 Buick LeSabre

1 Answer

Low Oil Pressure?


Thats fine. It only takes 4 psi of pressure to keep your engine oiled.

Dec 24, 2008 | 2005 Buick LeSabre

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