Question about 2002 Chevrolet Astro

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Oil pressure gauge fluctuating from 25 to 55 from sighting still at a light to taking off. Also, goes to nothing when turning without any gas given. Motor runs great even though this is happening

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Sounds like a bad oil pump. Stop running the engine!

Posted on Oct 30, 2015


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Posted on Jan 02, 2017

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SOURCE: Oil Pressure Gauge is fluctuating.

center back of motor behind distributor..bulbous

Posted on Dec 08, 2008

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SOURCE: oil light comes on after car is warmed up


Posted on Dec 11, 2008

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SOURCE: oil pressure gauge is at 80lbs of oil pressure

There is a recall on the gauge cluster. I Have the same problem with mine my Speedo reads wrong and my oil pressure is really High. GM Warrantys the Cluster up to 75,000 miles

Posted on Jan 20, 2009

  • 18 Answers

SOURCE: Fluctuating oil pressure gauge.

Two quarts is about half the capacity. The pump was probably starved of lubrication and is failing.

If that's not expensive enough, you may now have a problem with a damaged engine. You may want to just put that money into a new vehicle.

I don't think the car would have enough power in its present condition to get high enough to reach a cliff, and driving it into a lake would not be environmentally sound. Besides, the fine would not be worth it.

The cheapest and easiest maintainance that anyone can do on a car to avoid expensive repairs is still checking the oil ever 1000 miles (filling if necessary!) and changing it every 3000.

Posted on Mar 18, 2009

  • 5 Answers

SOURCE: oil pressure gauge

Common problem with the sending unit on the LT1, pegs the oil pressure gage. You have to replace the sending unit and the intake manifold has to be removed to get to it. Get new intake gaskets I think PT#12533587 about $80 good guy price and I do not remember the PT# or price for the sending unit.

Posted on May 15, 2009

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I have a Ford Expedition 1998 5.4 engine ... when starting the engine oil pressure light goes to a minimum ... I changed the oil pressure sensor, but obviously this is just for the lamp, where the second...

don't rely on the oil pressure gauge in the dash, it's not a real oil pressure gauge. It's just a glorified "low oil pressure" lamp. It only has two readings - "normal" and "low", nothing else. The "sensor" in the block is actually just an oil pressure switch which you replaced.. which only has two states, on or off. If your gauge is fluctuating between "normal" and "low", it means either that the switch or wiring to the switch is bad, or that the oil pressure is so low that it barely makes the pressure switch turn on. If it's the latter, then it could be either low on oil... not! Or something clogged, such as oil pickup tube, filter or oil channels. Other causes for low oil pressure is a failing oil pump, or worn out journals or main bearings, which basically means the engine is worn out.
Hope this helps a little. Could get it checked at a shop with a mechanical pump gauge to see what your true pressure is. Thatll tell you if it's the switch light is bad

Dec 25, 2017 | Cars & Trucks

1 Answer

Fluctuating oil pressure

replace the oil pressure senor they alway's fail on gm cars and trucks

Apr 05, 2012 | 2003 Chevrolet Impala

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2001 F150 pressure gauge reads zero and light comes on when slowing down to 1st gear and stopped, sometimes light and gauge goes off and pressure returns, but fluctuates...also when gas applied and vehicle...

I assume you mean "Oil" pressure...This is the first sign of the main bearings getting to the point of needing replacement. The fact that the pressure goes up when you accelerate tells me that the oil pump is working. There is just too much bearing clearance for the oil pump to keep enough volume flowing at idle to maintain pressure. In short, it's time for an overhaul. It will be less expensive if you do it now than if you wait until you spin a bearing and destroy a crankshaft, or put a rod through the side of the engine block.

Mar 06, 2011 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Oil gauge is fluctuating...on Low when at a standstill...moves up when i hit the accelerator...i just added 3 qts of oil...and i also have a coolent leak????

That is a good sign, it is working, my oil pressure fluctuates like a tachometer, at idle it is low, like 20 lbs, then when I 'm cruising, 35lbs, but it goes up and down when you pump the gas. The pressure gauge is reading the oil pressure at the top of the engine, it will show 45 lbs with only 1 qt of oil in there, it is not an oil level gauge. You might have an oil light buried on the dash somewhere that will light up if the oil gets too low. ,, Now about that coolant leak, it should have nothing to do with the oil pressure. Is it a hose? Radiator? Joint at the top of the engine? Where is it leaking, and what is it doing? Does it over heat? Or did it overheat? Is there oil floating at the top of the radiator? Does it blow steam out the exhaust? Does it have coolant or just water? Check it out. hope this helps.

Aug 29, 2010 | 2002 Jeep Grand Cherokee

1 Answer

I have a 2000 Ford Explorer Sport. After driving 15-20 minuets and coming to a stop the oil gauge fluctuates wildly. Sometimes the check engine light comes on. When I put the vehicle in park and give it a...

Sounds to me like it could be a bad oil sending unit or gauge. I would take it in to a shop and have them test the oil pressure with their equipment.
If they tell you the pressure is good try changing the oil sending unit first then if that don't work, replace the gauge.

Aug 26, 2010 | Ford Explorer Sport Cars & Trucks

2 Answers

Oil pressure gauge

A common problem is the pressure switch that is mounted on the camshaft position sensor on the left side of the engine while standing in front of the vehicle. This is the best thing that could be wrong and is most likely what is wrong. The worst thing is an internal pressure problem.

Feb 21, 2010 | 1999 Jeep Grand Cherokee

2 Answers

Oils pressure gauge fluctuates

check the oil viscosity,it might be too old(driven for toomany miles)..

if thats not ityou might need to get the oil preasure lubricating pump checked,and id suggest you do it fast or theres a lot of engine wear and tear.

Aug 05, 2009 | 1995 Jaguar XJ6

1 Answer

Check gauges and Check Engine Lights

The sending unit for the oil guage will cause the oil guage to fluctuate this is caused from some sludge build up that is more than likely stuck in the sending unit tube. Use Gunk motor flush on your next oil change this should help the oil guage problem.( make sure you read the direction on the back of the bottle)
As for the check engine light you can take it to Auto Zone and have them scan the computer. Sometimes the EGR valve will build up with carbon causing the valve to stick slightly open which will make the idle on the car fluctuate up and down. Its also possible you need O2 sensors.

Apr 07, 2009 | 1994 Mercury Cougar

1 Answer

Oil pressure

Your oil pressure sending unit is bad. Replace it and it should be fine agan.

Feb 06, 2009 | 2005 Hummer H2

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