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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  • 32 Answers

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

Posted on Oct 30, 2015

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Posted on Jan 02, 2017

  • 599 Answers

SOURCE: Oil Pressure Gauge is fluctuating.

center back of motor behind distributor..bulbous

Posted on Dec 08, 2008

emissionwiz
  • 75066 Answers

SOURCE: oil light comes on after car is warmed up

MOST COMMON ISSUE WITH THE OIL LIGHT IS THE ENGINE OIL PRESSURE SENDING UNIT, REPLACE IT, ALSO 3/4 SCALE TEMP IS NORMAL, THAT IS WHEN THE COOLING FAN KICKS ON, ABOUT 230 DEGREE'S F.

Posted on Dec 11, 2008

  • 1 Answer

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. sebring1962@yahoo.com

Posted on May 15, 2009

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1 Answer

Fluctuating oil pressure


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

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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.

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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.

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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.

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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.

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

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'oil pressure gauge


Replace the useless oil pressure sending unit with one from a early year such as 1986 .connect only the wire to the oil light.if you want a pressure gauge install an after market one..The stupid factory sending units can not rear pressure under 40lbs.at less than 40psi the light is on and the gauge reads 0 good luck carl

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