Question about 2001 Chevrolet Express

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2001 chevy express 15 passenger van. No oil pressure. I pulled into my drive way and put my van in park and looked at my gauges when I noticed my oil pressure was reading 0 on my pressure gauge. The van is not leaking any oil. Any help would be appreciated! Thanks

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Likely oil pressure sending unit went out

Posted on Jul 18, 2009

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2001 Chevy express van oil pressure


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Oil pressure fine when engine cool or not at idle.when at idle and engine warm pressure drops to zero,chevy 2001 express 1500 van


Since the oil pressure reads fine when cool or not at idle, the problem is probably the oil pressure sending unit. The easiest way to check is by replacing it, and it is fortunately not an expensive part.
Let's hope that is the correct fix.....
Think about how you noticed the problem....was it a gradual thing, with the gauge reading lower and lower until it was at zero, or one day it suddenly just happened? If it was a sudden thing, the sending unit is the probable cause. If it was gradual, there are several other possibilities, one being the oil pump itself. When an engine warms up, the oil thins, and a worn oil pump cannot deliver as much pressure. This can be fixed for a relatively low cost by a do-it-yourselfer in an afternoon or so, by replacing the oil pump. This requires removing the oil pan, and in some (not all) cases the engine must be unbolted and jacked up enough to allow the oil pan to be removed. A worst case scenario would be if the loss of oil pressure at idle is caused by worn main engine bearings. This would require major engine service.
If you really do not want to put any money into your van and just need it to last a little while longer, if the problem turns out to be main bearings, you can alternatively add an oil thickening agent like "STP" or "Motor Honey" to the oil and thicken it up enough to build up some extra pressure. Please be advised that this is not a "fix", but it will get you a few more miles out of your van in a pinch....eventually the bearings will fail. This will also help a worn oil pump build pressure, but it depends on how worn it is. This about covers "best case", "middle case" and "worst case" scenarios. There are some in-betweens, but unless you have noticed strange engine noises you do not have to worry about them as much.
Stay positive and go for the oil pressure sending unit first!

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Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.

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My chevy 1500 express passenger vans oil pressure gauge in the dash is reading at the highest number 80, it normally reads at around 55, it just started doing it, it has the correct amount of oil in it,...


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You should replace it. Until you do it is OK to drive your vehicle. The part is $20 to$30. If you can remove the engine housing in the van, the sending unit will be staring you in the face. It is about 3" long and about 1&1/4 " in diameter at the base. And of course there is wire/wires going to it.
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I have a gmc envoy (same thing) and it does the same thing. normal.

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Overheating


If you are adding anti-freeze every time this happens, you are still loosing coolant some were. I assume there are no puddles on the garage floor or where you park the van? Check the oil dipstick and make sure the oil is not a "milky"color. Check the passenger side carpet for wetness, you may have to pull it back.
If all of that is OK, you are still burning the coolant by way of the intake gasket or head gasket.
Good luck, let me know.
Regards,

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