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I have a 2004 Chevy Silverado. 4.3 liter engine when I start the truck oil gauge reads just above 40 , th the pressure gaugge starts to slowly drop d gage starts to slowly drop down to 0. Could it be the oil sending unit or the pump itself and how can I check them

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  • Cars & Trucks Master
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Most gms I have seen run low oil pressure..the sender is usually next to the distributor shaft on the rear of the intake or close to the oil filter..under the engine.. change the sender out first and possibly change to a heavier weight oil( instead of 10- 40 go to 20-50 or some such nmber..good luck..

Posted on Jan 20, 2013

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  • Cars & Trucks Master
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Dear Bill, You will need to find a mechanic who can remove the oil pressure sending unit from the engine block and insert a "real" oil pressure guage to tell if you really have a problem or not. Lots of factory dashboard guages are not very accurate over time. If you really do have that low of oil pressure, you need to address that quickly.

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

farroutideas
  • 78 Answers

SOURCE: oil pressure sending unit

Hi there;

Your looking foer the oil pressure sensor on the 2004 8.1L.
You will find it located directly behind the EGR valve threaded into the block just to the drivers side of the center bolt for the transmission to block connection.

Thanks
Farrout!

Posted on Mar 17, 2009

  • 64 Answers

SOURCE: changed oil pressure switch,still no oil pressure

The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
ChevRev

Posted on Mar 30, 2009

  • 6982 Answers

SOURCE: 2002 jeep wrangler oil pressure gauge drops

When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

Posted on May 30, 2009

RonPark
  • 855 Answers

SOURCE: 03 gmc envoy with 5.3 140000 miles. Oil pressure

There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.

Posted on Oct 02, 2009

  • 95 Answers

SOURCE: 1991 chevy S10 blazer fluctuating oil pressure

I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.

Posted on Oct 17, 2009

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1 Answer

Why is oil pressure gauge dropping below 40 psi.


Usually two reasons why oil pressure drops over time,worn engine parts,old oil.Try an oil change with new filter I sometimes use an additive like Restore.Over time the oil will become thinner and less viscous leading to a drop in oil pressure.

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Alrighty. I've asked this a few times before, I have more info now. CHEVY 350 K1500. 1993. Replaced intake gaskets, (bad oil leak) dropped a small amount of coolant in with oil while doing so. Changed oil...


how did you clean the gasket off of the head? if you used a sanding disc the grit will eat up the bearings. are you reading pressure with a mechanical gauge? you have replaced all bearings??

6 psi @ 1000 RPM
18 psi @ 2000 RPM
24 psi @ 4000 RPM
this is chevrolet specs on oil pressure in your truck so you are within the range.

describe your idle problem more and i will try and help you with that

Feb 02, 2011 | 1993 Chevrolet K1500

4 Answers

Oil pressure drops to 0 if i turn off truck and restart it goes back up to 40


Do you have enough oil in it? If it's real low on oil the oil can't flow back into pan fast enough to keep the pump from cavitating. It might be the gauge try puting a mechanical gauge on it for test purposes. When the gauge drops to zero does the engine get louder, like it's not getting oil? Do you hear the lifters start to clatter, or rods starting to knock? If the engine sounds normal there's a good chance it's just the gauge. If it's making noise shut it off right away!!!

Dec 12, 2009 | 2005 Chevrolet Silverado

1 Answer

2002 jeep wrangler oil pressure gauge drops


When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

May 30, 2009 | 2002 Jeep Wrangler

2 Answers

Oil pressure reading


I have a gmc envoy (same thing) and it does the same thing. normal.

May 28, 2009 | 2000 Chevrolet Blazer

3 Answers

Oil pressure on a 2004 5.3 liter silverado at idle is around 20


The pressure to be most concerned with is the reading in gear at idle with engine warmed up...Low end really should not be below 20. If pressure wanders, change the sending unit and check actual pressure with a mechanical gauge if necessary. The age and quality of your oil, as well as temperature all play a part in pressure, as well as internal wear from time & miles of use. If pressure changes with rpm, that is normal. 40psi is good while driving.
need more info just ask.

Apr 27, 2009 | 2004 Chevrolet Silverado

2 Answers

Changed oil pressure switch,still no oil pressure


The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
ChevRev

Mar 30, 2009 | 1999 Chevrolet Silverado 1500

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