Question about Cars & Trucks
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
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
SOURCE: oil pressure sending unit
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.
Posted on Mar 17, 2009
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,
Posted on Mar 30, 2009
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
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
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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