Question about 1999 GMC Denali

2 Answers

Low oil pressure

My 1999 denali has low oil pressure when it gets warmed up it and is a running speed going down the highway the oil pressure is only at 22.

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • GMC Master
  • 599 Answers

Did you check this with a mechanical guage,what weight oil are you using,does this car have an oil cooler. get back to me, also what engine and milage Thanks Ray

Posted on Nov 12, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,615 Answers

You may have a bad sensor or the oil is in need of service. Only hands on diagnosing will find an answer

Posted on Nov 12, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

While going down highway (at) 70 mph, why did car just turn off?


Low oil would not show up on the engine computer, but low oil pressure would. If the oil light did not come on before the engine stopped, its possible you toasted the engine.

Oct 27, 2015 | 1999 Dodge Stratus

1 Answer

Check engine light blinking car shaking, oil light on after a few miles from starting


May be low oil, low oil pressure (faulty oil pump) or a bad pressure switch. When your at highway speeds the pump, pumps faster & brings the oil to the right PSI. Try a thicker oil than called for, get the oil pressure checked,oil leaks? & get the switch ckd out.

Jul 30, 2017 | Dodge Stratus Cars & Trucks

1 Answer

Gm diesel 6 5


Have to service these a lot it's the MAP sensor ( manifold absolute pressure sensor ) this should fixya.

b8f6a7d4-6342-4203-9911-2ab2bef97c0f.jpg

Nov 25, 2013 | 1999 GMC Suburban

2 Answers

Low oil pressure, trucks runs rough after it warms up, can not drive highway speeds it jumps and spits


Have you tried to replace the oil pressure sensor - it helps regulate your oil pressure in your vehicle. Not an expensive part but they do go out from time to time.

Nov 04, 2012 | 2001 Dodge Dakota

1 Answer

I have a 2000 lsi sedan 4cyl runs excellent good compression mileage has got considerably worse down to 22 hwy any ideas


*Oil change.
*Accurate tire pressure. (highway drivers experience better MPG with tire pressure 2-3 pounds higher than whats called for on tires)
*Tune up/spark plugs
*Injectors clearer/replacement. STP injector cleaner
Bad fuel/low grade/gas supplier might be bad. Try new gas station

Mar 30, 2011 | 2000 Chevrolet Metro

1 Answer

Oil pressure drops with reduced rpm,after about 10 min of driving


OIl will get thinner as it warms up and since the oil pump speed is directly affected by the engine RPM's, a drop in pressure after the car reaches operating temp is normal. The question is what are the pressure readings "cold" and "hot" and are they within acceptable specs.

At idle the oil pump is not spinning that fast. When your cruising down the highway, the engine is turning a lot faster and therefore the pump is spinning faster. The faster the pump spins, the more pressure it will make to a point.

Since pressure and flow can be affected by the "weight" of the oil and the operating temperature of the engine, It's hard to make a diagnosis on the internet. You should take it to a repair facility that you trust and have them hook up a mecahnical oil pressure gauge and monitor the pressures cold and hot at idle and crusing RPM's. Then compare the readings with what Jeep says is acceptable.

Low oil pressures can be an indication of among other things worn bearings.

Feb 15, 2011 | 1999 Jeep Grand Cherokee

1 Answer

Low oil pressure, confirmed oil level is good. so before going all the way to changing oil pump, could it be the oil sending unit?


when the engine is cold the oil pressure should read 60 psi
when the engine warms up at operating temp. it should read 12-16 psi while running at speeds 40+ it should read about 38-42 psi.
it it reads all that its not you sending unit
remember its a GM they use the poorest oil pumps on the market. usually I won't see a pump going out untill over 100K or so. its the same frame as the suberben, yukon, tahoe,denali.
4WD will make the job 3 times harder. If you do have the job done ask for a high volume pump

Sep 12, 2010 | 2007 Hummer H2 SUT

3 Answers

It plunges down to zero at times then reads eratic


Your oil becomes too fluid as the engine gets warmer. When the engine rotates slower at stops, the oil pump won't make pressure. At speeds, more oil is pumped and the pressure rises.
Have you recently changed your oil? Or maybe is too old. The real problem would be if you read zero at normal cruising revolutions.

Dec 01, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Oil pressur low


I have just cured my low oil pressure (and leaks) by using a stop a leek additive from e-bay. LUCAS engine oil stop a leak. £14.99($22 approx)
It takes a while too get it in the engine as it is extremely thick, but works very well. It evens stopped the slight noise from the oil pump.

Sep 26, 2009 | 1996 Pontiac Trans Sport

1 Answer

Isuzu trooper engine stops while driving


If its the 3.0 diesel it could be the rail oil pressure sensor starting to pack up .

Jan 21, 2009 | 1999 Isuzu Trooper

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

156 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75077 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...