I own a 5.3 2007 Avalanche. It has 160k miles. When it is first started it holds approx. 40 pounds of oil pressure, once it warms up, when idling it drops to 0 and the bell goes off. If I give it a li

Asked by Jun 28, 2017 at 03:37 PM about the 2007 Chevrolet Avalanche LTZ 4WD

Question type: Maintenance & Repair

I own a 5.3 2007 Avalanche. It has 160k miles. When it is first started it holds approx. 40 pounds of oil pressure, once it warms up, when idling it drops to 0 and the bell goes off. If I give it a little gas, it stops until I let off the gas. There is no knock, no click, nothing.  What could my problem be?

2 Answers

Hi. I have a recently acquired 2007 5.3 Avalanche with 215K miles with 15K on a rebuilt engine. Supposedly it had fresh fluids all around so I had planned an oil change. B4 that change - I had the oil pressure sensor light go off on my morning commute - telling me to stop the engine due to "No Oil Pressure". Since my temps were normal on the gauge and no lifter noise, I assumed the Oil Pressure Sensor was bad. More interestingly was that when the engine was shut down for a time, it took about 10 minutes for the warning to crop up - something to do with the oil heating up and something (I'm not sure happening with the sensor). So at the earliest opportunity I changed the oil to Pure Synthetic (Schaeffer 9000) 5W30, Mobil 1 Oil Filter and that took care of the warnings I was getting. I am keeping track of mileage and keeping an eye on oil level - as we all should. I'm not sure if it was debris that cleared out which I would doubt given that the mechanical nature of the setup or if it is sensitive to oil viscosity/age (i.e. If you do need to change the sensor - there's several videos out that show how to do it without removing the intake. I know as I was reviewing this to change my sensor. Keep in mind that if you are going to change the sensor - you may as well change the screen filter in the oil supply line that goes to it. I have driven about 500 miles since the oil change with no "warnings". My pressure when running ranges from 45 to 55 psi and drops to about 20 psi when idling warm. Good Luck.

My problem was fixed with the gauge cluster and oil sending unit. I had good oil pressure at idle cold, and would slowly drop to zero and only come off of zero when revving hard. No engine noise present and ran fine. I have been running about 10k miles since with no issue after changing the cluster and sending unit. What I'd suggest is connecting an oil gauge to the sending unit port and measuring the oil pressure yourself. If it's indeed low in warm idle conditions and stays that way, then you need to dig mechanical. Most people have solved the mechanical side of this issue with the oil pick up tube o-ring.

Your Answer:

Chevrolet Avalanche Experts

  • #1
    Tom Demyan
    Reputation
    410
  • #2
    David Scott
    Reputation
    180
  • #3
    Markw1952
    Reputation
    170
View All

Related Models For Sale

Used Chevrolet Silverado 1500
97 Great Deals out of 11,107 listings starting at $4,950
Used Chevrolet Tahoe
10 Great Deals out of 790 listings starting at $5,900
Used Ford F-150
129 Great Deals out of 11,549 listings starting at $3,900
Used Cadillac Escalade EXT
14 listings starting at $9,999
Used GMC Sierra 1500
80 Great Deals out of 10,270 listings starting at $5,795
Used Dodge Ram 1500
36 Great Deals out of 521 listings starting at $2,500
Used Cadillac Escalade
13 Great Deals out of 535 listings starting at $4,495
Used Chevrolet Colorado
9 Great Deals out of 2,331 listings starting at $3,995
Used Chevrolet Suburban
12 Great Deals out of 474 listings starting at $8,995
Used Toyota Tundra
29 Great Deals out of 1,476 listings starting at $4,500
Used GMC Yukon
16 Great Deals out of 1,032 listings starting at $5,500
Used Toyota Tacoma
19 Great Deals out of 1,727 listings starting at $6,413
Used Chevrolet Silverado 2500HD
11 Great Deals out of 1,171 listings starting at $4,495
Used Honda Ridgeline
9 Great Deals out of 408 listings starting at $4,870

Used Cars For Sale

2012 Chevrolet Avalanche LTZ 4WD For Sale
6 listings starting at $16,995
2011 Chevrolet Avalanche LTZ 4WD For Sale
9 listings starting at $17,995
2010 Chevrolet Avalanche LTZ 4WD For Sale
6 listings starting at $16,900
2009 Chevrolet Avalanche LTZ 4WD For Sale
1 listings starting at $18,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.