Had sludge in engine,and it was drain.Now oil pressure is dropping

Asked by Feb 27, 2017 at 10:26 PM about the 2002 GMC Envoy 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

I had a valve cover replace on my 2002 gmc envoy
slt.the guy working on it found sludge built up.she
drain it for 3 days and refill with new oil,now low oil
pressure is coming on.Is it safe to drive it like that

1 Answer

21,135

I just wonder if this sludge has drained down to and on/in pump pick up tube. I think it will come out but may need a intervention to do so, I think pulling the pan to check and if sludged up then clean pan and pick up tube and if its really bad pull the pump out look at it and if need be replace it. I have seen some bad sludge in engines, one way to deal with this is to drain all oil pour in diesel fuel until whole engine is full and let sit overnight and then use crank wrench and spin engine over a few times, drain it and repeat until it comes clean, Now you say why would I do this it can break down the sludge and can pour it in over the head with valve covers removed to get the sludge out of the oil circulating ports, if it gets rock hard (it will) then its too late as there is noway to push rods threw it completely to get it all out while engine is assembled.

Your Answer

GMC Envoy Experts

  • #1
    dandyoun
    Reputation
    420
  • #2
    ericjames
    Reputation
    410
  • #3
    Js08016
    Reputation
    340
View All

Related Models For Sale

Used Chevrolet TrailBlazer
45 Great Deals out of 4,221 listings starting at $1,500
Used GMC Yukon
601 Great Deals out of 20,281 listings starting at $2,500
Used GMC Envoy XL
12 Great Deals out of 661 listings starting at $1,750
Used Chevrolet Tahoe
792 Great Deals out of 41,769 listings starting at $1,987
Used Ford Explorer
1,199 Great Deals out of 69,505 listings starting at $1,000
Used Ford Escape
1,262 Great Deals out of 104,431 listings starting at $895
Used Jeep Grand Cherokee
1,038 Great Deals out of 72,170 listings starting at $1,195
Used Nissan Murano
401 Great Deals out of 23,270 listings starting at $400
Used Ford Expedition
392 Great Deals out of 17,341 listings starting at $1,500
Used GMC Sierra 1500
1,182 Great Deals out of 64,422 listings starting at $999
Used Honda Pilot
704 Great Deals out of 40,612 listings starting at $998

Used Cars For Sale

2005 GMC Envoy 4 Dr SLT 4WD SUV For Sale
60 listings starting at $2,900

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.