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

17,815

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
    ericjames
    Reputation
    400
  • #2
    dandyoun
    Reputation
    390
  • #3
    Js08016
    Reputation
    330
View All

Related Models For Sale

Used Chevrolet TrailBlazer
5 Great Deals out of 49 listings starting at $700
Used GMC Yukon
10 Great Deals out of 859 listings starting at $5,950
Used GMC Envoy XL
11 listings starting at $2,950
Used Chevrolet Tahoe
6 Great Deals out of 632 listings starting at $6,871
Used Ford Explorer
45 Great Deals out of 1,364 listings starting at $3,900
Used Jeep Grand Cherokee
108 Great Deals out of 2,738 listings starting at $1,871
Used GMC Sierra 1500
224 Great Deals out of 10,442 listings starting at $2,995
Used Honda Pilot
14 Great Deals out of 839 listings starting at $2,900
Used Toyota 4Runner
6 Great Deals out of 418 listings starting at $5,995
Used Chevrolet Silverado 1500
161 Great Deals out of 10,662 listings starting at $100
Used Ford Escape
223 Great Deals out of 5,228 listings starting at $1,495

Used Cars For Sale

2005 GMC Envoy 4 Dr SLT 4WD SUV For Sale
1 listings starting at $7,995

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.