Lifter knocking questions???

Asked by Khandi4474 Jul 31, 2015 at 12:22 PM about the 1994 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

I purchased a 94 GMC Sierra 1500, all original and in immaculate shape. I am having only a couple of issues and am curious. There is a knock where a lifter may be bad, but also we had it diagnosed and it needs the EGR valve replaced. Is there a correspondence between the two and if not, could the knock possibly be just the need for a different weight of oil? Do you recommend anything to determine whether or not the lifter is going bad or what I can do to quiet the tapping? It's not horrible, but it is noticeable, and since living in a hot climate (South Texas, 99 degrees- 105 degrees lately), is it best to use a heavier weight oil? I notice the knocking is more pronounced when driving on really hot days, so??? Also, hubby is ready to get rid of it, and my son and I LOVE it and don't want to, but don't want to have the added expense if something is REALLY wrong. Is he wrong, or should I get what I can a get out of the vehicle before my family and I are stranded with no vehicle, again?

1 Answer
65,650

firebird338 answered 9 years ago

If you change your oil leave out one quart and add a bottle of Lucas Engine Oil Stabilizer it will stop that tapping because I have seen and heard it stop a tap my friends vehicle had. With in 30 - 45 minutes of idling the tap was gone.

Mark helpful

Your Answer:

Related Questions

  • Lifter knocking questions??? 1 Answer

    I purchased a 94 GMC Sierra 1500, all original and in immaculate shape. I am having only a couple of issues and am curious. There is a knock where a lifter may be bad, but also we had it diagnosed and...

    1994 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • Knocking in oil pan 3 Answers

    I start my truck. Oil pressure is showing good no knocking. As i drive it to work and truck is at regular heat now. I make frequent stops amd when i brake at a light it starts making a knocking noi...

    1994 GMC Sierra 1500 C1500 SLE Extended Cab SB

    -

    Maintenance & Repair

  • Knocking noise in engine 5.3 GMC 2013 3 Answers

    My truck only has 20,000 miles on it and started knocking at 19,000 miles took it to the dealer and they stated it was normal characteristics of the motor. i was a mechanic back in the 70 s and rebu...

    2013 GMC Sierra 1500 SLE Ext. Cab

    -

    Maintenance & Repair

  • Knocking 1 Answer

    My Sierra1500 gmc sle knocks when it runs. No starting problems. Lifters?

    1997 GMC Sierra 1500 K1500 SLE 4WD Extended Cab LB

    -

    Maintenance & Repair

  • Egr delete questions 1 Answer

    1992 GMC Sierra 1500 K1500 4WD Extended Cab SB

    -

    Maintenance & Repair

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,860
  • #2
    dragonflyoffshore
    Reputation
    11,810
  • #3
    John Saffrahn
    Reputation
    11,750
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
304 Great Deals out of 12,179 listings starting at $1,712
Used GMC Yukon
15 Great Deals out of 844 listings starting at $6,995
Used Toyota Tacoma
32 Great Deals out of 1,079 listings starting at $8,888
Used Dodge RAM 1500
5 Great Deals out of 64 listings starting at $3,000
Used Chevrolet Tahoe
11 Great Deals out of 912 listings starting at $4,998

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. Content will be removed if CarGurus becomes aware that it violates our policies.