Lifter knocking questions???

Asked by 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

17,660

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.

Your Answer

Add photo

Related Questions

  • My 2015 GMC sierra has engine tick 15 answers

    Had my new truck oil changed at dealership at 5000k, it developed a knock in the front end. 3 days later of being at dealership they didn't find out what was wrong but it stopped being noisy. Just h...

    2015 GMC Sierra 1500 SLT Crew Cab 4WD

    -

    Maintenance & Repair

  • Start a new question...tranny 1 answer

    1990 GMC Sierra 1500 K1500 4WD Standard Cab SB

    -

    Maintenance & Repair

  • 2000 GMC Sierra low oil pressure 1 answer

    Ok here it goes I have a 2000 GMC Sierra that I was hauling a large trailer with and the oil pressure dropped and ticking noise started. Changed the oil and put in a new pressure switch. Was told ...

    2000 GMC Sierra 1500 SLT 4WD Extended Cab LB

    -

    Maintenance & Repair

  • This is a response to a posed question Tuesday 8/30 1 answer

    o CarGurus I am blown away that you took the time to write back to me about this. It is really quite considerate of you. The question I posed is for my (newly bought, don't have the registration yet...

    2011 GMC Sierra 1500 SLE Crew Cab 4WD

    -

    Maintenance & Repair

  • Transmission cooler question 2 answers

    Looking at a 2012 gmc sierra z71 4x4 sle. It is equipped with a towing package. Does that include a external mounted transmission oil cooler? Thanks...

    2012 GMC Sierra 1500

    -

    General

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,830
#2 John Saffrahn
John Saffrahn
Reputation 3,390
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,990
View All

Related Models For Sale

Used Ford F-150
2,693 Great Deals out of 211,512 listings starting at $1,000
Used Dodge Ram 1500
530 Great Deals out of 12,822 listings starting at $1,995
Used GMC Yukon
516 Great Deals out of 17,124 listings starting at $1,799
Used Toyota Tacoma
616 Great Deals out of 35,102 listings starting at $2,155
Used Chevrolet Tahoe
775 Great Deals out of 28,448 listings starting at $1,500
Used Chevrolet Camaro
282 Great Deals out of 38,308 listings starting at $1,250

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
23 Great Deals out of 35,678 listings starting at $23,699
2016 GMC Sierra 1500 For Sale
54 Great Deals out of 3,970 listings starting at $18,219
2015 GMC Sierra 1500 For Sale
119 Great Deals out of 4,045 listings starting at $14,988
2014 GMC Sierra 1500 For Sale
150 Great Deals out of 4,388 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
89 Great Deals out of 2,375 listings starting at $9,988