I drive a 03 Chevy Silverado with an 8.1 and I recently discovered a noise coming from the right side of the motor, it's not a ticking it's more of a knocking noise, what could it be?

Asked by Aug 29, 2015 at 10:18 AM about the 2003 Chevrolet Silverado 2500HD 4 Dr LT 4WD Crew Cab LB HD

Question type: Maintenance & Repair

Recently changed oil, no lights or sensors
are on, water pump is leaking though.

6 Answers


It seems like the 8.1 has a piston slap as well as lifter problems, you can research it online, there is quite a bit of information on this.

I did some research and there is so many possibilities, from the piston slap to the camshaft being bad, but my truck runs like a champ with 168000 miles,should I worry about or should I ignore it


If you keep it long enough eventually you will have to do something, I had 6.0 that had piston slap in it, it still had piston slap in it when I sold it, and the guy that bought it said it had piston slap when he sold it. So as long as it doesn't get any worse just drive it but make sure you use a good engine oil.

Aight Thankyou! And valvoline with a quart of Lucas is what I use!


Lucas is what I use in my rigs, sounds like you are doing it right. Good Luck and have many of miles of driving.

You too!

Your Answer

Silverado 2500HD

Looking for a Used Silverado 2500HD in your area?

CarGurus has 29,759 nationwide Silverado 2500HD listings starting at $2,795.


Chevrolet Silverado 2500HD Experts

  • #1
    Steven Loeffler
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used GMC Sierra 2500HD
120 Great Deals out of 13,899 listings starting at $1,500
Used Ford F-250 Super Duty
482 Great Deals out of 47,157 listings starting at $1,817
Used Chevrolet Silverado 1500
2,926 Great Deals out of 161,759 listings starting at $1,295
Used Dodge Ram 2500
155 Great Deals out of 5,445 listings starting at $2,995
Used GMC Sierra 1500
1,233 Great Deals out of 63,047 listings starting at $1,200
Used Ford F-150
3,205 Great Deals out of 226,346 listings starting at $1,250
Used Ford F-350 Super Duty
376 Great Deals out of 26,348 listings starting at $2,500
Used Chevrolet Silverado 2500
7 Great Deals out of 236 listings starting at $3,000
Used Toyota Tundra
712 Great Deals out of 34,575 listings starting at $1,500

Used Cars For Sale

2018 Chevrolet Silverado 2500HD For Sale
14,688 listings starting at $26,811
2017 Chevrolet Silverado 2500HD For Sale
6 Great Deals out of 2,244 listings starting at $27,729
2016 Chevrolet Silverado 2500HD For Sale
24 Great Deals out of 1,863 listings starting at $23,566
2015 Chevrolet Silverado 2500HD For Sale
92 Great Deals out of 2,520 listings starting at $13,488
2014 Chevrolet Silverado 2500HD For Sale
30 Great Deals out of 713 listings starting at $15,995

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.