Why does my 2001 Cheve Silverado 5.3 L make a knocking sound when started cold and then go away after it runs a minute or if it is driven a minute. The sound seems to come from the bottom of the motor or the tranny area and has been there since i bought the vehicle. It doesn't seem to be getting worse and someone suggested piston slap as the problem. Any ideas ?

Asked by Aug 15, 2013 at 03:27 PM about the 2001 Chevrolet Silverado 1500 LS Extended Cab SB 4WD

Question type: Maintenance & Repair

The fluids are good and the tranny is rebuilt too.

1 Answer

a leaking fuel injector can dump gas....check the oil in your crankcase for evidence of fuel there...examine your injectors for leakage~

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Loud knocking noise 5.3 53 answers

    I have a loud knocking noise coming from the engine . At first I thought it was comin from the top but when i get under it it's alot louder sounds like its comin from the oil pan. I had the transmissi...

    2005 Chevrolet Silverado 1500 Z71 Crew Cab 4WD

    -

    Maintenance & Repair

  • 2004 silverado Z71 flashing check engine light 47 answers

    my check engine light has come on and had started blinking just lately. which means engine misfire. after replacing the plugs and wires the truck seems to have a rough idle and still seems to misfire ...

    2004 Chevrolet Silverado 1500 Z71 Crew Cab Short Bed 4WD

    -

    Maintenance & Repair

  • Engine Shutting off after about 10-20 seconds on 2004 Silverado 1500 54 answers

    Can anyone shed some light on this problem. After driving my 04' Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but...

    2004 Chevrolet Silverado 1500

    -

    Maintenance & Repair

  • hard start when warmed up 99 silverado 5.3 15 answers

    MY SILVERADO PICKUP STARTS GREAT WHEN COLD BUT WILL NOT START WITH OUT CRANKING FOR PROBABLY AROUND 6 SECONDS. SOMETIMES MORE AND SOMETIMES LESS. IT WILL START BACK UP EASILY RIGHT AFTER YOU SHUT IT O...

    1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab SB

    -

    Maintenance & Repair

  • Piston Slap or Engine Knock? 1 answer

    I own a 2007 Chevy Malibu LS 2.2L 4 Cylinder Automatic. When i start the engine while cold, there's a knocking or slapping noise. It only happens when it's cold and as the engine warms up it slowl...

    2007 Chevrolet Malibu LS

    -

    Maintenance & Repair

Search Chevrolet Silverado 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,760
#2 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,490
#3 tenspeed
tenspeed
Reputation 1,420
View All

Related Models For Sale

Used GMC Sierra 1500
1,057 Great Deals out of 58,692 listings starting at $1,599
Used Ford F-150
3,220 Great Deals out of 205,083 listings starting at $1,779
Used Dodge Ram 1500
529 Great Deals out of 13,261 listings starting at $1,800
Used Chevrolet Silverado 2500HD
424 Great Deals out of 26,885 listings starting at $1,500
Used Toyota Tundra
644 Great Deals out of 27,763 listings starting at $3,200
Used Toyota Tacoma
714 Great Deals out of 32,123 listings starting at $2,000
Used Chevrolet Tahoe
851 Great Deals out of 28,365 listings starting at $1,700
Used Chevrolet Camaro
475 Great Deals out of 39,917 listings starting at $3,499
Used Ford F-250 Super Duty
475 Great Deals out of 41,912 listings starting at $1,999
Used Chevrolet Silverado 2500
5 Great Deals out of 286 listings starting at $3,995
Used Chevrolet Silverado 1500HD
20 Great Deals out of 333 listings starting at $3,999
Used Chevrolet Avalanche
254 Great Deals out of 5,913 listings starting at $2,400

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
57 Great Deals out of 84,402 listings starting at $20,000
2016 Chevrolet Silverado 1500 For Sale
294 Great Deals out of 12,362 listings starting at $18,657
2015 Chevrolet Silverado 1500 For Sale
350 Great Deals out of 7,277 listings starting at $14,795
2014 Chevrolet Silverado 1500 For Sale
524 Great Deals out of 11,018 listings starting at $12,888
2013 Chevrolet Silverado 1500 For Sale
299 Great Deals out of 6,347 listings starting at $8,995