Ticking sound Piston Slap?? HELP!!!

[~Firehawk~]

A few weeks ago I noticed my truck started making a ticking sound that sounds like an exhaust leak. First think I did was change my oil and when that didnt cure it I put in lucas oil and when that didnt help I replaced the exhaust manifold gaskets but that did not fix the problem either. Then I took it to a gm dealer and after 2 days of diagnosis they tell me its piston slap. Now I know the 5.3L engines problem with the undersized pistons and all but to me the piston slap always sounded like marbles in the engine and not like a ticking sound you would get from an exhaust leak or bad lifter.

Also I should mention that the sound can hardly be heard from on top of the engine. Instead the best place it can be heard is under the engine when I stick my head right behind the driver side wheel. But its loud enough that I hear it echoing off the cars parked on the side of the road when I drive down the street. The ticking cant really be heard at idle but instead hear best just above idle &from 750 to about 1300 RPMS

so I have (2) questions

1- can this really be piston slap making a ticking sound?

2- if its not piston slap what can it be? The kicker here is it cant really be heard from on top of the engine.

this is 2001 Silverado 5.3 with 71K on it.

 

Can anyone please help? Im out of ideas

[OnyxMAX]

if it didn't sound that way for 71k then prolly not, if you just bought it then it prolly is. mine sounds like a disiel when i pull up to a atm or something, my LS1 did to

[Nappers]

My Yukon with 5.3 2WD HAD piston slap, I run 5/30 Mobil Synthetic and it went away. Purrs like a kitten now and with 104,000 miles on the clock

[tasturbo86]

Piston slap usually appears pretty early in the life of the engine and will quiet down after a few minutes of running.

There was a TSB a few years ago about an 'O ring' near the oil pump that could be bad. It would a clicking sound, I believe from the lifters.

Might check it out. Sorry, I do not have the exact TSB.

 

terry

[ckes]

A few weeks ago I noticed my truck started making a ticking sound that sounds like an exhaust leak.  First think I did was change my oil and when that didnt cure it I put in lucas oil and when that didnt help I replaced the exhaust manifold gaskets  but that did not fix the problem either.  Then I took it to a gm dealer and after 2 days of diagnosis they tell me its piston slap.  Now I know the 5.3L engines problem with the undersized pistons and all but to me the piston slap always sounded like marbles in the engine and not like a ticking sound you would get from an exhaust leak or bad lifter.

Also I should mention that the sound can hardly be heard from on top of the engine.  Instead the best place it can be heard is under the engine when I stick my head right behind the driver side wheel.  But its loud enough that I hear it echoing off the cars parked on the side of the road when I drive down the street.  The ticking cant really be heard at idle but instead hear best just above idle &from 750 to about 1300 RPMS

so I have (2) questions 

1-  can this really be piston slap making a ticking sound?

2-  if its not piston slap what can it be?  The kicker here is it cant really be heard from on top of the engine.

this is 2001 Silverado 5.3 with 71K on it.

 

Can anyone please help?  Im out of ideas

 

<{POST_SNAPBACK}>

 

 

 

Check to see if it the fuel rails on the top of the motor my 5.3 makes a lot of ticking when started and will stop after awile of running mine got lounder after i put an air intake and a flowmaster on it but i whent to a couple deelers and listned to a couple other trucks and i noticed that they made the ticking to BUT the newer trucks have an insalator over the feul rails