time for a new engine

[lousgarage]

Hi I'm new here ,my name is Lou.

My 2001 5.3 engine has 150,000 on it. It knocks badly on start-up after sitting all night, and goes away after a couple of minutes at idle. Before I spend the money on a GM replacement, has GM fixed the problem, or are the newer engines doing the same thing after a few thousand miles

[RaysZ71]

You may have a carbon buildup issue. Mine has 115000 and has done it off and on since 25000.

 

I recommend some BG44K through the fuel system. Should help it.

 

I have yet to hear of a Gen 3 engine fail from what you described.

[MustGoFaster]

carbon buildup. do a top end clean, clean out the TB, and the IAC. then change plugs, wires, and oil. (change oil is a must! but if plugs and wires are fairly new, just leave 'em be)

 

drive on.

 

my 4.8 was knocking on cold start at 70K - did a TEC and most of it went away.

[lousgarage]

You may have a carbon buildup issue.  Mine has 115000 and has done it off and on since 25000.

 

I recommend some BG44K through the fuel system.  Should help it.

 

I have yet to hear of a Gen 3 engine fail from what you described.

 

<{POST_SNAPBACK}>

 

 

thanks for the info,where can I get this BG44K. I'll try it.

[MustGoFaster]

you can use that stuff or seafoam, or berrymans. they'er available pretty much everywhere from wal-mart to auto parts places.