'06 Silverado

[5.3silverado]

I went and test drove a 06 silverado 1500 with 5.3 and it sounds different at idle versus my 2004 Silverado 1500 5.3. Did they change anything on newer motors?

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[Bigredmariner]

No, motor in the 06 should be the same as your 04. What sounds funny to you?

 

[5.3silverado]

The injectors sounded different. Maybe because it was really cold outside.

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[Draenor]

Just 'cause its a newer model doesn't make it better. Depends on how it was cared for. Those injectors could be dirty and need a cleaning. A rough idle would be an indicator.

 

[Bigredmariner]

My 06 has had a lot of valve train noise and piston slap when it's cold. After everything has warmed up thoroughly it pretty much goes away. Never has used oil since the day I got it. There is ZERO wear in the cylinder walls at 125K miles. Not sure how the bearings look but I would assume they would look good too.

How many miles on the truck you're looking at?

 

[Bigredmariner]

Just 'cause its a newer model doesn't make it better. Depends on how it was cared for. Those injectors could be dirty and need a cleaning. A rough idle would be an indicator.

Yes, if it is stumbling while idling, beware.

 

[5.3silverado]

No run smooth just sounded different. Not knocking or anything. Truck has 110000 miles on it.

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[NMRam]

Some of the 05+ trucks were aluminum block...my 05 had the aluminum block and it sounded different than the 04 work truck with the iron.

 

[txab]

Electric vs mechanical cooling fan?

 

[Bigredmariner]

Electric vs mechanical cooling fan?

That could be the difference. The 06 should have electric fans, so I would think the engine would sound noisier? Because all you are hearing is engine, no fan noise masking it?