Valve knock?

[jlb0716]

Ok so when I'm accelerating at low rpms the motor has a very distinct knocking/rattling sound. I think it is valve knock but I'm not sure. Could it be due to the timing being off? What can I do to fix this noise. And could the lean condition in my engine be contributing to this?

 

[Beanmachine7000]

Sounds like detonation... Downshift...

 

[jlb0716]

It just recently started making this noise.I've owned this truck since '03 and never had this issue...something isn't right...i know it isn't my driving.

 

[Beanmachine7000]

99% sure it is detonation... Low RPM's/high load, usually means detonation, doesn't matter if it just started it or not... You might have gotten a bad batch of gas or some excess carbon build up... DOWNSHIFT Run a can of Seafoam through it if you feel like you need to do something about it...

 

[jlb0716]

fixed this situation by making a modification to my intake and reincorporating the stock MAF adapter back in line with the system.