I have my 4.8is and noticed for the past year that while cold the truck has an engine tick/knock which goes away when warmed up. But, it is not rhythmic but constant. It does not go up when I rev the motor, even while cold. Only at idle. 92k miles.
I changed oil to 5-40 Castrol, no change
Plugs appear to be original so I ordered a set of NGK 6441 plugs.
Noise is still present when I shift from P to other gears. Weird.
I removed both serpentine belts to see if it was accessory related. Nope. Still there.
Could it be the dreaded Intermediate levers? How can I check those with INPA software?
Runs great, no codes. Very smooth.
Gas mileage is a bit lower these days at 14mpg mixed, I swear it was higher a year back or so.
I tried stethoscope method, cannot isolate it.
Thanks,
