F250 engine chatter

[shepherd]

I have 2001 F250 with V8 and 5 sp. Between 2000 and 2400 rpm I get an engine chatter at normal operating temp and it is more noticeble under heavy load and taller gears. You dont hear it if coasting through this RPM range. All the exhaust componets have been checked and no manifold leaks apparent. Heard this motor has forged pistons. Could that do this?

[DanD]

I posted on the other site before I saw this one.

It may be engine ping or detonation, what grade of fuel are you using?
If it is pinging or detonating you may have excessive carbon built up in the combustion camber, have the engine decarbonized. It wouldn’t hurt even if it’s not the problem.
If the EGR valve is not functioning properly or the passageways are partially plugged it will cause an engine ping. The exhaust gases cool the combustion chamber.
I know what you’re thinking, how can hot exhaust cool when it’s 3 to 4 hundred degrees, combustion temperatures are 2 to 3 thousand degree and the exhaust doesn’t add anything to the combustion, all the fuel and oxygen has already been burnt, it just takes up space.
Dan.

[way2old]

To add to Dan's post, have the MAF checked also. If it is reading the wrong airflow, it will cause the engine to run too lean and cause a rattling noise. Can you get scan tool readings for the vehicle and post them? Pay attention to the baro and LTFT readings.